Want to use aperture or Tech Sights, but think your eyesight just won't cut it? Please read on, while I explain my journey from a scope to Tech Sights.
Some background:
* I'm 57 years old
* I've worn glasses since I was 10 years old
* definite astigmatism
* I've had bifocals for ~ 15 years
* I've been "taught" that I cannot shoot well with anything other than a scope
* qualified Rifleman using a scoped Ruger 10/22
* I want to shoot M1 Garands, like a Rifleman ( marksmanship matters ! )
So, you might ask, how bad is your eyesight? I'll assume that everyone has experienced at least a basic eye exam. You know that first line, one letter, the big "E"? I know its there, but I can't read it! (If the Drs. on the list would like to know my prescription, I'll post it.)
Now for my journey. Once I accepted the Orange hat, I decided that it might be of benefit to learn what others might be dealing with on their learning curve, such as shooting with the popular Tech Sights. First, I had to overcome the lie that I could not shoot well unless I used a scope. I was determined to do my best (guess this is where Fred would talk about self improvement ;) ). Then I found that I had two additional problems - sight alignment and focusing on the front sight. I fought with sight alignment for a while, and thought I was getting it down, but without having a good front sight focus, I could not be sure (talking targets). That's when I started thinking of how I could make a smaller aperture, which I believed might help bring the front sight into focus more easily.
(Those older souls amongst us might recall pinhole cameras.
see http://en.wikipedia.org/wiki/Pinhole_camera which might help in understanding why I thought of the smaller aperture. )
After measuring the TS aperture, I decided to find a "temporary" solution, one that would be easily reversible if it did not work. I purchased two small drill bits; one was a #60 (.040") and the other was 1/32" (.03125"). I used my Dremel tool to cut a piece of .22 lr brass, flattened it, drilled the small holes, then cut the brass into two pieces. With the .040 brass, I used some tape to attach it to my sight. I didn't worry about zero, but simply shot groups. IT WORKED! A side benefit was that sight alignment was easier, too. With a smaller aperture, there is less room for error in alignment. So I now had a front sight that I could bring into focus, sight alignment was easier, and the targets were talking a bit nicer to me. :) (I still had some other steps to firing the shot that needed work, but that simply takes practice/persistence.) But I did not stop there. I still had the 1/32" piece of brass, so why not try it, too. Worked even better! I now had a decent depth of field (I think that's the right term) and the target seemed sharper for step 4b (focus your mind on keeping the front sight on the target). I then epoxied the small aperture to the Tech Sight and rezeroed.
Problems in practice sessions:
At The Waterman 300, I was a shooter the first day. You know the routine - 4 moa BLACK squares. I emphasize BLACK because I was loosing the sight with squares that size. :wall: Thanks to Techres for the enlightenment with that issue. At home, I started using 4 moa red dots that I made-up on the computer. Did an 8 1/2 x 11 with 8 of these, and started sending 3 rounds into each. Persistence paid off, so I thought it was time for an at-home QDAQT test.
Drum roll please ... Would you believe a score of 226? That matches my best official QDAQT using the scope. ^:)^ :---
Now, how about a little more adventure. During my practice, I decided to try taking off the prescription glasses, put on the shooting glasses, and have at it. (Remember, I can't see the big "E" on the eye exam.) I could not tell the difference by what the target told me! Step 4b was very different because the target lost it's "sharpness", but I could still have a GOOD ENOUGH sight picture that I was able to place the front sight on target. Also, don't think that I'm trying to keep the target in focus, but my eye is focused on the front sight, and I am focusing my mind on keeping the front sight on the target. So, the QDAQT demanded a round without the prescription glasses. Results: 210. Would have been better if I didn't slip out of the bubble on the third course and let the time monkey pressure me. Guess I can shoot without a scope afterall!
* So I proved to myself that aperture sights can be modified to work for my vision. :)
* I now know a bit more of what it's like for the new shooter on line and struggling with
their sights. Hopefully I'll have some insight to help them how to sort out sight issues. ~~:) , not
* I know that I don't have to depend on having a scope. O0
* Now I know that I should be ok with the sights on an M1 Garand. But this does not solve the problem of how to pay for that M1. :(
I'm open to suggestions on that one!
You might want to try a pinhole test to see if this might work for you. Simply put a small hole (pin or thumb tack) in something like a business card. Look through the hole at distant objects. Expect them to be dimmer, but if you find them sharper & identifiable, then this might be something that will work for you.
Anybody else have experience with this? I'm hoping that I'm not the only one to benefit from this little experiment. Give it a try and let us know how it worked for you.
Andre
Andre,
I'm confused by what you mean when you say you cut the piece of brass in half. Do you mean you hammered the .22 case flat, drilled it, and cut the bottom half of the flattened case?
Andre, You are quite the innovater and this topic is right up my alley. My eyes have 10 more years of experience than yours and the right one is due for cataract surgery soon (my dominant eye). I had to resort to a scope to shoot rifleman at my FOURTH APPLESEED. I was determined to qualify with iron sights (Tech sights in my case), but that double bonus bottom row just turned into 'blurries' and 'fuzzies' on me and my best scores were always in the 190's but never any improvement.
I also want to get a Garand and master its open sights. Will keep you posted.................steve
Thanks for that thoughtful and well-researched post! I still feel the need to qualify with iron sights - shot my Rifleman score (218) with a scope last December, and tried again in March with open sights, but it just wasn't working for me. Haven't shot much since taking the Orange Hat, but I have had a few chances at home, and what I've found is that my big problem with open sights is that I'm cross-dominant - right-handed shooter with left-eye dominance. What happens is that I screw my left eye shut so tight that it starts getting out of focus, and it seems to effect the focus in my right eye too.
I came up with a solution that appears to work for me. I bought some "eye occlusors", fancy talk for eye patchs. They're like big Bandaids that go over your eye. I used one on my left eye at our CT Instructor's KD day a month or two back, and I was finally able to sight in my AR's BUIS and start getting groups at 200 yds. I was surprised how clear my vision could stay when I could keep my left eye open and relaxed. Depth perception is gone, though, so taking the occlusor off between COFs is a must - just stuck it to the brim of my hat, ready for the next COF. I suppose there are fancier accessories, like flip-down shades, or I could just put tape on the lens of my glasses, but I kind of like the pirate look :cool2:
And just to keep on topic, I did notice a dramatic improvement in focus when I switched the aperature on the BUIS to the smaller hole. I might try the micro-hole idea on that sight, as well as the Techsights on our Ruger and Marlin LTRs.
Quote from: gunville on November 14, 2010, 12:41:49 AM
Andre,
I'm confused by what you mean when you say you cut the piece of brass in half. Do you mean you hammered the .22 case flat, drilled it, and cut the bottom half of the flattened case?
Gunville,
Sorry for the confusion - guess that's bound to happen thru the keyboard.
I measured the TS aperture in two ways. I measured the width - that would determine the width of the brass, and I measured the aperture diameter - that would be my guide for selecting the new aperture diameters.
I then used my Dremel tool to slice the spent .22lr brass length wise, but not all the way to primer rim. Then I used the width dimension that I mentioned before to mark the brass for the next cut. I measured and marked from the bullet end. This piece I then rolled out and flattened, marked and drilled the two different holes, then cut this in half to give me the two test pieces. Depending on how accurately you marked and trimmed, you may need to still trim this piece for a nice fit to the TS aperture.
Hopefully this helps - I'm thinking that maybe I ought to do the process again, taking pictures to show each step. ???
passinthru,
Yep - understand that 400 yd 'blurries' and 'fuzzies' thing. Before I did the sight mod, I often missed the paper on that course of fire! As I mentioned, the small aperture actually let me see that course "good enough" to shoot well without the prescription glasses. You might also enjoy my next challenge that I've given myself. I'm planning on learning to shoot weak side. Might actually do better once I get accustomed to it because my left eye, which is not my dominant eye, is actually the one with better vision (still can't see the big "E" though). Keep us posted on your adventure.
The Log,
Thanks for sharing your experience. We've had shooters use various types of eye patches as you've mentioned, but I might need to keep that fresh in my mind as I explore the weak hand/none dominant eye exercise.
Maybe you could design and market AS eye patches for those in need - one more way to 7th step ;D
Quote from: Andre on November 14, 2010, 10:17:27 PM
Maybe you could design and market AS eye patches for those in need - one more way to 7th step ;D
Genuine Appleseed pirate patches - "Arrg, thar be a good idea!" Now I just need to find someone from April 19, 1775 with only one eye so I can tie it to the history...
Quote from: Andre on November 14, 2010, 10:17:27 PMYou might also enjoy my next challenge that I've given myself. I'm planning on learning to shoot weak side. Might actually do better once I get accustomed to it because my left eye, which is not my dominant eye, is actually the one with better vision (still can't see the big "E" though). Keep us posted on your adventure.
One of our MA instructors was trying to put up a riflemans score wrong-handed at the last Leyden shoot. He would have done it too, if I hadn't yanked him off the line to share his new found experience with a left handed new shooter.
I'm thinking that it's a good idea, and I need to try it the next time I get the chance.
My fix was Williams peep setup with Meritt variable aperture.
Windage/Elevation not click adjustable & not cheap but works for me.
As an olddddd! photographer who experimented heavily with pin hole cameras back in the dark, non-digital ages I am well familiar with what smaller apertures can do for you. I had a shooter this weekend who was struggling with this same issue, astigmatism and the inability to see the last row of targets. I share this same problem! :o
I have a Williams sight on another rifle soooo..... that is no problem! But where in the dickens do you find a "Meritt" adjustable aperture for it! I can see this as solving a host of issues!! O0
Merit,
http://www.meritcorporation.com/products.html
MidwayUSA and other places online.
Congrats again 'biker on the RedHat.
The front post of the Williams Firesight makes a way cool front post aperture if you remove the colored optic fiber.
It circles the stage four silhouettes nicely.
Quote from: Scarecrow on November 15, 2010, 11:45:44 AM
My fix was Williams peep setup with Meritt variable aperture.
Windage/Elevation not click adjustable & not cheap but works for me.
This is what I was originally trying to do, but I got "lost" in their catalog and gave up. I've now gone back to find what you used. Also, I was not sure if Williams' replacement apertures would be small enough. I like the Merit addition. If only we could find that in something click adjustable. I'm trying to work with a M1 Carbine sight on my Ruger Mini 14 to give me the non optic, click adjustable sight setup. The cool factor is that it's actually starting to look like a M14. :cool2:
It's encouraging that you and others have wrestled though this and found a solution, too. Thanks.
I guess I need to make sure that I have my rifle on hand as a loaner for those of us who are struggling with the big apertures.
This may be worth a look...
http://www.tech-sights.com/inserts.htm
I got a set, and they do seem to help.
Quote from: 753x0 on November 16, 2010, 10:00:29 PM
This may be worth a look...
http://www.tech-sights.com/inserts.htm
I got a set, and they do seem to help.
Thank you for the link. I have been following this thread but have been unable to make a smaller aperture that would work. I have ordered a set of these inserts and hoefully they will work for me.
Theri
Thanks for sharing this information!
I had scopes on many of my MBR's because of my eyes and hate the damn things except for my more specialized rifles.
Last year I ordered a rear aperture of .038" for my 20" CMP A2 Service Rifle upper and the .052" NM front sight. Problem solved.
It came with a 042" and .046" and those two now seem huge.
I can now shoot POA at all yardages...again.
My other rifles are getting makeovers too.
As a side note all my MBR's have NM FS if they are available.
Quote from: 753x0 on November 16, 2010, 10:00:29 PM
This may be worth a look...
http://www.tech-sights.com/inserts.htm
I got a set, and they do seem to help.
Thanks for the link. When I ordered my Tech Sights, I did not see this option. I used a link directly to the Ruger page, looked at the accessories page, but never went to the home page. I assume it was there, but never thought to look there.
Their smallest aperture, .042", would probably work for me, since my .040" worked, but my .03125 aperture is by far my first choice of what I did. As TaosGlock pointed out, his .042 and .046 apertures are huge compared to his .038, so small changes can make a big difference.
Another consideration, I don't think we can simply find a "golden" aperture size. Eye relief will play a big part in how well this technique will work. The closer you are to the rear sight (can you say turkey neck?), the smaller the aperture can be. I find that with my small aperture, the field of view is more than sufficient and I'm able to see my front sight in great detail, which is exactly what I want.
Quote from: TaosGlock on November 17, 2010, 12:15:17 AM
I can now shoot POA at all yardages...again.
My other rifles are getting makeovers too.
As a side note all my MBR's have NM FS if they are available.
Thanks TaosGlock for your confirmation that this works for you. Hopefully this will be another point of encouragement to others on the forum.
I like my Merit adjustable aperature. The setting changes with the ambient lighting conditions.
Eye patches are better than dealing with cross eye dominance, but they will actually make your vision worse in the shooting eye. The iris in one eye reflexively opens when the other eye is not getting any light. This reduces depth of field and results in a more fuzzy target. This is why it is good to keep both eyes open. If you need to, put a bit of translucent tape on your shooting glasses so that your non shooting eye gets light, but not an image of the target.
I have "visited" this thread but not really "got into it" as I have a B. Jones lens in the NM aperature on my M1 and it works for me.
Yesterday I started camoflaging one of my AR15's. It has a scope on it with BUIS. Most of my AR15's have the GI issue Matech BUIS on them but this one "slipped" through with a MAD rear sight. It has 4 aperatures from tiny (no, I don't know the sizes) to large in four sizes. I put the rifle up to my shoulder, sighted on a tree limb, focussed on the front sight (blurry) and began to rotate the knob through the aperatures. As the aperatures went larger the front sight got blurrier (is that a word??) and as the aperatures went smaller the front sight got noticeably sharper (but never came into good clean focus for me).
I've seen those Williams rear sights before and may have to install one (with the adjustable insert) on my 10/22.
Good job bringing this up for folks to try.
Quote from: Old Dog on November 25, 2010, 02:22:43 PM
I have "visited" this thread but not really "got into it" as I have a B. Jones lens in the NM aperature on my M1 and it works for me.
Perhaps you could provide a link to this item? I'd love to see a lens that goes in a NM aperture. Not doubting, just unfamiliar, and it sounds like a good thing.
http://www.bjonessights.com/SR.html
I have never spoken to the guy but some folks report that when they call him he's glad to explain/answer questions and make recommendations. I put one in my M1 Garand and it works great.
I tried adapting one to a M1917 Enfield. I bought a "NM aperature" off the internet, ordered a B. Jones sight insert for it and bought a "spare" M1917 rear sight. As the parts came in I began working on my new M1917 rear sight with the intention of taking it to Ramseur for a field shoot. I drilled the rear sight (ladder) aperature and threaded the "NM aperature" into it. When the B. Jones lens came in it was too large in diameter for the "NM aperature". Evidently there are differents size hooded aperatures out there and the one I ordered was too small. I tried slowy (by hand) grinding the lens down in OD till it would fit the aperature. Got it the right size and stuck it in there. The hooded aperature was too shallow to get both 0-rings in it so I decided to use a tiny amount of sealer on the edges of the aperture. Don't do it. That stuff fogged up the lens as the vapors dried out of the sealant. Oh well. I tried. The M1917 goes back in the case except for really bright sunshiny days and the M1 keeps going to the range.
But the smaller aperature thing seems to work (even if my MAD BUIS did not go small enough). I may order one of the adjustable aperatures mentioned above and see if I can get it to screw into the spare M1917 rear sight.
@OD:
Thanks for the link. Interesting device.
Here is another idea for those of us with "39 and holding eyes'' ;). R.A.F. pilots during World War 2 are reported to have used Bilberry ( in tea I think) to increase their visual acuity. I have been using Bilberry Extract for a couple years now, ( availible at most places vitamins are sold). I can't offer scientific proof ;but it is supposed to work by increasing circulation to the eyes ( the rest of the body to). Thanks for the thread Andre, Bob :~
Cowboy,
Thanks for the tip on Bilberry, I'll do some research and may add that to the diet.
I've been doing some stretching of my back muscles, especially the lower back, and that seems to have given me some improvement with my eyesight. I had done an unintentional A-B-A scenario, and happened to note changes with my eyesight that seem to be related to the stretching. After I had been doing the stretching for a while, I was having problems with my glasses. Went to the eye doctor, figuring that my eyesight had gotten worse. He said it had improved, and that I needed to reduce the "strength" (my word) of my glasses. Recently, I slacked off the stretching, and my vision went haywire again. Got back to the stretching, and now things are looking better (pun intended). I like the idea of recovering what I can of my precious vision, so I thank you for your tip. Can't wait until I get to the point of seeing the .22 holes at 25m like some guys can. :)
I can see 22 cal holes at 25 just fine, what I can't see is the front sight.
I finally just broke down and put a scope on the LTR and now I can shoot 22 cases at 25 yards again
Quote from: SamD on December 16, 2010, 10:15:01 PM
I can see 22 cal holes at 25 just fine, what I can't see is the front sight.
I finally just broke down and put a scope on the LTR and now I can shoot 22 cases at 25 yards again
Hey, I resemble that remark. Pain in the butt ain't it. Glasses work fine till I breath and fog them up on the exhale.
Try putting an aperture on your glasses ( Merit, Anchutz, Gehman) Pain to use, but forces a consistant cheek weld and helps to focus on the front sight. A piece of electricians tape with an 1/8" hole does the same thing only cheaper. Vary the size of the hole until you get the optimal result.
Sucks getting old, don't it.
Milt
Quote from: SamD on December 16, 2010, 10:15:01 PM
... what I can't see is the front sight.
That is what actually started this thread.
Quote from: Old Dog
Glasses work fine till I breath and fog them up on the exhale.
And I was able to master that one, too!
Several ideas have been tossed around here to conquer "old eyes." ^:)^ :~
Thanks to all who have contributed.
Andre
Andre: Another idea for old eyes; I use vigorous exercise and a balanced diet to keep blood pressure and heart rate down and everything else up! ^:)^ Bob
ANDRE,
Have you tried shooting 'lefty' yet? I was forced to do it when visiting our son in MO. You can read here all about it (go to post # 7);
http://appleseedinfo.org/smf/index.php?topic=19485.0
But I shot with a scope, next I want to try open sights left-handed.
Thanks for keeping us all up dated on your experimentation.
.....................steve in San Diego
Quote from: passinthru on January 10, 2011, 09:27:44 PM
ANDRE,
Have you tried shooting 'lefty' yet? I was forced to do it when visiting our son in MO. You can read here all about it (go to post # 7);
http://appleseedinfo.org/smf/index.php?topic=19485.0
But I shot with a scope, next I want to try open sights left-handed.
Thanks for keeping us all up dated on your experimentation.
.....................steve in San Diego
Have not done lefty with the AQT's yet, but I did work on it for deer season. My setup required me to cover a wide area and a portion of that could only be done as a lefty. I set some paper plates up test my ability, and I actually shot better non-dominant (left hand, left eye) than I could on my dominant side. :o Gives me something to ponder, and a reason to pursue the non-dom setup.
Also, I had an occasion as an IIT to work extensively with a left handed shooter who was having trouble putting the SHF's into practice. I decided to try to model the SHF's as a lefty, thinking that she might be a visual learner. It worked. This is probably the most important reason for me to try to master the non-dom setup. I knew trying to model the SHF's this way was risky, since I had never done this before, but since the result was very positive, I need to get it down as a "natural" to give me more peace of mind.
The thread you referenced had caught my attention. Looks like you were able to transition fairly quickly. Your post gives us one more reason to pursue the non-dom setup. You never know when you might need that skill, and I think I'd like to have the confidence that comes with knowing you've been there, done that. Since you have the good vision in that eye, that might be an excellent incentive to work with that setup. Doesn't sound like focusing on the front sight will be a problem for you. I think mag changes might be an issue for me, but I'm sure that will fall into place with practice. (dryfire time...)
Bottom line: I've been guilty of not practicing the non-dominant position. Will get on it directly ~~:) :)
Guess I owe this thread an update dealing with my non-dominant (left) attempts (see previous post - #29 & #5 http://appleseedinfo.org/smf/index.php?topic=18329.msg148694#msg148694).
I gave this an attempt back in Janurary, just before most of us got hit with one of the "big ice" events of this winter. Didn't realize how quickly a person can get out of shape!!! I struggled to get into a good prone position. Disclaimer: I had just gone through a knee surgery, and had not been doing much of anything.
Second thing I discovered - I can't see the front sight with this small aperture now. So, me asks me, what happened? I'm suspecting that the back exercise I mentioned in reply #22 ( http://appleseedinfo.org/smf/index.php?topic=18329.msg154160#msg154160 ) might be the reason. Will need to test this one for sure!
Third discovery - It's totally foreign, like I've never shot a rifle before! I didn't expect this to be so difficult. When I tried this deer hunting with a lever action, I did better with my non-dom, and it wasn't difficult at all, but I was seated in a ladder stand for that situation. For this, I had to really concentrate on SHF and the 6 steps. BTW, before I shot non-dom, I shot 3 targets dominant as a benchmark. It was so bad due to eyesight AND being out of shape, that it was not a good benchmark from my way of thinking, therefore I've not bothered to make a comparison between the two.
Today's status: I'm back to getting into position without problem, I've been doing my back exercises, so I hope to do this test again soon. In the meantime, I put a scope back on (actually had to do 2 scopes - an unintentional lesson on scopes and their reliability!) and I'm back in the rifleman groove. Learning my history :wb: and a 233 project have kept me pretty busy, but I hope to get back to this test/exercise soon.
Andre
edited to correct grammar
My fix for my AR (M4 clone) was a little pricey, but worth it. I added an Aimpoint CompM4 red dot, same as the current and latest USGI CCO (Close Combat Optic). Now I can wear my glasses and shot well with zero magnification.
See my problem was real bad. Glasses on, one target, two front sights. Glasses off, one front sight, two targets.
With the CCO, one target, one dot, glasses on.
Quote from: Nickle on March 04, 2011, 05:41:02 PM
See my problem was real bad. Glasses on, one target, two front sights. Glasses off, one front sight, two targets.
With the CCO, one target, one dot, glasses on.
:o Whoa, that's some serious stuff. I'm glad that you found a solution, and I'd guess I'd pay the price too, if that's what it takes. Worked at Miamisburg this weekend, and Gordon let me take a turn with his rifle. I think the back exercises are working, as I was able to see the front sight very clearly. I'm going to get the Tech Sights back on the 10/22 in short order to be sure.
Good to see you back, Nickle.
Jim
This has been a great thread! I've been lucky to be able to shoot an aperture or open sight until I had a minor eye injury this past fall. Although the doctor said it was healed it left me with seeing a pyramid inside the rear aperture at about 2 o'clock. In light it's small but when it gets dim or overcast it is big enough to touch the top of the front sight.
I plan to go lefty but the aperture is egg shaped and the front sight is tilted to the orientation of the egg. I'm not going to give up on it, just going to do the best with what I've got. FWIW the open rear sight is okay.
A couple things. The adjustable iris is a good one as is the aperture with a smaller opening. One thing I saw years back was a guy had bored out the aperture on his issue M1 rear ap and threaded it to take a small threaded aperture of various sizes. The apertures were made from hex head cap screws, bored out to the bottom of the head where the hex bottomed out. He then made a set of them in different sizes about 8 in total IIRC. The cap screws were less than 1/4-20, but big enough to get a nice hooded aperture that you could easily change for various light conditions. An o-ring on the threaded portion near the hood kept them from loosening and in place. Probably would require someone with a milling machine to do it well.. You could also file a notch in the outer edge of the hood to index your ap in the rear sight, would alleviate zero problems with different aps.
Williams also made an ap with a brass ring around the outer edge of the hood supposedly to gather more light. Never tried one but it might be time to start.
I think the dangerous old men were so because the front sight was about 4' away from their eye. And the bilberry. Did you ever see older guys have problems shooting civil war era muzzleloaders? That is why. You can focus on a sight further out more easily. Those with short barreled whatevers take note. You may not see the front sight on your carbine but on your M1 it might be another story. At least for a little while.
Keep the ideas coming, we're all getting older.
I put an ear plug on the bridge of my nose between the bridge of my glasses and the bridge of my nose , it place's the focul point of the glass's in the right place upped my score alot ,,, Ok so I try to find the cheapest easyest fix I can works for me, try it it don't cost much.
Rifle used as issued M-1 Garand ( ok so it has cardboard shimes under the trigger group what the heck it will shoot 1.7 moa with good milsurp ammo as long as the nut behind the butt does his part).
Wade
Improvise, Adapt and Overcome!
There's the high tech way:
Quote from: TOMINCT on April 24, 2011, 02:04:05 PM
A couple things. The adjustable iris is a good one as is the aperture with a smaller opening. One thing I saw years back was a guy had bored out the aperture on his issue M1 rear ap and threaded it to take a small threaded aperture of various sizes. The apertures were made from hex head cap screws, bored out to the bottom of the head where the hex bottomed out. He then made a set of them in different sizes about 8 in total IIRC. The cap screws were less than 1/4-20, but big enough to get a nice hooded aperture that you could easily change for various light conditions. An o-ring on the threaded portion near the hood kept them from loosening and in place. Probably would require someone with a milling machine to do it well.. You could also file a notch in the outer edge of the hood to index your ap in the rear sight, would alleviate zero problems with different aps.
And then there's the low tech way:
Quote from: Wade on April 24, 2011, 08:36:10 PM
I put an ear plug on the bridge of my nose between the bridge of my glasses and the bridge of my nose , it place's the focul point of the glass's in the right place upped my score alot ,,, Ok so I try to find the cheapest easyest fix I can works for me, try it it don't cost much.
Rifle used as issued M-1 Garand ( ok so it has cardboard shimes under the trigger group what the heck it will shoot 1.7 moa with good milsurp ammo as long as the nut behind the butt does his part).
Wade
either way, I say O0 O0 O0
ps - Wade, I assume that you are a master of IAO, based on that mobile, elevated firing line you have.
I got a pair of Bob Jones shooting specific glasses for my astigmatism this year for Service Rifle competition,,,they work much better than a standard glass prescription for me. I can see the front sight very clearly and the target a bitt fuzzy on my tech sights, NM CLE upper and my M1A NM. For an astigantism, I think it was the best solution for me. It would at least be worth calling him on the phone to discuss it, as he has a lot of experiance dealing with precision shooters. For an astigmatism the glasses work far better than the diopter insert.