For low light shooting is a 50mm objective better than 40 or 42 mm objective?
What are the best scopes for low light shooting?

Not necessarily. It depends on glass quality, coatings, and yes, exit pupil. BTW, welcome to the forum.

What he said....... The Zeiss Diavari 3x12x56 would be hard for you to beat for low light shooting.

If a low light conqueror is what you want, Timbercruiser hit a homer! For sure any such "sized" scope will be heavy, bulky and require you to have your head pretty well up off the stock. I had a more or less equivalent Kahles that came on a used 300 WSM I bought. It had a heavy plex and an illuminated reticule. I sat many an evening, well after nightfall, with full to 1/2or so moon and had no problem seeing a good deal of detail (such as antler, ears, eyes, etc.) at 200 yards on a food plot. I sold the scope a couple of years back because it was just too big and heavy for my style of hunting.

And as BugsNbows stated, low light performance is directly dependent upon the highest quality glass, precision grinding and highest tech coatings on the market.

I too would go with the 2nd post. It depends on my things like glass and pupil.

Some info for you;


http://www.chuckhawks.com/overview_burris_optics.htm