C5 motorized focusing

The Nexstar mount is not something very solid, and on focusing, the image will shake.  Motorized focusing is a good solution.

I believe a few pictures are better than words, basically, this is a N20 type DC geared motor, plus pulley and belt.

Here is a short video to show the end result, also to demonstrate the backlash of the system.

I will probably add a pulley on the focuser shaft to provide a better coupling.