A 56mm scope will let you see at 56 yards exactly what a 50mm scope will let you see at 50 yards and exactly what a 42mm scope will let you see at 42 yards, all else being equal scope wise. Any other way to compare different size scopes is subjective to ones eyeballs, light conditions, etc
The above is half the picture. The other half is the reticle�
If one can hunt all night long with a 56mm scope, I would guess he can hunt all night long with an equal quality 50mm scope, he just needs to get 1/10 of the way closer.
Aic
Based on side by side comparison I find this impossible to agree with.
