D
Donald
Guest
Here is something I saved from our neighbors at 6mmBR.com.
TARGET SCOPES
Exit Pupil: Given objectives (front lens elements) of equal size, the more magnification the scope, the smaller the exit pupil.
Too small an exit pupil will make a good scope dim and hard to use.
That's why we advise against boosting the Weaver T-36 or the 36X Sightron.
With their respective 40mm and 42mm objectives, the exit pupil becomes too small when they are boosted beyond 36x.
Absolutely true. I had a booster for one of my Weaver 36's. Yes it made the target a bit larger but being another lens and not a coated lens made the object appear darker. I am sure my old eyes didn't help. Sold it to a fellow shooter next to me at a match and he loves it. He is at least 15 years younger than me. There are no free lunches anymore.
Donald