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Infinity-Corrected Tube Lenses


  • For use with Infinity-Corrected Objectives
  • 200 mm Focal Length Common in Thorlabs, Nikon, and Leica Microscopes
  • Designs for Widefield and Laser Scanning Applications

TL200-2P2

Optimized for Laser Scanning from 680 to 1600 nm

TTL200

Optimized for Widefield Imaging from 400 to 750 nm

TL200-3P

Optimized for Laser Scanning from 900 to 1900 nm

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info icon Zemax blackbox files for the TTL200 (both directions) can be accessed by clicking this icon below.

Features

  • Diffraction-Limited, Modular Tube Lenses
  • TTL200 and ITL200: Designed as Drop-In Replacements for Microscopes using 200 mm Effective Focal Length Tube Lenses
  • TL200-CLS2, TL200-2P2, and TL200-3P: Tube Lenses Optimized for Laser Scanning Applications

These infinity-corrected tube lenses are designed for use with any infinity-corrected objective, such as Nikon and Mitutoyo DryOil Immersion, and Physiology microscope objectives. The lenses have an effective focal length of 200 mm and options are available for high-resolution imaging, biomedical, machine vision, and laser scanning applications. They can be easily integrated into DIY Cerna Microscopes and other home-built microscopy setups, used as drop-in replacements for tube lenses in existing microscope systems, aligned in pairs to create 1 to 1 relays, or combined with Thorlabs' standard optomechanics to build setups that generate high-quality images.

Standard Widefield Tube Lenses
The TTL200 Tube Lens is specifically designed to offer a wider diffraction-limited axial color range compared to the ITL200 tube lens. In particular, axial color performance was improved at shorter wavelengths (<480 nm) to accommodate applications using 405 nm and 443 nm illumination. Both the TTL200 and ITL200 are AR coated for visible wavelengths and a transmission plot is provided to the lower right. The TTL200 lens can also be custom coated with either a single layer or a multi-layer coating optimized for transmission over a user-specified wavelength range; contact Tech Support for details. Specifications for both lenses can be found on the Specs tab, as well as Zemax black box files for the TTL200.

Laser Scanning Microscopy Tube Lenses
The TL200-CLS2, TL200-2P2, and TL200-3P tube lenses are optimized for laser scanning applications, such as confocal laser scanning, two-photon microscopy, and three-photon microscopy. These lenses are designed to be telecentric when paired with our SL50-CLS2, SL50-2P2, and SL50-3P scan lenses, respectively, for use in point by point galvo scanning of the object plane.

Both the ITL200 and TTL200 tube lenses can also be used in scanning microscopy configurations. For example, they can be paired with the CLS-SL Visible Scan Lens. Please note that using a standard tube lens in a scanning configuration will limit the unvignetted field size, since the tube lens must be placed at the telecentric pupil distance relative to the objective (250 mm for TTL200).

Microscope and Objective Compatibility
Microscope manufacturers design their systems with one of several standard tube lens focal lengths, including 200 mm (typical for Thorlabs, Nikon, and Leica microscopes), 180 mm (typical for Olympus microscopes), and 165 mm (typical for Zeiss microscopes). In addition to being used in home-built microscope systems, these tube lenses can serve as drop-in replacements in many microscopes that use 200 mm focal length tube lenses.

Similarly, microscope objectives are designed to provide the magnification engraved on the housing when they are used with a tube lens of a specific focal length. The objectives that Thorlabs offers from Nikon and Mitutoyo are all designed to work with 200 mm focal length tube lenses, making them directly compatible with the TTL200 and ITL200. The objectives that we offer from Olympus can also be used with the TTL200 or ITL200, but will produce a different magnification than the number engraved on the housing, as they are designed for a 180 mm tube lens focal length. To calculate the system magnification for different tube lens and objective combinations, see the Magnification & FOV tab.

Item # TTL200 ITL200
Effective Focal Length 200 mm ± 1% 200 mm
Working Distancea 148 mm 148 mm
Pupil Distanceb 70 - 170 mm 70 - 170 mm
Field Size Ø22 mmc Not Available
Clear Aperture Ø20 mm Not Available
Lens Design Apochromatic Apochromatic
Operating Wavelength Range 400 to 750 nm Visible Wavelengths
AR Coating Ravg < 0.5% per Surface
(350 - 700 nm, 0° AOI)
Visible Wavelengths
Axial Color Diffraction Limited (See Graphs Tab) Not Available
Resolution Diffraction Limitedd Not Available
Surface Quality 60-40 Scratch-Dig Not Available
Zemax Black Box Files Forward
Backward
Not Available
  • Measured from the housing edge to the image plane (see the diagram below).
  • This is the optimal distance between the lens and the objective.
  • This field size is large enough to fill a 4/3" format camera sensor.
  • Appropriate for use with camera pixel sizes down to 2 µm.
Tube Lens Schematic
Click To Enlarge

*For Best Performance
The tube lens schematic above shows the working distance and pupil distance for the TTL200 and ITL200 tube lenses. The working distance corresponds to the distance from the top surface of the housing in the image to the image plane. Pupil distance, defined as the distance between the bottom edge of the tube lens housing and the top surface of the objective housing (not including the threads), can be set anywhere from 70 to 170 mm while still obtaining the specified performance from each tube lens.

Item # TL200-CLS2 TL200-2P2 TL200-3P
Operating Wavelength Range
(See Graphs Tab for Transmission Plot)
450 - 1100 nm 680 - 1600 nm 900 - 1900 nm
Effective Focal Length 200 mm 200 mm 200 mm
Working Distancea 180.9 mm 180.9 mm 180.9 mm
Pupil Distanceb 189.1 mm (Telecentric) +24/-5 mm  189.1 mm (Telecentric) +24/-5 mm 189.1 mm (Telecentric) +24/-5 mm
Exit Pupil Diameter 20 mm (Maximum) 20 mm (Maximum) 20 mm (Maximum)
f/# 10 10 10
Field of View
(Diffraction Limited)
16.3 mm x 16.3 mm (FN23) for 656.3 - 1100 nm
14.1 mm x 14.1 mm (FN20) at  587.6 nm
7.8 mm x 7.8 mm (FN11) at 486.1 nm
15.5 mm x 15.5 mm (FN22) for 680 - 1600 nm 15.5 mm x 15.5 mm (FN22) for 900 - 1600 nm
12.4 mm x 12.4 mm (FN17.6) at 1900 nm
Clear Aperture Ø47.0 mm Ø47.0 mm Ø47.0 mm
Lens Design Apochromatic Apochromatic Apochromatic
Axial Color Diffraction Limited (See Graphs Tab) Diffraction Limited (See Graphs Tab) Diffraction Limited (See Graphs Tab)
F-Theta Distortion <0.3% <0.3% <0.3%
Field Curvature <500 µm <500 µm <700 µm
  • Measured from the housing edge to the intermediate image plane (see the diagram below).
  • This is the optimal distance between the lens and the objective.
Scan and Tube Lens Integration
Click to Enlarge

The tube and scan lens schematic above shows the TL200-2P2 tube lens and SL50-2P2 scan lens. It indicates the working distance and pupil distance for the tube lens, as well as the location of the scan lens and the scan plane. Most of these values also apply for the TL200-CLS2 and TL200-3P with their corresponding scan lenses. Note that for the SL50-CLS2 the entrance pupil at the scan plane is a maximum of Ø4 mm and the pupil distance tolerance of the scan lens is +12/-5 mm for the TL200-CLS2.

TTL200 Performance Graphs

Tube Lens Transmission
Click To Enlarge

Click Here for Data
Typical transmission of the TTL200 tube lens. The blue-shaded region corresponds to the specified operating wavelength range of the lens.
Tube Lens Transmission
Click To Enlarge

Click Here for Data
Axial color describes the shift in the focal length across the operating wavelength range of the lens. This graph represents measured data for on-axis rays (0° AOI) focused by a randomly sampled TTL200. The TTL200 falls within the range of diffraction-limited performance, indicated by the shaded pink box. The lens will perform similarly for off-axis rays over the field of view.
RMS Wavefront Error
Click To Enlarge
 
Click Here for Data
The RMS wavefront error was measured for a randomly sampled TTL200 tube lens over the acceptance angle range. The dashed line represents the diffraction-limited performance, while the red curve is the theoretical performance calculated for this lens design. The bottom X axis gives the entrance angle of the incident light. The top X axis is labeled with the calculated location on the image plane where those rays are focused.
Modulation Transfer Function
Click To Enlarge

Click Here for Data
The modulation transfer function of a lens, shown in this graph for the TTL200, is a measure of image quality. The curve represents the contrast of an imaged sinusoidal line pair target with various line spacings. As the contrast diminishes, the distinction between the lines begins to blur. In the graph above, the Y axis represents the contrast and the X axis is the line spacing in lines/mm. This data shown in the plot above and provided in the linked Excel file is a theoretical calculation for the TTL200 lens. The labels on the black lines at 25, 50, and 100 line pairs per millimeter represent the largest camera pixel size that can resolve line pairs at that spacing, assuming that the width of each line is sampled by two camera pixels.

ITL200 Performance Graph

Tube Lens Transmission
Click To Enlarge

Click Here for Data
Typical Transmission of the TTL200 Tube Lens

TL200-CLS2 Performance Graphs

Tube Lens Transmission
Click To Enlarge

Click Here for Data
Typical transmission of the TL200-CLS2 tube lens. The blue-shaded region corresponds to the specified operating wavelength range of the lens.
Tube Lens Transmission
Click To Enlarge

Click Here for Data
Axial color describes the shift in the focal length across the operating wavelength range of the lens. This graph represents theoretical data for on-axis rays (0° AOI) focused by a TL200-CLS2. The TL200-CLS2 falls within the range of diffraction-limited performance, indicated by the shaded pink box. The lens will perform similarly for off-axis rays over the field of view.
RMS Wavefront Error
Click To Enlarge

Click Here for Data
The theoretical RMS wavefront error for the TL200-CLS2 tube lens over the acceptance angle range. The dashed line represents the diffraction-limited performance. The bottom X axis gives the entrance angle of the incident light. The top X axis is labeled with the calculated location on the image plane where those rays are focused.
Modulation Transfer Function
Click To Enlarge

Click Here for Data
The modulation transfer function of a lens, shown in this graph for the TL200-CLS2, is a measure of image quality. The curve represents the contrast of an imaged sinusoidal line pair target with various line spacings. As the contrast diminishes, the distinction between the lines begins to blur. In the graph above, the Y axis represents the contrast and the X axis is the line spacing in lines/mm. This data shown in the plot above and provided in the linked Excel file is a theoretical calculation for the TL200-CLS2 lens.

TL200-2P2 Performance Graphs

Tube Lens Transmission
Click To Enlarge

Click Here for Data
Typical transmission of the TL200-2P2 tube lens. The blue-shaded region corresponds to the specified operating wavelength range of the lens.
Tube Lens Transmission
Click To Enlarge

Click Here for Data
Axial color describes the shift in the focal length across the operating wavelength range of the lens. This graph represents theoretical data for on-axis rays (0° AOI) focused by a TL200-2P2. The TL200-2P2 falls within the range of diffraction-limited performance, indicated by the shaded pink box. The lens will perform similarly for off-axis rays over the field of view.
RMS Wavefront Error
Click To Enlarge

Click Here for Data
The theoretical RMS wavefront error for the TL200-2P2 tube lens over the acceptance angle range. The dashed line represents the diffraction-limited performance. The bottom X axis gives the entrance angle of the incident light. The top X axis is labeled with the calculated location on the image plane where those rays are focused.
Modulation Transfer Function
Click To Enlarge
Click Here for Data
The modulation transfer function of a lens, shown in this graph for the TL200-2P2, is a measure of image quality. The curve represents the contrast of an imaged sinusoidal line pair target with various line spacings. As the contrast diminishes, the distinction between the lines begins to blur. In the graph above, the Y axis represents the contrast and the X axis is the line spacing in lines/mm. This data shown in the plot above and provided in the linked Excel file is a theoretical calculation for the TL200-2P2 lens.

TL200-3P Performance Graphs

Tube Lens Transmission
Click To Enlarge

Click Here for Data
Typical transmission of the TL200-3P tube lens. The blue-shaded region corresponds to the specified operating wavelength range of the lens.
Tube Lens Transmission
Click To Enlarge

Click Here for Data
Axial color describes the shift in the focal length across the operating wavelength range of the lens. This graph represents theoretical data for on-axis rays (0° AOI) focused by a TL200-3P. The TL200-3P falls within the range of diffraction-limited performance, indicated by the shaded pink box. The lens will perform similarly for off-axis rays over the field of view.
RMS Wavefront Error
Click To Enlarge

Click Here for Data
The theoretical RMS wavefront error for the TL200-3P tube lens over the acceptance angle range. The dashed line represents the diffraction-limited performance. The bottom X axis gives the entrance angle of the incident light. The top X axis is labeled with the calculated location on the image plane where those rays are focused.
Modulation Transfer Function
Click To Enlarge
Click Here for Data
The modulation transfer function of a lens, shown in this graph for the TL200-3P, is a measure of image quality. The curve represents the contrast of an imaged sinusoidal line pair target with various line spacings. As the contrast diminishes, the distinction between the lines begins to blur. In the graph above, the Y axis represents the contrast and the X axis is the line spacing in lines/mm. This data shown in the plot above and provided in the linked Excel file is a theoretical calculation for the TL200-3P lens.
Widefield Viewing Optical Path
When viewing an image with a camera, the system magnification is the product of the objective and camera tube magnifications. When viewing an image with trinoculars, the system magnification is the product of the objective and eyepiece magnifications.
Magnification & FOV Calculator
Manufacturer Tube Lens
Focal Length
Leica f = 200 mm
Mitutoyo f = 200 mm
Nikon f = 200 mm
Olympus f = 180 mm
Thorlabs f = 200 mm
Zeiss f = 165 mm

The rows highlighted in green denote manufacturers that do not use f = 200 mm tube lenses.

Magnification and Sample Area Calculations

Magnification

The magnification of a system is the multiplicative product of the magnification of each optical element in the system. Optical elements that produce magnification include objectives, camera tubes, and trinocular eyepieces, as shown in the drawing to the right. It is important to note that the magnification quoted in these products' specifications is usually only valid when all optical elements are made by the same manufacturer. If this is not the case, then the magnification of the system can still be calculated, but an effective objective magnification should be calculated first, as described below.

To adapt the examples shown here to your own microscope, please use our Magnification and FOV Calculator, available for download by clicking on the red button above.

Example 1: Camera Magnification
When imaging a sample with a camera, the image is magnified by the objective and the camera tube. If using a 20X Nikon objective and a 0.75X Nikon camera tube, then the image at the camera has 20X × 0.75X = 15X magnification.

Example 2: Trinocular Magnification
When imaging a sample through trinoculars, the image is magnified by the objective and the eyepieces in the trinoculars. If using a 20X Nikon objective and Nikon trinoculars with 10X eyepieces, then the image at the eyepieces has 20X × 10X = 200X magnification. Note that the image at the eyepieces does not pass through the camera tube, as shown by the drawing to the right.

Using an Objective with a Microscope from a Different Manufacturer

Magnification is not a fundamental value: it is a derived value, calculated by assuming a specific tube lens focal length. Each microscope manufacturer has adopted a different focal length for their tube lens, as shown by the table to the right. Hence, when combining optical elements from different manufacturers, it is necessary to calculate an effective magnification for the objective, which is then used to calculate the magnification of the system.

The effective magnification of an objective is given by Equation 1:

Equation 1 (Eq. 1)

Here, the Design Magnification is the magnification printed on the objective, fTube Lens in Microscope is the focal length of the tube lens in the microscope you are using, and fDesign Tube Lens of Objective is the tube lens focal length that the objective manufacturer used to calculate the Design Magnification. These focal lengths are given by the table to the right.

Note that Leica, Mitutoyo, Nikon, and Thorlabs use the same tube lens focal length; if combining elements from any of these manufacturers, no conversion is needed. Once the effective objective magnification is calculated, the magnification of the system can be calculated as before.

Example 3: Trinocular Magnification (Different Manufacturers)
When imaging a sample through trinoculars, the image is magnified by the objective and the eyepieces in the trinoculars. This example will use a 20X Olympus objective and Nikon trinoculars with 10X eyepieces.

Following Equation 1 and the table to the right, we calculate the effective magnification of an Olympus objective in a Nikon microscope:

Equation 2

The effective magnification of the Olympus objective is 22.2X and the trinoculars have 10X eyepieces, so the image at the eyepieces has 22.2X × 10X = 222X magnification.


Image Area on Camera

Sample Area When Imaged on a Camera

When imaging a sample with a camera, the dimensions of the sample area are determined by the dimensions of the camera sensor and the system magnification, as shown by Equation 2.

Equation 5 (Eq. 2)

The camera sensor dimensions can be obtained from the manufacturer, while the system magnification is the multiplicative product of the objective magnification and the camera tube magnification (see Example 1). If needed, the objective magnification can be adjusted as shown in Example 3.

As the magnification increases, the resolution improves, but the field of view also decreases. The dependence of the field of view on magnification is shown in the schematic to the right.

Example 4: Sample Area
The dimensions of the camera sensor in Thorlabs' 1501M-USB Scientific Camera are 8.98 mm × 6.71 mm. If this camera is used with the Nikon objective and trinoculars from Example 1, which have a system magnification of 15X, then the image area is:

Equation 6

Sample Area Examples

The images of a mouse kidney below were all acquired using the same objective and the same camera. However, the camera tubes used were different. Read from left to right, they demonstrate that decreasing the camera tube magnification enlarges the field of view at the expense of the size of the details in the image.

Image with 1X Camera Tube
Click to Enlarge

Acquired with 1X Camera Tube (Item # WFA4100)
Image with 1X Camera Tube
Click to Enlarge

Acquired with 0.75X Camera Tube (Item # WFA4101)
Image with 1X Camera Tube
Click to Enlarge

Acquired with 0.5X Camera Tube (Item # WFA4102)

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Posted Comments:
Poster:hsieh-fu.tsai
Posted Date:2016-12-08 23:50:45.78
I am interested to build an microscope with this tube lens. However, I wonder how mounting can be done to connect the tube lens to a c-mount camera? Thank you.
Poster:y.tian
Posted Date:2016-10-11 05:29:18.583
Hello, If I can also use ITL200 in an IR system. Because TL200 2P2 is too expensive that already beyond the budget. What makes such huge price difference?Thanks.
Poster:jlow
Posted Date:2016-10-21 04:24:11.0
Response from Jeremy at Thorlabs: The TL200-2P2 has been optimized for scanning application and it is designed for a wider wavelength range than the ITL200. While it can work for some scanning applications (e.g. if your scan angle is small), it’s not ideal solution. I will contact you directly to discuss further about this
Poster:xliay
Posted Date:2016-09-27 13:13:22.31
Nowadays we are using LSM04-BB as the scan lens and AC508-250-B as the tube lens combination. However, in our stimulated Raman scattering (SRS) microscopy, we found that the Pump beam (780~960 nm) was not perfectly overlapped with the Stokes beam (1031 nm) when the scanning field of view is larger than 60 um using 40X objective. This phenomenon is possibly introduced by the lateral chromatic aberration of our scan relay system because we observed that the FOV is better when using 900 nm than 800 nm. So are there any recommendations of NIR scan relay system from Thorlabs to meet our requirement?
Poster:jlow
Posted Date:2016-10-03 05:08:20.0
Response from Jeremy at Thorlabs: I will contact you directly to discuss about this.
Poster:andreas.groeschl
Posted Date:2016-06-06 14:15:41.05
Dear ladies and gentleman, may question is, why is the Working Distance much less than the focal lenght? Best regards Andreas
Poster:besembeson
Posted Date:2016-06-08 09:23:25.0
Response from Bweh at Thorlabs USA: The focal length is relative to a principal plane of the actual lens element which is inside the housing while the working distance is relative to the external housing edge.
Poster:ludoangot
Posted Date:2016-03-17 14:00:38.693
I also need the ITL200 front focal length, has Nikon provided this information? If not, would it be possible you measure it? Ideally a tick lens model of the ITL200 would be much welcome.
Poster:besembeson
Posted Date:2016-03-17 02:59:42.0
Response from Bweh at Thorlabs USA: Unfortunately Nikon doesn't provide this information.
Poster:jesmondhong
Posted Date:2016-03-11 03:32:34.817
Hi, if i have a lens attached to the camera sensor, should I keep a 148mm from the end of the ITL200 to the front mount of the lens attached to the camera?
Poster:besembeson
Posted Date:2016-03-11 11:20:51.0
Response from Bweh at Thorlabs USA: The ITL200 is your imaging lens so the 148mm should be to the camera sensor. If you have an additional relay lens (which is not typical), then that distance should correspond to the object plane of your relay lens.
Poster:pedroalves.dct
Posted Date:2016-02-19 09:33:28.01
Hello, my purpose is photography. My setup: - Olympus OMd-Em5II camera; - Mitutoyo Mplan 5 and 10x lens. Between the lens and the camera I've an iris diaphragm (from thorlabs) and a raynox dcr250 as tube lens. Between the raynox and the camera I've a extension bellows at 100mm. Well, I'm not happy with the setup and I would like to try the ITL200 instead of the raynox. I need some advices about the distances between the mitutoyo and the ITL200 and the ITL and the camera sensor? Many thanks in advance. Sincerely, Pedro Alves
Poster:besembeson
Posted Date:2016-03-03 04:05:05.0
Response from Bweh at Thorlabs USA: The camera sensor should be about 148mm from the end of the ITL200 and the front of the ITL200 can be between 70-170mm from the end of the objective.
Poster:besembeson
Posted Date:2016-03-03 04:05:05.0
Response from Bweh at Thorlabs USA: The camera sensor should be about 148mm from the end of the ITL200 and the front of the ITL200 can be between 70-170mm from the end of the objective.
Poster:gtn75
Posted Date:2015-11-19 19:55:17.567
I want to know where are the principal planes of the ITL200.
Poster:besembeson
Posted Date:2015-11-20 02:30:45.0
Response from Bweh at Thorlabs USA: The back focal length is 148mm. We don't have information on the front focal length. I will contact you if Nikon can provide this.
Poster:jghimcm
Posted Date:2015-10-27 14:30:16.873
Can this tube lens used with a Leica Infinity-corrected objective? Thanks!
Poster:besembeson
Posted Date:2015-11-05 10:19:41.0
Response from Shawn at Thorlabs China: It depends on your application. If it involves a monochromatic source, then it should be okay but it may not be very suitable if you have to account for chromatic aberration. This is because Leica (and Zeiss) microscopes have color correction inside their tube lens. They don't correct for chromatic aberrations in the objective. Nikon (and Olympus) have color correction in the their microscope objectives, not in the tube lens.
Poster:a.bruni
Posted Date:2015-04-14 08:59:22.95
dear All, I need a thecnical contact to explane my castom problem. Andrea
Poster:jlow
Posted Date:2015-04-15 04:03:15.0
Response from Jeremy at Thorlabs: You can contact us at techsupport@thorlabs.com to discuss about your application.
Poster:
Posted Date:2015-01-29 19:02:32.153
The focal length is 148mm from the mounting side, what is it from the other side?
Poster:jlow
Posted Date:2015-01-29 02:13:12.0
Response from Jeremy at Thorlabs: The orientation, distances, and dimension of the tube lens are located in the drawing under "Specs" tab. I am not sure I fully understand your question. Since you did not leave any contact information, can you contact us at techsupport@thorlabs.com to discuss about this further please?
Poster:
Posted Date:2015-01-05 11:30:45.733
Could you please specify the focal length tolerance on this lens system?
Poster:cdaly
Posted Date:2015-01-09 01:37:27.0
Response from Chris at Thorlabs: The specified tolerance is +/-1%, but it is realistic to expect it to be closer to +/-0.5%.
Poster:ieivanov
Posted Date:2014-07-29 19:00:57.11
You should offer a 2 inch lens tube with internal SM2 threads on one end and set screws for attaching a C-mount on the other end. The lens tube should be the appropriate length, such that when used with the ITL200 lens and the SM2A20 adapter, the sensor of a camera mounted at the C-mount would be the correct focal distance away from the ITL200 lens.
Poster:cdaly
Posted Date:2014-08-07 02:53:02.0
Response from Chris at Thorlabs: Thank you for your suggestion. We will discuss the idea internally and it may be something you see offered as a standard product in the future. We welcome any product ideas which you think would serve to help make our products more useful in your applications.
Poster:ikky.shura
Posted Date:2014-06-25 19:07:09.623
Hi, I purchased this ITL200 lens and it seems to me that the front focal length is more like 250mm by trying to image an obect located at > 10x the measured focal lens (assumed to be infinity). I need to know where is the front focal plane for my experiment and since no zemax file is given it's hard to be convinced. Is this lens being tested by Thorlabs? Has anyone else seen this? Thanks,
Poster:jlow
Posted Date:2014-07-21 02:29:59.0
Response from Jeremy at Thorlabs: The effective focal length of the lens is 200mm and its back focal length is 148mm from the mounting side (smaller aperture side). It will probably be better to measure this with sun light instead.
Poster:yangbin
Posted Date:2014-05-21 10:21:08.717
我是深圳华大基因研究院的光学工程师杨斌,我们想购买型号为ITL200的这个筒镜配合20X的显微镜使用,但我们这个系统总的放大倍数为21.6,不知你们能够告诉在这个倍数时显微物镜与筒镜的距离是多少,或给出筒镜的光学结构参数或Zemax文档让我们自行模拟这个距离,非常感谢。
Poster:besembeson
Posted Date:2014-05-22 09:45:20.0
A response from Bweh Esembeson at Thorlabs USA: Thanks for contacting Thorlabs. Unfortunately we don’t have the Zemax file for this tube lens at this time. If your objective is infinity corrected, then you can calculate the magnification with the tube lens from the ratio of the focal length of the tube lens and that of the objective. The distance between the tube lens and objective can be adjusted (70mm - 170mm for the ITL200) so that all the off-axis rays from object can be brought to the image plane. I will contact you through our China office to know the properties of your objective and help determine the magnification.
Poster:pearu.peterson
Posted Date:2014-05-15 14:13:54.85
SM2AD36 is exactly what I was looking for! Strangely, this component is not listed in the table of adapters, therefore, I could not find it. But thanks for the hint! Pearu
Poster:besembeson
Posted Date:2014-05-15 02:38:28.0
Response from Bweh E at Thorlabs. Thanks for the feedback. The adapter selection guide is a new feature and we are continuously improving this. Based on your comment, we will look into creating more linkage between these products.
Poster:pearu.peterson
Posted Date:2014-05-15 12:23:39.65
Hi, I have 36mm diameter lens (original Nikon back port tube lens) and I wonder if you could provide a tube or any system where to attach such a lens? ITL200 seems to be about the same size (might be too small). Could it fit a 36mm diameter lens? Best regards, Pearu
Poster:besembeson
Posted Date:2014-05-15 11:12:18.0
A Response from Bweh E at Thorlabs in Newton: Thanks for contacting Thorlabs. The ITL200 has an M38x0.5 threaded port which can accommodate the 36mm diameter lens but I am not sure how the thickness of your lens compares with the available space on the ITL200 housing. Besides, we don’t have M38x0.5 retaining rings at this time. We will look into having these as a stock item subsequently. One combination that could possible work for you depending on the thickness of your lens will be the SM2AD36 (http://www.thorlabs.com/thorproduct.cfm?partnumber=SM2AD36) in conjunction with the SM2A20 (http://www.thorlabs.com/thorproduct.cfm?partnumber=SM2A20).
Poster:stefano.zoia
Posted Date:2013-09-09 11:46:57.343
Is this tube lens ITL200 compatible with the Olympus Plan Fluorite objectives? Or, do you have a better solution for these lenses? Thanks
Poster:cdaly
Posted Date:2013-09-12 14:15:00.0
Response from Chris at Thorlabs: Thank you for using our feedback tool. The Olympus objectives are typically intended to be used with a tube lens with a focal length of 180mm. There's not really any particular reason that one cannot be used with a different focal length such as the 200mm ITL200, but it should be noted that the magnification will increase by a factor of 200/180 (10/9).
Poster:sdewald
Posted Date:2013-02-18 12:15:19.857
I need the prescription of the ITL200 tube lens to incorporate it into our system. A .zmx file, please.
Poster:cdaly
Posted Date:2013-02-20 20:23:00.0
Response from Chris at Thorlabs: Thank you for using our web feedback. We will contact you directly about the ITL200.
Poster:tcohen
Posted Date:2012-10-18 12:05:00.0
Response from Tim at Thorlabs to Reto: This is a Nikon tube lens offered for users to be able to design complete microscope systems from our standard components.
Poster:fiolkar
Posted Date:2012-10-15 12:35:45.687
To whom it may concern: Is the ITL200 a tubelens manufactured by Nikkon or is it a Thorlabs design? Best, Reto
Poster:jlow
Posted Date:2012-09-13 10:25:00.0
Response from Jeremy at Thorlabs: The entrance aperture is about 30mm and the exit aperture is about 23.9mm.
Poster:ZENJOE.GREEN
Posted Date:2012-09-06 13:31:06.0
What is the aperature size of the ITL200 tube lens?
Poster:jlow
Posted Date:2012-08-15 15:47:00.0
Response from Jeremy at Thorlabs: The distance between the objective shoulder and the housing of the tube lens should be around 70mm to 170mm for best performance. This distance is also called out in the diagram under the Overview tab.
Poster:
Posted Date:2012-08-14 19:31:26.0
What is the optimal distance between ITL200 and a Nikon CFI60 objective?
Poster:tholste
Posted Date:2012-07-26 16:15:00.0
A response from Tor at Thorlabs: Thank you for taking the time to contact us. The tube lens is designed for compatibility with the Nikon CFI60 objectives. The performance will be very similar to that of the tube lenses provided with these microscopes. These are apochromatically designed, so they will offer better color-correction as compared to a standard achromatic lens. This is AR-coated for the visible spectrum; we are in the process of measuring the transmittance over the next few weeks, and I will share these data with you as soon as they are available. Please contact techsupport@thorlabs.com if you have additional inquiries.
Poster:j.hohlbein1
Posted Date:2012-07-24 11:47:58.0
I have the same question (and some more): is the ITL200 similar to the tube lenses found in Olympus or Nikon microscopes? Is it anti-reflection coated? Could you specify the advantages over using achromatic lenses? What is the transmittance? Thanks!
Poster:tcohen
Posted Date:2012-04-18 09:33:00.0
Response from Tim at Thorlabs: Thank you for your feedback. We are looking into this and will update you shortly.
Poster:rpalacios
Posted Date:2012-04-13 12:34:44.0
Is this tube lens compatible with any of the Nikon CFI60 series objectives? Is it the same tube lens found inside the body of the newest Nikon fluorescence microscopes (e.g. TE2000 or Eclipse Ti)?

200 mm Focal Length Tube Lenses Optimized for Widefield Imaging

Tube Lens Transmission
Click to Enlarge

A comparison of TTL200 and ITL200 transmission.
  • 200 mm Focal Length
  • True Imaging Lenses for Forming a Well-Corrected Infinity Optical System
  • Apochromatically Corrected for Lateral and Axial Chromatic Aberration Across the Field of View
  • Better Overall Aberration Correction than a Standard Achromat
  • High Transmission from Visible to Near IR Wavelengths

Thorlabs offers two infinity-corrected tube lenses for widefield imaging. The TTL200 is optimized for performance in the visible wavelength range, offering a wider diffraction-limited axial color range and improved performance at shorter wavelengths (<480 nm) to accommodate applications using 405 nm and 443 nm illumination. A comparison of the transmission of both lenses is provided in the graph above.

The TTL200 lens can also be custom coated with either a single layer or a multi-layer coating optimized for transmission over a user-specified wavelength range; contact Tech Support for details.

An objective lens creates an image of an object at infinity; put another way, the objective forms parallel bundles of light rays for each position on the object. These tube lenses are designed to refocus these parallel bundles onto the active area of a detector, as illustrated in the diagram above. In the diagram, the blue rays originate from the object on the optical axis, while the red rays originate off-axis. Since the rays from the objective are in parallel bundles, the tube lens can be located anywhere from 70 to 170 mm from the shoulder of the objective for best results. If the tube lens is closer than 70 mm, the image may suffer from aberrations, and if it is farther than 170 mm, vignetting will occur.

Mounting Options
Both of these tube lenses use an external M38 x 0.5 thread. For mounting using Thorlabs' standard optomechanics, the M38 x 0.5 thread can be easily converted to external SM2 (2.035"-40) threading using the SM2A20 adapter (available below), which enables the construction of optical systems using Thorlabs' standard SM2 lens tube components. We also offer SM2-threaded adapters for common objective threads.

For integration with our Cerna DIY Microscopy Systems, the WFA4111 Dovetail Adapter (available below) features internal M38 x 0.5 threads that directly accept a TTL200 or ITL200 tube lens. The bottom of the adapter has a D1N dovetail that mates directly to an epi-illumination module or the epi-illumination arm of a Cerna microscope, while the top is externally SM2 threaded to facilitate the construction of custom camera tubes. Alternatively, Thorlabs' WFA4110 Dovetail Adapter is a version of the WFA4111 with the ITL200 tube lens built in.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
TTL200 Support Documentation
TTL200Infinity-Corrected Tube Lens, f = 200 mm, Optimized Color Correction
$450.00
Today
ITL200 Support Documentation
ITL200Infinity-Corrected Tube Lens, f = 200 mm
$450.00
Today

200 mm Focal Length Tube Lenses Optimized for Laser Scanning

Scan and Tube Lens Integration
Click to Enlarge

The tube and scan lens schematic above shows the TL200-2P2 tube lens and SL50-2P2 scan lens. It indicates the working distance and pupil distance for the tube lens, as well as the location of the  scan lens and the scan plane. Most of these values also apply for the other tube lenses and their corresponding scan lenses; note that for the SL50-CLS2 the entrance pupil at the scan plane is a maximum of Ø4 mm and the pupil distance tolerance of the scan lens is +12/-5 mm for the TL200-CLS2.
  • 200 mm Focal Length
  • Infinity-Corrected Design Optimized for Laser Scanning Microscopy
  • Versions for Visible and NIR Wavelengths:
    • TL200-CLS2: 450 - 1100 nm
    • TL200-2P2: 680 - 1600 nm
    • TL200-3P: 900 - 1900 nm

Thorlabs offers three infinity-corrected tube lenses that have been optimized for laser scanning applications. The TL200-CLS2 is AR coated for the visible and NIR range (450 - 1100 nm), making this lens ideal for confocal laser scanning microscopy; it is designed to be used with the SL50-CLS2 scan lens. Additionally, the broad coating range makes the TL200-CLS2 tube lens a good choice for applications involving both multiphoton microscopy and visible photoactivation or targeting. In comparison, the TL200-CLS2 and TL200-3P are AR coated for 680 - 1600 nm and 900 - 1900 nm, and are designed for use with the SL50-2P2 and SL50-3P scan lenses, respectively. These two lenses are otherwise identical, and are ideal for two-photon or three-photon imaging.

The tube lenses are engraved with an arrow next to an infinity symbol (∞) to indicate which side of the lens should face the objective (infinity space).

In general, laser scanning microscopy systems pair a scan lens with a tube lens, such as those sold here, to create an infinity-corrected optical system. In laser scanning systems, a laser beam incident on the back aperture (entrance pupil) of the scan lens is scanned through a range of angles. This translates the position of the spot formed in the image plane across the lens' field of view. Telecentric scan lens systems are designed to create a uniform spot size in the image plane at every scan position, which allows a high-quality image of the sample to be formed. 

Mounting Options
These tube lenses feature SM2 (2.035"-40) threading; they are externally threaded on the end of the lens which faces the objective and internally threaded on the end of the lens which faces the scan lens. This design allows the tube lenses to be mounted within a 60 mm Cage System.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
TL200-CLS2 Support Documentation
TL200-CLS2NEW!Tube Lens, f = 200 mm, Optimized for Scanning, ARC: 450 - 1100 nm
$4,849.00
Lead Time
TL200-2P2 Support Documentation
TL200-2P2NEW!Tube Lens, f = 200 mm, Optimized for Scanning, ARC: 680 - 1600 nm
$4,849.00
Today
TL200-3P Support Documentation
TL200-3PNEW!Tube Lens, f = 200 mm, Optimized for Scanning, ARC: 900 - 1900 nm
$5,111.89
Lead Time

Mechanical Adapters for ITL200 and TTL200 Tube Lenses

Modular Tube Lens
Click to Enlarge

A WFA4111 can be used to integrate a TTL200 tube lens into a custom epi-illumination module on a DIY Cerna Microscope.
Modular Tube Lenses for Cerna Microscopes
Click to Enlarge

The WFA4111 adapter allows the TTL200 to be easily integrated with Cerna microscopes and SM2-threaded components.
  • Mechanical Adapters to Easily Integrate ITL200 and TTL200 Tube Lenses with Thorlabs' Construction Systems
  • SM2A20: Externally SM2-Threaded Adapter for Compatibility with SM2 Lens Tubes
  • WFA4111: D1N Male Dovetail for Using Tube Lenses in Cerna DIY Systems and Microscopes

Thorlabs offers two styles of mechanical adapters for use with the ITL200 and TTL200 tube lenses. Both adapters feature internal M38 x 0.5 threads.

The SM2A20 allows the TTL200 and ITL200 to be easily converted to SM2 (2.035"-40) threading, enabling the construction of an optical system consisting of a scan lens and a tube lens using Thorlabs' standard SM2 lens tube components and the SM2-threaded GCM102(/M) 2D galvo mounting adapter. We also offer SM2-threaded adapters for common objective threads.

Our WFA4111 Dovetail Adapter also accepts M38 x 0.5 threaded tube lenses and features a male D1N dovetail, making it compatible with our DIY Cerna systems. The top of the adapter features SM2 external threads, allowing easy integration of user-designed camera tubes constructed from our SM2-threaded lens tubes.

We also offer the WFA4110 Dovetail Adapter, a version of the WFA4111 adapter that includes the ITL200 tube lens.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
SM2A20 Support Documentation
SM2A20Adapter with External SM2 Threads and Internal M38 x 0.5 Threads
$45.00
Today
WFA4111 Support Documentation
WFA4111Adapter with Male D1N Dovetail and External SM2 Threads
$288.19
Today
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