I did a check of my RCC1 imaging train with my old 8" f6 Newt.
& compared it with the new 10" f4 Newt.
Imaging train is here:
https://www.flickr.com/photos/247194...in/photostream
What a surprise - the flats from the old Newt. are no better.
I include stretched pictures to more easily see the problem.
It's a surprise as the KAF8300 sensor only has a 22.5 mm diagonal -
that's only 11.25 mm off axis - not much!
Can anyone else post their flats in a similar way for comparison please?
cheers
Allan