Originally Posted by Driftbuster
What are the advantages of 50mm over a 40mm? His will be a 3x9, or 4x12. Thanks
There is no short way, that I know of, to fully explain the answer for all conditions.
But. . . if shooting at 3 and 4x (lowest power) the difference won't be noticeable . . . much.
Before sun rise and after sun set and at higher magnifications the difference will be very noticeable and always favor the 50mm if a quality scope.