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What determines eye relief in a scope?

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/02/2016 at 20:38
tpcollins View Drop Down
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Some scope may have 4", a .22 rimfire scope may only have half that because of no recoil. What determines eye relief inside a scope?


I have no idea what this crap at the bottom is from. 







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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/02/2016 at 20:46
Son of Ed View Drop Down
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The way the lenses are arranged.  
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/02/2016 at 21:07
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Originally posted by Son of Ed Son of Ed wrote:

The way the lenses are arranged.  

and cut or shaped

but i am not buying the idea that recoil alone determines how much eye relief is needed. Type of firearm, type or mounts, stock size and shape, etc, are also important.
the rifle/scope have to fit for good shooting
when my daughter was young and small she shot and adult sized .22 riffle with 5" ER. 

i have a Sako that i initially scoped with low rings and a scope that had between 3.2 and 3.5" of eye relief, depending on power on the zoom. As soon as i moved away from the bench, i could no longer hit anything with that rifle, and the recoil was brutal even with mild reloads. I have since put a scope with 4" of constant ER and high rings, i shoot that rifle well and fast with both eyes open and the recoil is no longer a problem. If it does not fit, it will not shoot.  

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/02/2016 at 22:34
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Thanks for the reply. Due to a torn rotator cuff, I've had to switch from a compound bow to a crossbow. Most of the scopes available are somewhat modified rifle scopes that have reticles with subtends for various yardages. And these scopes usually have the traditional 4" eye relief which puts the scope further down the rail. 

Maybe someday the scope manufactures will make a dedicated crossbow scope without the longer eye relief. Thanks for the info.


What's causing this at the bottom of every one of my posts on this forum?  




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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/03/2016 at 05:21
verminator View Drop Down
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eyebox size in relation to objective size seem's to have a impact on eye relief. also i would have thought the way the scope is assembled internally would play a major role. here is a example off the only 80 x rifle scope in the world WOW..https://www.youtube.com/watch?v=03qtXpoObfM&feature=related 

Edited by verminator - January/03/2016 at 05:54
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/03/2016 at 06:57
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Originally posted by tpcollins tpcollins wrote:

Some scope may have 4", a .22 rimfire scope may only have half that because of no recoil. What determines eye relief inside a scope?


I have no idea what this crap at the bottom is from. 







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U probably have an ebay toolbar or addon installed in your safari browser. My ebay manager. Sometimes things like that dont aggree with the forum software.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/03/2016 at 11:25
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Eye relief is a function of the optical design of the scope: number, shape and arrangement of the optical elements inside a riflescope.

ILya
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