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Join Date: Jan 2010
Location: Southcentral PA
Glass quality and coatings trump both objective size and magnification. At night you are going to want the best glass you can afford. The next consideration is that you want the exit pupil (obj diameter/magnification) to be at least as large as your fully dilated pupil (4-7mm for most).
A 6-20x50 has an exit pupil of over 8 at when set on 6x. Here's the problem, though. Unless you have an unlimited budget, which few of us do, you are going to be sacrificing glass quality at every price point to get the extra magnification and objective size. For that reason, you are almost guaranteed to be better off with a 3-9x40(or 42 or 44) than something higher powered.
For example, a vortex viper 6.5-20x50 and a meopta meopro 3-9x40 are both going to cost close to $500. Your better low light performance will be in the Meopta. I would argue that the better overall performance would be the Meopta as well unless you are shooting small targets at long range in full daylight.
Last edited by ROVERT; 01-29-2018 at 09:07 AM.