How to mount a C-mount filter
Color camera models are equipped with an IR-cut filter (cut-off at 700 nm).
Monochrome models have a clear glass window instead.
Before installing a C-mount filter, you must remove the existing IR filter or glass window.
If you do not remove it, the lens cannot be screwed in far enough to achieve proper focus.
⚠️ Note: Removing the IR filter or glass window will shift the image plane and may cause defocus if no replacement glass is installed.
Tools Required
Knipex Tool: VA-TOOL-KNIPEX-CMT-FLT
This tool allows you to:
Remove the built-in IR filter or glass window (at your own risk).
Mount C-mount filters directly inside the C-mount of the camera.
It is necessary to remove this IR cut / transparent filter when you want to use any of our C-mount filters as otherwise you can’t screw the lens far enough to focus it.
Steps to use C-mount filter
Note: (the 1mm ring you see in the picture is always delivered along with C-mount filters)
Important notes for combination with C-mount lens
To mount this filter you can use a tweezer or our special tool: VA-TOOL-KNIPEX-CMT-FLT
This filter works with all C-mount lenses we offer, but for some lenses a 1mm extension ring is required
A 1mm extension ring is included when ordering this filter.
When using the lens VA-LCM-5MP-35MM-F1.4-015, the filter inside the camera has to be removed first
Important notes for combination with M12 lens
First remove at your own risk the protective filter inside the camera using this tool: VA-TOOL-KNIPEX-CMT-FLT
Mount the C-mount filter
Use our C-mount to m12 adapter: VA-LADAP-LCM-LM12 to mount the m12 lens
This only works if the back focal length of the lens is larger than 5.9mm. The following M12 lenses are tested ok:
- VA-LM12-12MP-1.85MM-F2.0-018-FISH
- VA-LM12-12MP-03MM-F2.0-017
- VA-LM12-5MP-05MM-F2.5-018
- VA-LM12-10MP-05MM-F2.5-023
- VA-LM12-5MP-06MM-F2.8-018
- VA-LM12-5MP-08MM-F2.8-018
- VA-LM12-5MP-12MM-F2.8-018
- VA-LM12-10MP-12MM-F2.5-015
- VA-LM12-5MP-16MM-F2.0-020 (up to working distance of 2 meter)
- VA-LM12-5MP-25MM-F2.4-020
- VA-LM12-10MP-25MM-F2.5-015
- VA-LM12-10MP-35MM-F2.8-015
- VA-LM12-10MP-50MM-F4.0-015
It does not work with the following M12 lenses:
- VA-LM12-5MP-02MM-F2.0-030
- VA-LM12-16MP-03MM-F2.5-023
- VA-LM12-5MP-03MM-F2.8-020
- VA-LM12-10MP-16MM-F2.2-015