Easy Centering of a Scope's Adjustment Dials with a Mirror - Page 2 - Graybeard Outdoors
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post #11 of 24 (permalink) Old 09-17-2008, 09:13 PM Thread Starter
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Default Re: Easy Centering of a Scope's Adjustment Dials with a Mirror

Glad it worked for ya, it's saved me a bunch of time fiddling with scopes, that's for sure!!

Tim

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post #12 of 24 (permalink) Old 09-18-2008, 09:16 AM
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Default Re: Easy Centering of a Scope's Adjustment Dials with a Mirror

I fired six shots in pairs of two on the quick 25yd sight-in and the Scope adjustment Gods must have been with me as the last two went into my target area of perhaps 1/4" square.
(Please note that there is only one God)
I noticed that the three pairs of two holes were either touching or overlapping...I knew that the scope was accurate but could not remember it doing this before so the centering may have enhanced the accuracy....I will have to try this on the 50yd range to be sure but it was one of those rare occasions that I had ran out of shells!
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post #13 of 24 (permalink) Old 01-25-2009, 06:02 PM
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Default Re: Easy Centering of a Scope's Adjustment Dials with a Mirror

Thanks for the information. I thought I would test it by pulling an old scope out of the drawer. I choose to use a bathroom mirror because it has three light bulbs over the mirror. I was greeted by the image of two sets of crosshairs. A few minutes later I adjusted it to one crosshairs.

My next step was to call a brother and tell him about the process. I would not be surprised if he has pulled out a scope and is checking it in the mirror. His young son must think he has gone over edge. And there maybe a lesson in it for him.

Thanks again.

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post #14 of 24 (permalink) Old 05-24-2009, 05:26 AM
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Default Re: Easy Centering of a Scope's Adjustment Dials with a Mirror

I tried it on a Burris that I had on two other pistol barrels. Worked for me.

Tom
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post #15 of 24 (permalink) Old 01-16-2010, 01:29 AM
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Default Re: Easy Centering of a Scope's Adjustment Dials with a Mirror

This one needs a bump...Thanks Tim, had always wondered where my second hand Tascos were at...great tip!

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post #16 of 24 (permalink) Old 01-16-2010, 10:28 AM
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Default Re: Easy Centering of a Scope's Adjustment Dials with a Mirror

You can count the clicks, which is more accurate, but the mirror method is much faster to get the scope close to center. I've used both methods and the mirror method is very close.

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post #17 of 24 (permalink) Old 02-23-2012, 08:23 PM
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Default Re: Easy Centering of a Scope's Adjustment Dials with a Mirror

Counting clicks ? just mark your starting point and count the revolutions then devide in half. You must start at the very end, one way or the other, of course. Also that's mechanical center, you must do the mirror trick, for optical center. Sometimes they do come out different
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post #18 of 24 (permalink) Old 02-23-2012, 09:40 PM
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Default Re: Easy Centering of a Scope's Adjustment Dials with a Mirror

I swap scopes alot between my Tenders and Encores, great tip!

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post #19 of 24 (permalink) Old 01-01-2017, 01:46 PM
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I just did the mirror method with two scopes, both of which I had already counted total clicks, then came back half way.

Both were 6 clicks or less, in both directions.

So, thinking out loud, if a scope is off center by 1.5" at the objective lens, does anyone know what that translates to at 100 yards? I'm thinking that simple trigonometry applies here, but I am not sure, as I am not totally sure about the internals of scopes, especially, brand to brand.

Also, does 4" off of the bullseye, at 50 yards, translate to 8" at 100 yards? I'm pretty sure the answer is yes, based on trig, but I want to have all of my ducks in a row, as I troubleshoot a possible drill and tap issue, which I first was told, was a scope issue. My newly acquired cartridge bore sighter, will hopefully help resolve things.

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post #20 of 24 (permalink) Old 01-01-2017, 04:03 PM
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The trig works for windage, and it would for elevation if there where no bullet trajectory to account for, so yes, 4"@50yd pretty much is 8"@100yd. for all practical purposes.
I dont quite get your 'off by 1.5" at Obj. Len = [email protected]' example. Do you mean your POI is off by 1.5" @ 100yd. from your POA and how many thou' does that equate to at the scope mounts/bases?

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