Logitech C920/C922 - M12 / C Mount / 1.25" rework

thingiverse

I've created this reworked C922 case so I could use a C mount to 1.25" telescope adapter with an IR cut filter and use the webcam for planetary and lunar imaging. I've made the distance from the mount to the sensor according to the C mount specifications (Not CS mount, see update below) so it should in theory work with those lenses, however I don't have such a lens to try it with. I did try with a C mount to EF mount adapter, which worked. Additionally, there is an M12 lens thread on the inner part of the body that should accept standard M12 style lenses. To fit this case you need to remove the USB cable temporarily (The case uses the original USB cable and stress relief) and unsolder the grounding pin and auto-focus leads on the standard lens. If done properly this should be completely non-destructive. I've made the back cover with a hole to fit a heatsink I had on hand that is sandwiched against the back of the PCB where the sensor is, the original case also has a small heatsink in this position. If you're doing this mod you should also put some sort of heatsink in this position as the sensor gets quite hot. I used self tapping screws I had laying around to secure the back cover so I don't know what size they are exactly, but I've made the holes 3.4mm in diameter, which made for a tight fit with the screws tapping their own threads. the rest of the screws to secure the PCB to the case are reused from the webcam itself. Update: There is also an experimental CS mount body, however this would require unsoldering the standard USB header and attaching the wires to the back of the PCB. I have not tried this yet but let me know if you did!