Low light scope

[dans]

Is there any advantage in brightness clarity with a 50 or larger diameter objective lens over something smaller. I am not rich and favor lower priced scopes. I prefer Leupold but am flexible.

[sw]

Most consider 5mm /power as the maximum brightness that the eye will see thru a scope. So, a 40mm at 8x will be as bright as a 50 or 56 at 8x. However at 10x , the exit pupil will be down to 4 with the 40 (40/10=4) but still at 5 with a 50mm (50/10=5). Many higher power scopes have 50-56 mm but start to get dimmer, for most people, when the exit pupil starts going below 5.
Example, I have a Zeiss Duralyt 42 mm 2x8 on my SWAT . It is as bright, in virtual darkness at 8 as it is at any lesser number.
Hope this helps.

[jp8775]

Dec 20, 2019 11:06:17 GMT -5 dans said:

Is there any advantage in brightness clarity with a 50 or larger diameter objective lens over something smaller. I am not rich and favor lower priced scopes. I prefer Leupold but am flexible.

Anyone using the sig BDX?