Excerpt: I live on the west side of a large city in Indiana. I have observed through binoculars most of my life, and am recently becoming quite serious with astronomy. I purchased a pair of Steiner 20 X 80 binoculars (which I am subsequently returning). In daylight there was serious chromatic aberration, but what turned me off the most was the limited diopter adjustment on the right eyepiece. It would not turn as far as the left eyepiece diopter.