An electric focuser is almost essential if you want to stop your telescope from jiggling about while making fine focus adjustments.
The Skywatcher electric focuser gives you variable speed adjustment and runs from a 9V battery (supplied).
It is easily fitted to Skywatcher, Saxon and some Celestron and Orion rack and pinion focusers.
Very useful if you have a large telescope on an undersized mount - at a fraction of the cost of the correct sized mount.
Just released by Skywatcher we have the electric focuser available at an unbelievable introductory price.