Adapter C-mount to M42 and T2 for rpi HQ camera modul V2.0

thingiverse

Adapter to mount old M42 or T2 lens to rpi HQ camera modul. Version 2.0 of https://www.thingiverse.com/thing:4880071 Adapter consists of two pieces: -adapter with C-mount screw -adapter to M42 screw (M42x1) -adapter to T2 screw (M42x0.75) As I was not sure about the flange focal distance of the lens (whichI found on ebay), the two adapter pieces have a screw to adjust the axialy distance. Printing the pieces: Printing scews with a slope of some 1/10 of a mm is no fun. Therefoe I added some clearance to all threads. I used a prusa printer with a layer height of 0.1mm. Srewing the pieces into the cam (an onto the lens) needs delicateness, patience and the right amount of force. Mounting and adjusting: Mount the whole assemly (camera, adapte C-mount, adapter T2, lens) and run the rpi (e.g. with https://elinux.org/RPi-Cam-Web-Interface). Turn lens to infinete metering and use object in far distance for adjustment. Move the two adapeter pieces until you get a sharp image. A screw and a nut (M4) can be used to clamp the adapter. About focal length: Due to the "small" sensor of the rpi camera modul, the nominal focal length of the lens teds towards tele. I used a 35..70 mm and a 90..230mm zoom. 230mm is allmost a telescope. The tower in the images is 100m tall and in a distance of 6.5km. Added some images with different focal length (35, 70, 90, 230mm) and an image of the camera with the tower in the backround (photo taken with my mobilephone). Details on lens, threads and more: https://en.wikipedia.org/wiki/Flange_focal_distance https://en.wikipedia.org/wiki/T-mount https://en.wikipedia.org/wiki/Lens_mount