That depends on which rifle scope, which binoculars and if your eyes can see the difference. I have an excellent 8X42 Leica BA that has always worked in any twilight, even full cloud cover days w/o any moonlight. But my 6X42 rifle scopes always work in full darkness, when the Leica binocular does not. Why ? Because the 6X42 has a 7mm exit pupil and my vison still has all of it's night capabilities.
Now, I'm sure if I had the 8X56 Zeiss binoculars I once owned, they would work even better than the 6X42 rifle scope. Why ? Two eyes allow more depth perception. And an 8X always allows one to see further under bad light conditions than a 6X. E
Makes sense to me. There is, IMO, a reduction in depth perception with increasing power, and I'm guessing 7x is the sweet spot. I think this is why 7x50's were the standard in bygone years, especially for nautical stuff.
