I can never remember the letter settings for each EP so I just set it somewhere in the middle, except for big EP's with filters which will touch the glass if not extended a bit. That's on an f4 dob, never noticed any coma with it even in 100° EP's
We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. By using this site, you agree to our Terms of Use.