How to Test Quality of Light box Master Flat?
Hello! I have an SBIG-402 and 8" Meade LX200 classic. I constructed a light box along the lines of Berry and Burnell in "The Handbook of Astronimcal IMage Processing." I noticed that one of the four LEDs seems to cut off before the others as I dim the unit from full brightness.
What would be the bet way to determine whether the LEDs are lit uniformly and that the flat is as flat as possible?
I'd then like to compare the quality flats produced with my light box with twilight flats.
Thank you for your help. Best regards.