I'm having a problem getting proper focus and good stars with a Celestron 9.25 EdgeHD with 0.7x Reducer installed. When I set the back spacing, from the Reducer, to the specified 146mm I can just reach focus; the focus knob is at the end of travel. However, after taking an image at that spacing and examining the stars, the stars around the perimeter are radiating outwards, indicating that I must increase the back spacing. But if I increase the spacing I wouldn't be able to reach focus! Am I missing something here, or is this the way things are with the 0.7x reducer?
Edited by Terroll, 08 September 2021 - 04:35 PM.