The 56mm objective has 25.44% more area than the 50mm objective. That's huge!
How would you like to get a 25.44% raise in your income?
You can't use any exit pupil larger than your eye's pupil diameter.
However, you could get the same exit pupil diameter at a higher magnification.
I have prooved time and again exit pupil means nothing. An example would be my Minox 13X56 binoulars vs Bushnell 6500 4 1/2-30X50 scope. The binocular has TWO 56mm objectives while the scope has only one 50mm objective. And yet when I set the scope on 13X and compared them on the deer antlers 131 yards away the scope lasted two minutes longer.
I have several comparisons like this. I will include the Minox15X58 binocular smokes the Minox 13X56 by several minutes. I don't see how 2mm objective makes that much difference.
