Does anyone here use pen cameras or something similar on their helmets?

I am still trying to prototype and build a fascimile functional setup.

Go pros are too big.

Edmund optics seems to be a good sources for lenses and adapters.

The kicker I am having is adapting the raspberry pi camera to m12 to c-clip lens sizes which gets you to about an 18mm lens size and the pentax is 18.5mm. (please correct me on the sizes if I am wrong I just woke up and the coffee has not kicked in yet.)

The kicker is to find a modern varifocal lens that works with everything (varifocal = auto focusing)

I am suspecting R&D costs alone are going to cost me close to 2k in wrong parts before I find the correct ones. In my favor is the fact that all the homeland security issues has really cheapened optics and camera costs versus what they were 30 years ago.

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The impossible takes a while longer and goes over budget too...

It was a long time ago, but I did get a working bullet am setup done. Very old tech now compared to what you can do now.

viewtopic.php?f=3&t=4457&p=59103

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A11/TQ1.0.32150E1 Murphy, J - Covert recording headcam. There is no flashing red light when you are on Kona-Cam
Weyland-Yutani: Their projects are intentionally full of bugs. Avoid!

try "mobius" action cams. I have one I'd trade for Aliens stuff theyre open source and tiny. could lose the housing and put it into the helmet cam. might even fit inside as-is