[el_draco (Rom)]

Originally Posted by torsion

Hi,

Would anyone know the distance the primary mirror travels per turn of the focus knob on the back of a Celestron Edge HD scope?

This would be the pitch of the focus screw, I would assume. Next step will be to take off the rubber nob and see if I can make the screw stick out to measure the pitch.

I am in the process of installing a motorised focusser and need to select a stepper motor. Just wondering if I can get a straight one or one with gears (few or lots).

Thanks in advanced.
cheers,
Bram

Have you thought of using a motorised micro-focuser from Starizona? The retrofit takes minutes and the fix is excellent.

See here: http://starizona.com/acb/Feathertouc...sers-C654.aspx

Rom