Forums
New posts
Search forums
What's new
Articles
Latest reviews
Author list
Classifieds
Log in
Register
What's new
Search
Search
Search titles and first posts only
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Hunting
Extreme Long Range Hunting & Shooting (ELR)
Why are more expensive scopes so much brighter at high power?
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="chutinlead" data-source="post: 2903080" data-attributes="member: 112603"><p>I dove down a slightly tangential rabbit hole not too long ago. A young adult say 20 years old with perfect eyes has a pupil that is able to dilate to roughly 8mm in total darkness in a normal state. That value increases with adrenaline. </p><p>So if you look at the exit pupil on a scope, say a 80mm spotting scope, the exit pupil is roughly objective size divided by magnification. So for your roughly 40x sweet spot 80mm/40x=2mm exit pupil. </p><p>Obviously old eyes don't dilate as well so a 40yo might max out at 6mm. 60yo at 5mm.</p></blockquote><p></p>
[QUOTE="chutinlead, post: 2903080, member: 112603"] I dove down a slightly tangential rabbit hole not too long ago. A young adult say 20 years old with perfect eyes has a pupil that is able to dilate to roughly 8mm in total darkness in a normal state. That value increases with adrenaline. So if you look at the exit pupil on a scope, say a 80mm spotting scope, the exit pupil is roughly objective size divided by magnification. So for your roughly 40x sweet spot 80mm/40x=2mm exit pupil. Obviously old eyes don't dilate as well so a 40yo might max out at 6mm. 60yo at 5mm. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Hunting
Extreme Long Range Hunting & Shooting (ELR)
Why are more expensive scopes so much brighter at high power?
Top