Here is some good info from the webs, I sit corrected & BTW for you that suffer from ADD is ten min. read.
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I have a VX5HD with a 56mm objective and a 30mm tube. You can dang near hunt at night with it on open fields.Not arguing, but I can count points with my Zens when you can't even see a deer in an open food plot. Just my experience. If a scope will out perform that, I need to go shopping.