Gotbuck
For evening right before closing time you need to have a 40mm or 50mm lens, it is like daylight looking through them then you would be certain of your shot
Not always true... the ability of the scope to transmitt light is a factor of the quality of the lens and the power of the scope. If you divide the power you are using into the size of the objective it will give you the light figure..
Example... 3x9x40 - on 3 power you get a factor of 13.3 and at 9 a factor of 4.44
On the other hand a 2x7x32 the factors are different...
on 2x power the factor is 16 meaning more light is transmitted
on 7x power the factor is 4.57
But yet through the range of powers - your suggestion is correct for a normal 32mm 2x7 scope. But if you had a Swift Premier 2x7x40 - there is a ton of light available in that one.
so in this case everything being equal the 2x7 actually transmitts more light on the low end of the power range... Again proving Cayugad knows what he is talking about when he suggests 2x7's all the time... I still prefer the 3x9 though because I get a bigger field of view on all powers.
RW stuck me with this treasure of a fact... one of the few things he was actually right on and did not goet paid for.