I am wondering if someone can shed some light or similar experience
I am currently using a 14 inch gso RC along with Atik 16200 ccd ( ewf3 FW) standard gso focuser
I have noticed that my stars are not fully round but appear to be slightly chopped off. I’ve Checked for obvious obstructions or tilt... my initial thoughts were the focuser sagging as I have at least 50mm extension tubes to bring the equipment into focus ( camera to Focuser)
If you have a look at the top off the dubhe image around 12 o’clock there is a black mark which looks similar to the star shape.
I’ve collimated various time’s and shape appears to be be the same off the star.
I wonder if my secondary is a little out
Edited by gustavo_sanchez, 12 February 2020 - 07:39 AM.