Usb microscope made from the old soviet era camera lens with M42 mount and not so old webcam.

I was thinking about the usb microscope for smd soldering for some time now, but wasn't really happy with their price / quality and their distance form pcb when set up. So decided to take hacker way and use what was lying around in a junk box.

I've used one M5 threaded rod, some nuts, washers, wooden board.
One webcam.
One camera lens.

Printed parts list:

• the lens - camera ring adapter (you should model it for your own camera/lens models)
• clamp for holding camera with lens vertically
• nut wings for easy tightening
• 90 degree arm mount - to mount the camera.

I've also found that you can reverse original web-camera lens for macro photography, but found the focusing distances unusable.

The red box in the third photo marks the place of the second photo (through microscope).

UPDATE

Now I mounted lens (K mount) from my old Pentax camera. It's easier to focus and gives me a bit sharper image
I'm adding stl and Fusion 360 file (for modification). Last pcb closeup made with this lens.