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Infinity-Corrected Tube Lens


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Infinity-Corrected Tube Lens

Features

  • True Imaging Lens 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

The ITL200 is an infinity-corrected tube lens designed for use with Plan Fluorite Visible Imaging Objectives, specifically our line of Nikon objectives. The tube lens has an effective focal length of 200 mm and is ideal for applications such as imaging onto a CCD camera. The lens features an apochromatic design consisting of two doublet lenses to correct lateral and axial chromatic aberration across the entire field of view in the visible range. The lens will have better overall aberration correction than a standard achromat, especially off axis. The lens also has diffraction-limited performance to field number 25 for visible wavelengths. The lens is AR coated to improve performance for visible wavelengths; please see the Specs tab for a plot of the transmission. For those interested in building their own tube lens with a focal length of 180 mm, we also carry Ø2" AR-coated achromatic doublets, specifically AC508-180-A and AC508-180-A-ML.

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.The tube lens is designed to refocus these parallel bundles onto the active area of a detector, as illustrated in the diagram to the right. 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 lens is closer than 70 mm, the image may suffer from aberrations, and if the tube lens is further away than 170 mm, the scan lens will be overfilled.

The ITL200 tube lens can also be paired with the CLS-SL Visible Scan Lens. In this configuration, the tube lens will relay the scan plane of a laser scanning imaging system to the back aperture of the imaging objective.

The M38 x 0.5 external thread on the ITL200 can be easily converted to SM2 (2.035"-40) threading using the SM2A20 adapter, which enables the construction of an optical system consisting of a scan lens and a tube lens using Thorlabs' standard SM2 lens tube components.

Typical Application and Spacing of ITL200 Tube Lens
Tube Lens Schematic
Click To Enlarge

*For Best Performance
Specifications
Effective Focal Length200 mm
Working Distancea148 mm
Optimal Distance Between Tube Lens and Objective70 - 170 mm
Lens DesignApochromatic
AR CoatingVisible Wavelengths
  • Measured from the housing edge to the image plane (see the diagram to the right).
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Posted Comments:
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: 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: 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: 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: 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 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: 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 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: 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: 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: 2013-02-20 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: 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: 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)?
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ITL200 Support Documentation
ITL200 Infinity-Corrected Tube Lens for Plan Fluorite Objectives
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SM2A20 Adapter with External SM2 Threads and Internal M38 x 0.5 Threads
$45.00
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