458 WM glass: 1.5-6 or 2.5-10?

1-10x28, 28obj/4pupil = 7x would be optimal.
With large tube come large internals = optimal transmission, when each element is not 100%efficient
works for me, ymmv
 
Large tube means usually more room for adjustment turrets, more range up and down let and right not so much for light transmission. I’m sure it helps but it ain’t the reason for large tubes!
 
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