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Bi-Telecentric Lenses for Machine Vision


  • Ideal for Machine Vision Applications
  • Provide Constant Magnification Independent of Object Location
  • Lenses Available with Magnification from 0.051X to 2X

MVTC23013

0.128X Bi-Telecentric Lens

Application Idea

0.528X Bi-Telecentric Lens
with DCU224C CCD Camera

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Features

  • Bi-Telecentric Lenses Offer Constant Magnification Across the Depth of Field
  • Magnifications Available: 0.051X, 0.128X, 0.243X, 0.528X, 1.00X, or 2.00X
  • Compatible with C-Mount Cameras with Sensors up to 2/3" Format
  • Each Lens Ships with Individual Metrology and Performance Data

Thorlabs has collaborated with Navitar to design and manufacture a line of telecentric lenses for machine vision applications. With bi-telecentric lenses, the magnification in both image and object space is independent of distance (within the depth of field) or the position in the field of view. This attribute is ideal for machine vision applications: when measuring dimensions, a telecentric lens will yield the same measurement regardless of changes in object distance or position. For more details on telecentric lenses and their differences from standard lenses, please see the Telecentric Tutorial tab above.

Thorlabs offers telecentric lenses with various magnification levels: 0.051X, 0.128X, 0.243X, 0.528X, 1.00X, or 2.00X. Each lens has an adjustable iris that varies the f/#. The lenses are designed for 2/3" format sensors, such as those on our scientific CCD cameras. Sensors smaller than 2/3", such as those in our other CCD and CMOS cameras, can also be used but with reduced field of view (field of view values for various sensor formats can be found on the Specs tab). The lens housing features external C-Mount (1.000"-32) threading on the image side of the lens, which is also compatible with our cameras. By using an SM1A10 thread adapter, the C-Mount can be mated to internal SM1 (1.035"-40) threads for compatibility with our Lens Tubes or other SM1-threaded mounts.

Each individual lens ships with a detailed test report showing the exact specifications and graphs for the lens; PDF samples are available in the table below. Graphs showing typical performance for field curvature, distortion, relative illumination, and Modulation Transfer Function (MTF) can be found on the Graphs tab above.

Please note that due to the size and weight of the MVTC23005 and MVTC23013, users must take care to properly mount and support these lenses.

Key Specificationsa
Item # MVTC23005b MVTC23013 MVTC23024 MVTC23053 MVTC23100 MVTC23200
Magnification 0.051X 0.128X 0.243X 0.528X 1.00X 2.00X
Working Distancec 530 mm 176 mm 103 mm 44 mm 62.2 mm 55.9 mm
Depth of Fieldd ±260 mm ±15 mm ±11 mm ±1 mm ±0.9 mm ±0.3 mm
Field of View for
2/3" Format Sensor (Full)e
214 mm 86.2 mm 45.2 mm 20.8 mm 11 mm 5.5 mm
Modulation Transfer Function
(MTF)f
>51% >55% >51% >51% >42% >39%
Sample Test Report
Lens Mount C-Mount (1.000"-32)
Lens Lengthg,h 24.84" (630.8 mm) 11.13" (282.8 mm) 6.36" (161.6 mm) 5.29" (134.4 mm) 2.58" (65.6 mm) 4.05" (102.9 mm)
Lens Housing Diameter
at Largest Pointh
Ø9.44" (Ø239.8 mm) Ø4.06" (Ø103.0 mm) Ø2.60" (Ø66.0 mm) Ø1.45" (Ø36.8 mm) Ø1.48" (Ø37.7 mm) Ø1.48" (Ø37.7 mm)
Weight 13.0 kg (28.7 lbs)b 1.7 kg (3.7 lbs) 0.61 kg (1.34 lbs) 0.7 kg (1.5 lbs) 0.18 kg (0.40 lbs) 0.26 kg (0.56 lbs)
  • Complete specifications may be found on the Specs tab.
  • The MVTC23005 is shipped in a heavy-duty carrying case.
  • Working distance is defined from the center of the depth of field to the first mechanical surface of the lens housing.
  • Specified at 20 lp/mm, 50% MTF, at the max aperture setting.
  • The field of view is specified in the direction along the sensor diagonal. Field of view values for additional sensor formats may be found on the Specs tab.
  • Specified at 70 lp/mm, across the field.
  • Not including the threaded C-Mount.
  • For more details, please see the Support Documents by clicking the red Docs icon next to an item number below.
Item #MVTC23005MVTC23013MVTC23024MVTC23053MVTC23100MVTC23200
Magnification0.051X0.128X0.243X0.528X1.00X2.00X
Magnification Error± 1%± 2%± 1%± 1%± 1%± 1%
Image Diagonal11 mm (2/3" Format)
Working Distancea530 mm176 mm103 mm44 mm62.2 mm55.9 mm
Depth of Fieldb±260 mm±15 mm±11 mm±1 mm±0.9 mm±0.3 mm
Working f/#cf/8f/7f/8f/7f/11f/11
System f/#f/7.7 - f/22f/6.2 - f/22f/6.5 - f/22f/4.6 - f/22f/5.6 - f/16f/3.7 - f/32
Field of View for
2/3" Format Sensor (Full)d
214 mm86.2 mm45.2 mm20.8 mm11 mm5.5 mm
Telecentricity0 ± 0.03°0 ± 0.01°0 ± 0.04°0 ± 0.17°0 ± 0.04°0 ± 0.02°
Max Distortion0 ± 0.03%0 ± 0.01%0 ± 0.02%0 ± 0.035%0 ± 0.002%0 ± 0.01%
Modulation Transfer Function (MTF)e>51%>55%>51%>51%>42%>39%
Coherent Transfer Function (CTF)e>63%>67%>63%>62%>54%>49%
Image NA0.06140.0710.0620.0710.0450.045
Object NA0.003150.00910.0150.0380.0450.090
Lateral ColorR-G: <1.7 µm
B-G: <0.08 µm
R-G: <2.8 µm
B-G: <1 µm
R-G: <1 µm
B-G: <1 µm
R-G: <3 µm
B-G: <1 µm
R-G: <1.7 µm
B-G: <0.05 µm
R-G: <2.3 µm
B-G: <0.4 µm
Average Transmittance96%f97%f97%f97%f94%f93%g
Lens MountC-Mount (1.000"-32)
Lens Lengthh,i24.84" (630.8 mm)11.13" (282.8 mm)6.36" (161.6 mm)5.29" (134.4 mm)2.58" (65.6 mm)4.05" (102.9 mm)
Lens Housing Diameter
at Largest Pointi
Ø9.44" (Ø239.8 mm)Ø4.06" (Ø103.0 mm)Ø2.60" (Ø66.0 mm)Ø1.45" (Ø36.8 mm)Ø1.48" (Ø37.7 mm)Ø1.48" (Ø37.7 mm)
Lens Weight13.0 kg (28.7 lbs)1.7 kg (3.7 lbs)0.61 kg (1.34 lbs)0.7 kg (1.5 lbs)0.18 kg (0.40 lbs)0.26 kg (0.56 lbs)
  • Working distance is defined from the center of the depth of field to the first mechanical surface of the lens housing.
  • Specified at 20 lp/mm, 50% MTF, at the maximum aperture setting. Depth of field values for different aperture settings are given in the table below.
  • The working f/# is the value used for determining the other specifications unless otherwise stated.
  • The field of view is specified in the direction along the sensor diagonal. Values for additional sensor formats can be found in the tables below.
  • Specified at 70 lp/mm, across the field.
  • Specified Over 460 nm - 630 nm.
  • Specified Over 486 nm - 656 nm.
  • Not including the threaded C-Mount.
  • For more details, please see the Support Documents by clicking the red Docs icon next to an item number below.

Depth of Field

Depth of Field for MVTC23005
0.051X Telecentric Lens
f/#Depth of Field
7.7±260 mm
11±370 mm
16±540 mm
22±740 mm

Field of View

Field of View for MVTC23005
0.051X Telecentric Lens
Sensor FormatField of View (Full)
1/3"118 mm
1/2"156 mm
1/1.8"174 mm
2/3"214 mm
Depth of Field for MVTC23013
0.128X Telecentric Lens
f/#Depth of Field
6.2±15 mm
12±25 mm
18±40 mm
22±50 mm
Field of View for MVTC23013
0.128X Telecentric Lens
Sensor FormatField of View (Full)
1/3"47.0 mm
1/2"62.7 mm
1/1.8"70.0 mm
2/3"86.2 mm
Depth of Field for MVTC23024
0.243X Telecentric Lens
f/#Depth of Field
6.5±11 mm
12±20 mm
18±30 mm
22±37 mm
Field of View for MVTC23024
0.243X Telecentric Lens
Sensor FormatField of View (Full)
1/3"24.7 mm
1/2"32.9 mm
1/1.8"37.0 mm
2/3"45.2 mm
Depth of Field for MVTC23053
0.528X Telecentric Lens
f/#Depth of Field
4.6±1 mm
7±1.15 mm
12±1.5 mm
22±2.5 mm
Field of View for MVTC23053
0.528X Telecentric Lens
Sensor FormatField of View (Full)
1/3"11.4 mm
1/2"15.1 mm
1/1.8"16.9 mm
2/3"20.8 mm
Depth of Field for MVTC23100
1.00X Telecentric Lens
f/#Depth of Field
5.6±0.9 mm
8±1.3 mm
11±1.8 mm
16±2.6 mm
Field of View for MVTC23100
1.00X Telecentric Lens
Sensor FormatField of View (Full)
1/3"6.0 mm
1/2"8.0 mm
1/1.8"8.3 mm
2/3"11.0 mm
Depth of Field for MVTC23200
2.00X Telecentric Lens
f/#Depth of Field
3.7±0.3 mm
8±0.6 mm
16±1.3 mm
32±2.6 mm
Field of View for MVTC23200
2.00X Telecentric Lens
Sensor FormatField of View (Full)
1/3"3.0 mm
1/2"4.0 mm
1/1.8"4.2 mm
2/3"5.5 mm

Click on the icons in the table below to see performance graphs for each telecentric lens. These graphs show the theoretically calculated modeling results from Zemax for the field curvature, distortion, relative illumination, and Modulation Transfer Function (MTF) for our telecentric lenses. Each lens ships with an individual test data sheet that contains test data for the lens, including plots of the MTF and distortion.

Item #Lens MagnificationField CurvatureDistortionRelative Illumination
@ 588 nm
MTF
MVTC230050.051XField Curvature of 0.051X Telecentric LensDistortion of 0.051X Telecentric LensRelative Illumination of 0.051X Telecentric Lensf/7.7f/11f/22
MTF of 0.051X Telecentric LensMTF of 0.128X Telecentric LensMTF of 0.051X Telecentric Lens
MVTC230130.128XField Curvature of 0.128X Telecentric LensDistortion of 0.128X Telecentric LensRelative Illumination of 0.128X Telecentric Lensf/6.2f/12f/22
MTF of 0.128X Telecentric LensMTF of 0.128X Telecentric LensMTF of 0.128X Telecentric Lens
MVTC230240.243XField Curvature of 0.243X Telecentric LensDistortion of 0.243X Telecentric LensRelative Illumination of 0.243X Telecentric Lensf/6.5f/12f/22
MTF of 0.243X Telecentric LensMTF of 0.243X Telecentric LensMTF of 0.243X Telecentric Lens
MVTC230530.528XField Curvature of 0.528X Telecentric LensDistortion of 0.528X Telecentric LensRelative Illumination of 0.528X Telecentric Lensf/4.6f/7f/22
MTF of 0.528X Telecentric LensMTF of 0.528X Telecentric LensMTF of 0.528X Telecentric Lens
MVTC231001.00XField Curvature of 1.00X Telecentric LensDistortion of 1.00X Telecentric LensRelative Illumination of 1.00X Telecentric Lensf/5.6f/8f/16
MTF of 1.00X Telecentric LensMTF of 1.00X Telecentric LensMTF of 1.00X Telecentric Lens
MVTC232002.00XField Curvature of 2.00X Telecentric LensDistortion of 2.00X Telecentric LensRelative Illumination of 2.00X Telecentric Lensf/3.7f/8f/32
MTF of 2.00X Telecentric LensMTF of 2.00X Telecentric LensMTF of 2.00X Telecentric Lens

Telecentric Lenses

Telecentric lenses are designed to have a constant magnification regardless of the object's distance or location in the field of view. This attribute is ideal for many machine vision measurement applications, as measurements of an object's dimension will be independent of where it is located.

Types of Telecentric Lenses
In order to achieve a telecentric lens design, all of the chief rays (rays from an off-axis point that pass through the center of the aperture stop) have to be parallel to the optical axis in either image space or object space, or both. For an object space telecentric lens, the chief rays will be parallel to the optic axis on the object's side of the lens (object space). This is accomplished by setting the aperture stop at the front focal plane of the lens, which results in an entrance pupil at infinity. Since chief rays are directed towards the center of the entrance pupil, the chief rays on the object side of the lens will be parallel to the optical axis. An example of an object space telecentric lens is shown in Figure 1.

Telecentric Lens Schematic
Figure 1: A ray trace through an idealized object space telecentric lens system. Note that the chief rays (the center ray of each color) is parallel to the optical axis in object space, but in image space, the chief rays form an angle with the optical axis.

For an image space telecentric lens, the chief rays will be parallel to the optical axis on the image's side of the lens (image space). This is accomplished by setting the aperture stop at the back focal plane of the lens, which results in an exit pupil at infinity. Since the chief rays must pass through the center of the exit pupil, the chief rays on the image side of the lens must be parallel to the optical axis. For a double telecentric, or bi-telecentric, lens, the front and back focal planes are made to overlap so that the aperture stop is located where both the entrance and exit pupils are at infinity. In a bi-telecentric lens, neither the image or object location will affect the magnification. Thorlabs' telecentric lenses are all bi-telecentric designs. Figure 2 shows an example ray trace through a telecentric lens and illustrates how the chief rays pass through the system.

Telecentric Lens Schematic
Figure 2: A ray trace through an idealized bi-telecentric lens system. Note that the chief rays (the center ray of each color) is parallel to the optical axis in both image and object space, which means that the magnification will remain constant regardless of object distance.

Conventional Lenses
In conventional lenses, the entrance and exit pupils are not located at infinity, so the chief rays will not be parallel to the optical axis. In this case, the magnification of the object depends on its distance from the lens and its position in the field of view. Figure 2 shows an example ray trace through a conventional camera lens; notice how the chief rays are angled with respect to the optical axis in both image and object space. Note that both Figures 2 and 3 feature the same lens design; only the aperture stop location was varied to shift the telecentric system to a non-telecentric one.

Non-Telecentric Lens Schematic
Figure 3: A ray trace through an idealized conventional camera lens system. Note that the chief rays (the center ray of each color) is not parallel to the optic axis in both image and object space, which means that the magnification will vary with object distance.

Example Images
Figures 4 and 5 show photographs taken with a telecentric lens and a standard camera lens, respectively. With the telecentric imaging system, the height of the two screws appears to be the same, even though the object planes are separated by approximately 45 mm along the optical axis. With the conventional imaging system, the two screws appear to be different heights, and therefore a machine vision system based on this lens will lead to incorrect dimensional measurements.

Telecentric Machine Vision Lenses
Click to Enlarge

Figure 4: An image of two identical 8-32 cap screws imaged with our MVTC23013 0.128X Telecentric Lens. Although the screws appear to be the same size and in the same object plane, they are actually separated by a distance of approximately 45 mm along the optical axis.
Telecentric Machine Vision Lenses
Click to Enlarge

Figure 5: The same two screws photographed with our MVL7000 conventional zoom lens. In this image, the perspective error due to the separation of the screws would lead to incorrect height measurements.

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Posted Comments:
Poster:lylaana
Posted Date:2017-06-16 10:36:13.423
Hi, I'am tying to build a simple imaging system for QR code scanner. I'am wondering if this bi-telecentric lens is enough for a CMOS image sensor. Will extra lens be needed? Thank you very much!
Poster:tfrisch
Posted Date:2017-06-27 10:09:12.0
Hello, thank you for contacting Thorlabs. These lenses are all C-mount threaded which is a common thread for a CMOS camera, and they can be used directly with a C-mount camera. Some CMOS cameras are CS-mount which uses the same thread, but a shorter flange focal distance (the distance from the flange of the lens to the sensor). In those cases, an adapter like CML05 can be used. I will reach out to you directly to discuss your application.
Poster:tfrisch
Posted Date:2017-06-27 10:09:12.0
Hello, thank you for contacting Thorlabs. These lenses are all C-mount threaded which is a common thread for a CMOS camera, and they can be used directly with a C-mount camera. Some CMOS cameras are CS-mount which uses the same thread, but a shorter flange focal distance (the distance from the flange of the lens to the sensor). In those cases, an adapter like CML05 can be used. I will reach out to you directly to discuss your application.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
MVTC23005 Support Documentation
MVTC230050.051X Bi-Telecentric C-Mount Camera Lens for Sensor Formats up to 2/3"
$8,180.00
Today
MVTC23013 Support Documentation
MVTC23013Customer Inspired!0.128X Bi-Telecentric C-Mount Camera Lens for Sensor Formats up to 2/3"
$1,867.00
Today
MVTC23024 Support Documentation
MVTC230240.243X Bi-Telecentric C-Mount Camera Lens for Sensor Formats up to 2/3"
$1,279.00
Today
MVTC23053 Support Documentation
MVTC23053Customer Inspired!0.528X Bi-Telecentric C-Mount Camera Lens for Sensor Formats up to 2/3"
$980.00
Today
MVTC23100 Support Documentation
MVTC231001.00X Bi-Telecentric C-Mount Camera Lens for Sensor Formats up to 2/3"
$1,074.00
Today
MVTC23200 Support Documentation
MVTC232002.00X Bi-Telecentric C-Mount Camera Lens for Sensor Formats up to 2/3"
$1,074.00
Today
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