A-mount to C-mount lens adaptor

I designed this basic adaptor to mount a Minolta AF lens onto the Raspberry Pi HQ C-mount sensor.

It incorporates a simple manual aperture control lever.

Update 1: Changed the flange mount to hold the lens a bit tighter and added a small nub to lock it in place.

Print instructions

There are 4 parts which stack on top of each other joined by 2mm self tapping screws. The print is split into these sections to allow printing without supports as there are fairly tight tolerances required. To that end I also printed it at 0.1mm, but doing this on SLA would probably be even better.

It's a good idea also to sand down and paint the inner portion of the mount matt black. even if you have black filament, to reduce reflections inside the extension tube.

After my first test I realised my lens needed a bit more rear focal length so I also included a rear C-mount with an additional 5mm length. I simply made use of the 5mm extension that came with my lens but even so I needed a good helping of extension on the rear focus ring so this should help with that, or you could extend it even more to give yourself more room to play. Being able to dismantle the mount and change it up should help with that which is also why I chose to use screws instead of a single piece or glue.