Advanced Marksmanship Scope shadowing effects?

[m1ajunkie]

I was shooting yesterday at the local range and another shooter was discussing scope shadowing and how it effects the poi of the round.

I am confused about what exactly the "shadow" is. Is the shadow the black that comes into view when you get your head pretty far out of the center of the scope or the grey that I can see when I'm not really close to the center of the optic?

I have been using slightly tinted shooting glasses and never notice the grey shadow except when I remove the glasses and look through with my naked eye.

How much, and what kind of effect does this shadowing have on shots? I feel like I was getting good advice, but I wanted to be sure this isn't something that most people don't think about.

 

[Graham]

Re: Scope shadowing effects?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: m1ajunkie</div><div class="ubbcode-body">I am confused about what exactly the "shadow" is. Is the shadow the black that comes into view when you get your head pretty far out of the center of the scope or the grey that I can see when I'm not really close to the center of the optic?</div></div>Yes. It's when your eye is not aligned with the scope. You should see a crisp image with no 'quarter moon' blackness on any edge.

The point of impact will move away from the shadow.

 

[George63]

Re: Scope shadowing effects?

If the AO is set right on, then moving the eye around slightly is not critical but the #s on the scope are not perfect especially on a side adjust so putting the eye at the center takes out another variable

 

[Sterling Shooter]

Re: Scope shadowing effects?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: George63</div><div class="ubbcode-body">If the AO is set right on, then moving the eye around slightly is not critical but the #s on the scope are not perfect especially on a side adjust so putting the eye at the center takes out another variable</div></div>

Getting a consistent eyeball/eyepiece relationship is useful for a mulitude of reasons, all about hitting where aimed. But, mostly, proper alignment minimizes parallax error. This error, being angular, increases with distance. I've seen ACOG error as much as 18 inches or thereabouts at 600 meters. Of course, this scope has no parallax adjustment, so minimizing error through a consistent stockweld/eyeball/eyepiece relationship is essential, if hitting a distant target is the desired result.

 

[George63]

Re: Scope shadowing effects?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Sterling Shooter</div><div class="ubbcode-body">

Getting a consistent eyeball/eyepiece relationship is useful for a mulitude of reasons, all about hitting where aimed. But, mostly, proper alignment minimizes parallax error. This error, being angular, increases with distance. I've seen ACOG error as much as 18 inches or thereabouts at 600 meters. Of course, this scope has no parallax adjustment, so minimizing error through a consistent stockweld/eyeball/eyepiece relationship is essential, if hitting a distant target is the desired result. </div></div>

+1 on the acog, for me an 80$ scope does better than an 1000$ acog