What alot of people don't realize is the objective size has more to do with resolution than anything. Whats the use of a 6-24 power when you can't resolve your small target at 500 or 600 yards. And if your not shooting over 500 yards, why get a 6-24 power scope? You can do the same with a 10 power. For a max of 5X, 20mm is fine. Your limiting factor is power, not resolution. For a max of 10 power, 40mm is fine. for 14 power, I would opt for the 44mm. For anything over that, I would opt for the 50mm or larger. Just like the folks who by a 5meg digital camera but with a 10mm or smaller lenses. Why?That objective can't resolve the picture enough to ultilize the 5meg of info on a picture. Try blowing it up. Sure, you got alot of pixels, but they are fuzzy.

The only other thing is 50mm usually gives more FOV. But any shooter that uses a scoped rifle should be able to point thier rifle in a direction and find the animal.

I am sure most of use have bought these powerful 10X binocs with little tiny lenses. Some of us, not naming names probably bought these very poweful 20X with little lenses, but you cannot resolve your animal at long distances with the 20X. But a guy with a 8X50mm binocs can easily resolve the antlers, the points or whatever.