Shodd,
A leupold 6X42 offers as good of light transmission as the human eyeball is capable of.
42÷6= 7 mm exit pupil
Do yourself a favor. Lay out your 6X42 and any good variable with 10X or more on the top end. Put them on sand bags. Aim them at some visible deer antlers in some bushes or trees about 100 yards away as the sun sets. Mark the time when you can not longer discern the points with the 6X and then look thought the other with it set on 10X or more. You will make the same discovery everyone who has tried this made.
My 6500 4 1/2-30 has a
50mm objective. My Minox 13X
56 has
TWO 56mm objectives and yet it looses out two minutes before the 6500 when it is set on 13X. Switch to the 4200 4-16X
40 and put it on 13X and gain an additional couple minutes over the Minox 13X
56. Magnification of good enough glass trumps exit pupil
EVERY time.
