Remote focus control for telescope (remote follow focus)

The chips in the control circuit are:

Avago HCTL-2032-SC quadrature decoder
E-lab EDE1200 stepper control
Generic 558 timer for simple oscillator








Hi-res version


Moon at f/6.3 1/320 at ISO100. The lens is approx 1260mm (telescope with focal reducer).



Composite shot of Jupiter with its moons.