Rifle Scopes Exit pupil question

[conksarmy]

Shopping for a high end hunting scope... I understand that beyond glass, brightness is largely a function of the size of the exit pupil. Maybe that isn't true, help me understand...

Assuming that I understand correctly, will a say Swarovski z6i 2.5 -15 x 56 at 15x be brighter than a Swarovski z6i 5-30 x 56 @ 15x or is there some thing that causes it to be less bright/clear?

If weight is comparable and price similar wouldn't the idea be to go 5-30 so if needed you would have the extra zoom in a target or observation situation?

 

[dustingaunder]

Koshkin had a good video on exit pupil.

 

[ZG47A]

You should definitely watch that video. More and better info (and in fewer words) than I have ever seen in a magazine article or book. I recommend that you also watch his video entitled Apparent FOV. Same story, as in more and better info in the minimum of words. Nothing beats professional advice, especially when the advisor is a professional testing engineer in that field.