want to get a new scope for old tired eyes

[TexMax]

Quality of glass! Each scope has a sweet spot also on transmission of light. I can't remember the formula but it has something to do with the objective and eye relief maybe or tube diameter????? Basically something divided by or multiplied by gives you a number for best light transmission on that scope.

'Best' light transmission is at lowest power on every scope.

[Black Ice]

'Best' light transmission is at lowest power on every scope.

Well true. I guess I was trying to say there is a formula that translates to light transmission and it has something to do with the power/ objective lens and maybe exit pupil.

[TexMax]

Lol I know what you were saying. It's obj./mag. Needs to be >= 6 (or 7 seems like there's some dissension on pupil dilation)

[CADDOKILLER]

Same Scope Misconceptions different day

Comes up every day on here.

[Mike D]

Lol I know what you were saying. It's obj./mag. Needs to be >= 6 (or 7 seems like there's some dissension on pupil dilation)

Human pupil dilates to about 7mm in TOTAL darkness.

At legal shooting light it's about 4mm.

Divide the power x the objective diameter to stay at 4 or higher and that's all the light your eye can physically take in.

[Jaycar85]

nah all ya twisted in the game i have a Tasco 3-7x20 on every thing i own from my 1022 to my 50BMG want to spend a little less coin go vortex, but remember you get what you pay for

[TexMax]

Human pupil dilates to about 7mm in TOTAL darkness.

At legal shooting light it's about 4mm.

Divide the power x the objective diameter to stay at 4 or higher and that's all the light your eye can physically take in.

Correct, wasn't getting into practical application. Since we're on the subject any idea what it would be beyond that under say a feeder light from a couple hundred yards or a laser. Obviously total darkness is irrelevant but what would be a practical extreme

[J-J Matt]

If you decide to go Swaro, send me a PM and I'll get you a great deal on one. I'm doing a special until July 4. $75 off Z5's and free shipping to you.

[Mike D]

Correct, wasn't getting into practical application. Since we're on the subject any idea what it would be beyond that under say a feeder light from a couple hundred yards or a laser. Obviously total darkness is irrelevant but what would be a practical extreme

That I don't know. But it's probably safe to assume split the difference at 5-5.5mm.