# Replacing filter in C1 and C1 PRO cameras

C1 and C1 PRO cameras can be ordered with filter options:

- LP0508-P0050 650nm short pass
- LP0508-P0051 850nm long pass
- No filter
- Custom

In order to replace a only some basic tools and possibly optics cleaning materials and consumables are needed.

- - - - - -

Make sure camera is clean so dust particles will not be transferred on a filter or imaging sensor.

[![c1_filter_1.png](https://wiki.kurokesu.com/uploads/images/gallery/2021-04/scaled-1680-/c1_filter_1.png)](https://wiki.kurokesu.com/uploads/images/gallery/2021-04/c1_filter_1.png)

- - - - - -

Unscrew 4 DIN912 M2.5x10 screws (recent models were updated with Torx T5 screws) and remove back plate

[![c1_filter_2.png](https://wiki.kurokesu.com/uploads/images/gallery/2021-04/scaled-1680-/c1_filter_2.png)](https://wiki.kurokesu.com/uploads/images/gallery/2021-04/c1_filter_2.png)

- - - - - -

Unscrew 4 DIN912 M2x5 screws holding PCBA

[![c1_filter_4.png](https://wiki.kurokesu.com/uploads/images/gallery/2021-04/scaled-1680-/c1_filter_4.png)](https://wiki.kurokesu.com/uploads/images/gallery/2021-04/c1_filter_4.png)

- - - - - -

Carefully flip camera holding everything together. Then lift front plate. Filter is resting on silicone spacer. Filter nor spacer is not glued, but will be slightly bonded to each other.

[![c1_filter_5.png](https://wiki.kurokesu.com/uploads/images/gallery/2021-04/scaled-1680-/c1_filter_5.png)](https://wiki.kurokesu.com/uploads/images/gallery/2021-04/c1_filter_5.png)

- - - - - -

Remove filter with tweezers and replace with new one. Inspect optical path for possible dust. Clean if needed.

[![c1_filter_7.png](https://wiki.kurokesu.com/uploads/images/gallery/2021-04/scaled-1680-/c1_filter_7.png)](https://wiki.kurokesu.com/uploads/images/gallery/2021-04/c1_filter_7.png)

- - - - - -

Assembly camera in reverse order.