A good focuser is just as important as the optics. Electronic focus control and precise mechanics are a must, especially for astrophotography. Here you will find a large selection of suitable "hardware".
MKIT20---Micro Touch Focusing System - 2 Piece Kit(hub/hand control and motor) for Control of 2.0", MPA Retrofits, and Micro Feather Touch Focusers - WIRED -
MKIT30---Micro Touch Focusing System - 2 Piece Kit(hub/hand control and motor) for Control of 3.5" Feather Touch and 4.0" Astro-Physics Focusers Micro Touch Focusing System
MKIT30---Micro Touch Focusing System - 2 Piece Kit(hub/hand control and motor) for Control of 2.5", 3.0" Feather Touch® and 2.7" Astro-Physics Focuser Micro Touch Focusing System ...
FTM-C9.25---Feather Touch® Micro Focuser for Celestron C-9.25 Schmidt-Cassegrain Telescope Feather Touch® Micro Telescope Focuser for Celestron C-9.25 Schmidt-Cassegrain TelescopeTwo Versions of the Celestron C9.25 : If your telescope is less than a few years old, check the style of the back cell to see which version of the Feather Touch® SCT Micro Focuser you need: If your telescope has a flat back (left picture), you need the standard "C" Micro Focuser. If your telescope has a triangular pattern on the back (right picture), you will need the "CPC" version of the Micro Focuser. Delivered with: Starlight Micro Transmission for Celestron C9,25
MSM20---Micro Touch Focusing System - Stepper Motor for 2.0" Feather Touch focusers, MPA, Televue, Takahashi retrofit focusers, and SCT Micro Feather Touch® Focusers Extra ...