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Telecentric Objectives

No perspective Error for Measurement Applications

With a normal (entocentric) lens, magnification differs when changing the distance from the lens, like seeing with our eyes. Additionally, features which are located at the edge of an image are viewed at a different angle than objects in the centre of the field of view (FoV). This makes the measurement task very difficult.

Telecentric lenses are used for performing exact measurements of objects because they offer images which represent the exact size of an object regardless of its position within the FoV or its distance from the lens. 

Like all our products, we offer custom made lenses tailored to your specific needs on request.



Entozentrischen Aufnahme

Shooting with entocentric lens

Dummy 360x360

Telezentrische Aufnahme

Shooting with a telecentric lens

Picture of same object': left with a entocentric and added the right with a telecentric lens. One sees clearly left the perspective distortions that come about through the divergent (divergent) beam paths of the entocentric (normal) lens.


Bi-telecentric

Bi-telezentrische Objektive

All Opto telecentrics are optimized for C-mount cameras with chip sizes up to 2/3“, and represent the ideal solution for measurements of precision components with the best price/performance ratio.


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Advantages
  • Large Field Depth
  • No perspective error with three dimensional objects
  • Homogeneous image acquisition with high light sensitivity
  • High resolution Object- and image side telecentric imaging
  • Universal C-Mount
Applications & Markets
  • Measurement of profiles
  • Determination of diameters
  • Adjustment of electronic components
  • Measurement of objects with large height
  • C-Mount cameras supported up to 2/3“ (CCD- or CMOS-chip)

Image taken with a standard objective

Image taken with our bi-telecentric objective

 

Specification

Article No.      100-BTC-006    100-BTC-008   100-BTC-010100-BTC-016  100-BTC-020 100-BTC-032
Magnification0.060.080.10.160.20.32
Exact magnific.0.060.081 0.0980.1570.20.317
1/2“ FOV106.7x8079x59.265x4940.7x30.532x2420.1x15.1
1/1.8“ FOV118x8988x6572x5445x33.835x2722.3x16.7
2/3“ FOV*142x106105x7986x6554x40.542.5x3226.7x20
 F/#888888
MTF@70LP/MM505050504545
Depth of focus [mm]    1861016827177
Telecentricity [°]0.080.080.080.080.080.08
Distortion [%]0.070.070.070.080.080.08
Total tube length 446346296236171146
 W.D.354.46255.57209.7150102.570.7
Clamp diameter1106363636340
Clamp length [mm]                120.854.554.554.554.552
MountCCCCCC

   

datasheet Brochure to download (4 MB)
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Quadra Mount

Quadra Mount Objektive

Our bi-telecentric objectives are now even more practical: our new QuadraMount versions are equipped as standard with a 4-sided flat profile, enabling easy installation and setup.

Precision, robust alignment of the optical components in any machine vision setup is crucial to the overall optical performance of the system, and msut be carefully considered during the design of an optical measurement system.



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Specification

Article No.      100-BTC-006-P  100-BTC-008-P  100-BTC-010-P   100-BTC-016-P100-BTC-020-P 100-BTC-032-P
Magnification0.060.080.10.160.20.32
Exact magnific.0.060.0810.0980.1570.20.317
1/2“ FOV106.7x8079x59.265x4940.7x30.532x2420.1x15.1
1/1.8“ FOV118x8988x6572x5445x33.835x2722.3x16.7
2/3“ FOV*142x106105x7986x6554x40.542.5x3226.7x20
 F/#888888
MTF@70LP/MM505050504545
Depth of focus [mm]    1861016827177
Telecentricity [°]0.080.080.080.080.080.08
Distortion [%]0.070.070.070.080.080.08
Total tube length 446346296236171146
 W.D.354.46255.57209.7150102.570.7
MountCCCCCC
Weight [kg]6.82.82.61.71.50.8


datasheet Data sheet to download (4 MB)
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Telecentric test bench

Test Bench

The combination of a Bi-telecentric lens and a collimated telecentric illuminator ensures optimised resolution and perfect image quality.

The optimum utilisation of the entire 17mm depth of field of guarantees perfect measurement of round objects such as springs, screws, bottles.
 
Transmitted light configuration allows high speed image acquisition Standard aluminium profile construction enables easy machine integration Can be used in horizontal or vertical orientation


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The Features for easy measurement 

Optimized for 1 1/8“ and 2/3“ C-Mount Cameras
FoV with a 2/3“ camera 42x32mm (52mm Image circle)
Resolution 45% @ 70LP/mm
Field Depth +/-8mm
Telecentricity 0,08
F-No.: F8
Distortion 0,08

All featuring: 

• Integrated 0,2x Bi-Telecentric Objective lens
• Telecentric illuminator (Red, Blue, White)
    ‘M12´ type power cable (1m)
    Input Voltage 24V DC
    Forward Current 700mA
    On/OFF Time 300ys
    Maximum trigger Frequency 300Hz
• Manufactured from standard aluminium profile enabling simple integration
• Complete unit can be vertically or horizontally oriented
• Column length: 550mm
• Target Holder carriage for horizontal and vertical position
• Pre adjusted for precise measurements
• Every unit fully tested


datasheet Data sheet to download (794 kB)
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