Hi, not a regular here so if this was posted in the wrong forums pls re-direct me, thank you.
I am suspecting the elongated stars at the corner is due to having the wrong backfocus spacing.
Meanwhile I would like to find out what is the additional spacing due to filter use for optolong filters? Does using a filter add spacing distance into the imaging train?
Sample image below. I am currently using a Z61mm equivalent with flattener. Resulting spacing with EFW is 55mm. I've added about 1mm worth of additional spacers as I'm using filters. Should I add more/less?
Edited by cheesified, 22 September 2019 - 03:59 AM.