This was a quick design and had problems. I overlooked the middle open/close ring being taller than the diameter of the lens barrel. So the telephoto ring gear I had to sand... I also had to sand the front-lens support part. I had to sand it a lot... so it would fit.

Then I had problems with the stepper GPIO's interfering with the camera detection for some reason. If they're plugged (ground connected specifically) on boot, the camera cannot be detected, I don't know why.

So I'll put a switch in for that, I know you could do an electron switch, maybe even a relay but not worth it for me.

Now I can actually do the frame by frame analysis to try and autozoom this thing.