I currently have a Nightforce ATACR 1-8 and I am having a problem with adjusting the diopter. I adjusted the diopter on 1X by focusing on some trees about 25 yards away. I got the image pretty flat and could see a crisp dot and circle when the reticle was illuminated. The problem that I have is when zoom up to 8X the image is not crisp as would like. When I adjust the diopter on 8X and get the image crisp, I loose my flatness on one power. I compared the ATACR image on 5X with my Eotech with a 5x magnifier and the Eotech was clear and brighter. How do I get the image flat on 1X and crisp at 8X? Is there a problem with my ATACR? Been fooling around with this way too long.