Hi all,
I photograph with a Nikon D5500 connected to a 10" F5 dobsonian on a DIY EQ platform. Recently i changed the bolts to move my primary mirror up the tube in order to achieve focus with my DSLR with out using a 1.5 barlow.
After doing this i feel like the vignetting has been a lot worse when stretching the image but i'm unable to compare to my old images as they are on a HDD in storage at the moment.
Can moving the mirror up cause more vignetting? or does the 1.5 barlow crop out some of the vignetting?
below is a link to an unedited stack (sequator) and a a single light frame. Just wondering if this seems nomral or excessive after the stack is stretched?
https://drive.google.com/drive/folde...IH?usp=sharing
Thanks Every one,
Greg