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An enhanced iron sight

Started by FiremanBob, July 28, 2014, 10:44:22 PM

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FiremanBob

July 28, 2014, 10:44:22 PM
My favorite 10/22 has a Williams FP rear aperture and a Lyman 17A front sight. I have been thinking for a long time about giving up the iron sights as my aging eyes made it quite difficult to see the front sight clearly, no matter how hard I tried to focus on it.

A student a few months ago had a large eyecup on his rear sight; he told me it was a Merit adjustable iris, the advantage of which is that like a pinhole camera, it has a long depth of field. Found one at Brownell's ($44 with my instructor discount) and tried it for the first time this weekend. Sure enough, both the front sight and the target were in clear focus! Depending on your eyes and the light conditions, you can adjust the size of the rear aperture from .022" to .125".

I may have a few more years of iron-sight shooting left in me after all.  Of course, it doesn't fit on Tech-Sights or Nodaks, but should work on Redfield, Lyman and other sights with the same threads as the Williams.
Author of "The 10/22 Companion: How to Operate, Troubleshoot, Maintain and Improve Your Ruger 10/22"

"Remember constantly that a nation cannot long remain strong when each man in it is individually weak, and that neither social forms nor political schemes have yet been found that can make a people energetic by composing it of pusillanimous and soft citizens." - de Tocqueville

eaglescouter

#1
July 28, 2014, 11:17:03 PM
And Merit now makes one of these specifically for an AR platform rifle:

http://www.meritcorporation.com/via.html

Old Guy:  Do it long enough and you get really good at it.

Rifleman:  Sacramento:  Four Ought Nine
Full Distance:  Red Bluff:  What year was that?
Pistoleer:  Hat Creek:  Three Twenty One

Make yourselves good scouts and good rifle shots in order to protect the women and children of your country if it should ever become necessary.
--Lord Baden-Powell
Scouting for Boys (1908)

Guntuckian

#2
July 28, 2014, 11:27:16 PM
Pinhole camera theory can work great under bright light conditions!

For anyone with vision issues, take a sheet of aluminum foil, make a small pinhole, and look through the pinhole without using your glasses.  One's blurry vision suddenly becomes very sharp looking through a single pinhole in a brightly lit area!

It works by eliminating all the other blurred images save but one!

The drawback is that you only get one image, instead of hundreds of correlated images, and the image brightness is greatly reduced.  But, the depth of field is great!

In the days before the invention of glasses, pinholes were used by some (monks, mostly), to be able to continue to read.  These poor fellows could only read around mid-day.  Reading by candlelight was not possible with pinholes!



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1st Appleseed:           04/20/2013 - Palm Bay, FL
Rifleman:                   02/01/2014 - Palm Bay, FL
Cleared 1st Redcoat:   02/02/2014 - Palm Bay, FL
1st KD:  Palm Bay 8/14
1st IBC:  Dunnellon 4/15
Palm Bay 4/17 KD Rifleman
Palm Bay 10/20 Rimfire KD Rifleman
NRA Certified (Rifle and Pistol Instructor, RSO)

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Unbridled Liberty

#3
July 28, 2014, 11:38:37 PM
Reminds me of this thread in the Adaptive Appleseed area: http://appleseedinfo.org/smf/index.php?topic=14010.0

UL
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