Light filtering is a typical need in machine vision applications. Together with LED illuminators, filters can improve image contrast by blocking unwanted light and increase the accuracy and repeatability of the vision system.

Ambient light is very frequently causing errors in imaging systems due to unwanted reflections off the surface of the parts being measured. In these cases, a band pass or long pass filter that matches the emission wavelength of the illuminator is usually integrated in front of the imaging lens: this way, only the light coming from the illuminator is collected while the rest of the spectrum is cut out.

Furthermore, many machine vision applications require monochrome illumination in order to enhance or suppress particular object features: under these conditions, only the features with a certain color are imaged and inspected.

KEY ADVANTAGES

High and precise transmission.
Wide range selection
Available for fixed focal length lenses and telecentric lenses.
Increase resolution.
Block unwanted light
Tolerate high temperature environment.

Telecentric lens filters

Filters for fixed focal lens

Putting a filter in front of a telecentric lens can be very inconvenient when the size of the lens is very big. The filter should be as large as the front element of the lens, thus becoming very expensive.

To overcome size and cost issues, Opto Engineering designed a smart filter adaptor that can be easily plugged into the rear part of the lenses. This simple and cost-effective accessory is compatible with all TC12yyy and TC23yyy bi-telecentric lenses and with the C-mount versions of TC4M and TC2M series bi-telecentric lenses.

The bi-telecentricity of the Opto Engineering lenses makes this solution very efficient, since the rays remain parallel when passing through the filter. This allows for the optical bandpass to be maintained across the entire image surface.

Since inserting the filter will increase the back focal length of the lens, spacers (included in the TC lens package) must be added to the C-mount in order to set the lens back to its nominal working distance; the overall thickness of the spacers is usually equal to 1/3 of the filter thickness.

The supported filter diameter is 17.50 mm and the maximum recommended filter thickness is 4.00 mm.

Compatible products

TC telecentric lens for matrix detectors

TC series

Bi-telecentric lenses for sensors up to 2/3”

4x Telecentric Lenses for up to 2/3″″ Detectors: WD 110 mm

TCHM series

High magnification telecentric lenses for sensors up to 2/3”

TC CORE series

Compact bi-telecentric lenses for sensors up to 2/3”

TCUV series

UV bi-telecentric lenses

TCSM telecentric lens with 3D Scheimpflug adjustment

TCSM series

3D bi-telecentric lenses with Scheimpflug adjustment

TCLWD series

132 mm working distance telecentric lenses for sensors up to 2/3”

1x Very Long Working Distance Telecentric Lenses for up to 1/1.8″ Detectors

TCVLWD series

Long working distance telecentric lenses for sensors up to 1/1.8”

TCCX telecentric lens with coaxial illumination capabilities, long working distance

TCCX series

132mm working distance coaxial telecentric lenses for sensors up to 2/3”

6x High magnification telecentric lenses with built-in coaxial illumination for detectors up to 2/3″: WD 71 mm

TCCXHM series

High magnification coaxial telecentric lenses for sensors up to 2/3”

0,4x Telecentric Lenses with built-in Coaxial Illumination for up to 2/3″ Detectors

TCCXLM series

Coaxial telecentric lenses for sensors up to 2/3”

TCCXQ series

Coaxial telecentric assemblies for sensors up to 2/3”

TCBENCH telecentric optical assembly for machine vision applications

TCBENCH series

Telecentric optical benches for precision measurements

TCBENCH CORE series

Compact telecentric optical benches for precision measurements

TCKIT case

Telecentric optics selection for machine vision labs

TCEDGEVIS series

Telecentric system for defect detection on flat transparent materials

High-resolution telecentric lens for large detectors

TC2MHR and TC4MHR series

High resolution telecentric lenses for large detectors up to 1.2″

TC1MHR-TC4MHR CORE series

Compact telecentric lenses for sensors up to 4/3”

TCDP PLUS series

Dual magnification telecentric lenses

TC16M telecentric lens for very large detectors

TC16M series

Telecentric lenses for sensors up to 43.3 mm and 8k line scan cameras

TC4K090-N flat telecentric lens for 4k linescan cameras

TC4K series

Flat telecentric lenses for 4k line scan sensors

TC12K telecentric lens for linescan cameras

TC12K series

Telecentric lenses for 12k line scan cameras and sensors up to 62 mm

EN-2RT series

2 Megapixel fixed focal length lenses for sensors up to 2/3”

5-megapixel lens, focal length 12 mm, f# 1.8-16, C-mount

EN-5RT series

5 Megapixel fixed focal length lenses for sensors up to 2/3”

ENMT series

Fixed focal length lenses with motorized focus and aperture control

ENVF series

Vari focal lenses for sensors up to 2/3”

EN-9RT series

9 Megapixel fixed focal length lenses for sensors up to 1”

UV (365 nm) C-mount lens, 25 mm F2.8, for up to 1" detectors

ENUV2M Series

UV fixed focal length lenses for sensors up to 1”

EN-10RT series

10 Megapixel fixed focal length lenses for sensors up to 1.1”

Technical documents

Filter thread compatibility table

Find more videos on our Vimeo channel

Application examples

Please, select your Mount first to view available filters:

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