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".
MSM30---Micro Touch Focusing System - Stepper Motor for 2.5" and 3" Feather Touch focusers, and 2,7" Astro-Physics Focusers Extra stepper motor unit for the MicroTouch ...
Lacerta OCTO-PLUS 2-inch eyepiece slide for Newton (guided on 8 ball bearings, with 1:10 microfocus unit and 2" self-centering eyepiece sleeve), for 10inch tube
Lacerta OCTO-PLUS 2-inch eyepiece slide for Newton (guided on 8 ball bearings, with 1:10 microfocus unit and 2" self-centering eyepiece sleeve), for 8 inch tubes
Starlight Instruments HSM30 Handy Stepper Motor with manual focus over-ride... stepper motor also for manual movement for Focuser Boss II - for 2,5" and 3" Feather Touch focusers
Starlight Instruments HSM20 Handy Stepper Motor with manual focus over-ride... stepper motor also for manual movement for Focuser Boss II - for 2" Feather Touch focusers
MSM20---Micro Touch Focusing System - Stepper Motor for 3,5" Feather Touch focusers and 4" AstroPhysics Focuser Extra stepper motor unit for the MicroTouch Autotelescope focuser...
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 ...