I buy from this company, they sell DIY Robot parts. They just announced a cheap LIDAR Range Finder sensor safe for eyes that can range to 12 ft. Which could be built into a system to AF a big camera. FOV is 27 degrees which can be tightened.
12 feet is enough, for now. Combine this part with a processor, off the shelf stepping motors and a simple program. Use a lead screw.
I cannot start the project yet, I need to finish a dozen other projects first...
https://www.pololu.com/product/3415?...180501_vl53l1x
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