Originally Posted by mike33
Thanks, i know thats one heck of a scope wondering about the 6.5x 20 though for light gathering.
The Conquest 4.5-14 and 6.5-20 models both have 50 mm objectives. Depending on your age, your max pupil size is between 5 and 7 mm. Assuming it is 7 mm, the max magnification for fully dark adapted eyes is about 7X. Both models can reach as low as 7X, so there should be no difference I'm brightness at dusk and dawn.
There will be a difference in clarity at 7X, though, because veiling glare increases with magnification range. I would vote for the 4.5-14 model to get better image clarity. Also , 4.5X on the low side gives you a wider field of view and larger exit pupil for faster target acquisition at short range. Unless you are shooting small targets, or over 1,000 yds regularly, 14X on the high side is adequate for hunting big game.