Originally Posted by
barrel-nut
As a general rule, the above is correct. But the quality of the lenses and the coatings on the lenses also plays a huge role. I have a few cheap 50mm objective scopes that are terrible in low light, much worse than some higher quality 40- and 42-mm scopes I have. To some degree, you get what you pay for in optics. But there are several good choices in the $150-200 range, with the Burris the OP mentioned being my favorite. My only gripe with the Burris models is that I have found their lens coatings to be rather fragile, as in easily scratched. But they have also recoated (or replaced?) one of these lenses under warranty for me with a three week turnaround time, including shipping. Very good customer service. Just my opinion though. YMMV.