Rear aperture

[From Along The Trail]

The picture I posted is of a Dezeng hand held ophthalmologist test instrument. From 1904. I just searched the net for it, and there is one on eBay.
It has two disc’s in it that have different lenses, that acts like today’s test equipment in the ophthalmologist office. In the next week or two I will make a mounting device to hold it in a eye glass frame. And then test to see how it works for seeing targets. With a trial set of ophthalmologist lenses, I have noticed that looking at more than a few hundred yards, my prescription glasses are not as good as what the trial set of lenses can do. If money was unlimited, I could get special glasses made for shooting.
I bought my trial set of ophthalmologist test lenses because I was having vision problems. And was getting shots in each eye every 6 weeks. That really disrupted trying to shoot. Cannot hit what you cannot see. Yes at one point, I could not see a target at 100 yards, or it was so difficult one day I just squeezed the trigger at a blank picture.



I am trying to use parts and equipment that’s was available back in the day.

[ian45662]

I have prescription shooting glasses and they were no more or not much more than regular glasses. My optometrist was kind enough to let me bring a rifle into her shop. She marked the test glasses where my eye was looking through the glasses when I was looking through the sights. She put the optical center of the prescription shooting glasses there. She also upped the diopter 1 so that I Would have perfect clear view of objects that are about 30” or so from my face. The lenses also have a violet tint so which makes black stand out a little better. When wearing these glasses and just looking at targets they look really blurry since they are set up for closer vision but when looking through the sights with the rear aperture set up the way I normally do everything looks really good. Crisp front aperture and a target that is somewhat crisp. Not very blurry.

[From Along The Trail]

My eyesight over the last 3 years have been real problem. I was just reading some of my medical records, and posting I did on another forum.
I did not know at the time I was posting on another forum about building a muzzleloader, that it would turn into a medical record of my vision deterioration. On August 17th 2020, I could not see a target @175’ through a tubular scope.

The other thing I noticed at that time, if I was looking at a news show on tv, I could not see from the bottom of the upper lip to the bottom of there nose on the news caster. That space was blank. That will make you think.

So after several months of eye injections, my eyes stabilized enough to get new prescription glasses. So have my own set of ophthalmologist trial lenses look interesting. So I bought a old set of eBay.

[ian45662]

My eyesight over the last 3 years have been real problem. I was just reading some of my medical records, and posting I did on another forum.
I did not know at the time I was posting on another forum about building a muzzleloader, that it would turn into a medical record of my vision deterioration. On August 17th 2020, I could not see a target @175’ through a tubular scope.

The other thing I noticed at that time, if I was looking at a news show on tv, I could not see from the bottom of the upper lip to the bottom of there nose on the news caster. That space was blank. That will make you think.

So after several months of eye injections, my eyes stabilized enough to get new prescription glasses. So have my own set of ophthalmologist trial lenses look interesting. So I bought a old set of eBay.

That makes it tough… Really tough. Have you ever had a chance to look through a BPCR style of scope?

[From Along The Trail]

I have been thinking, I have never even had a Sharps rifle in my hands.

I was offered to look at one last winter at River Bend gun club in Dawsonville Ga. I feel bad that I did not take a close look at it. I believe it it was Coltsmoke that offered to look at his rifle.

I may have to drive past Big Timber Montana this week. That trip has not been determined yet. But if I do venture out that way I will stop at the factory. I have stayed in Big Timber several times before, but that was before I found this forum.

In the last year my eyesight has returned to what I would say is really good for being 69.
I will also say that I have a much better idea about how to use iron sights. Thanks to ShuetzenDave and other people discussing how to use iron sights. I have to do much more time looking through my sight tube that I made, to understand how to use it to its full potential.

[ian45662]

If you ever get a chance take a look through a scope. That might be something that could keep you competitive if you decide that your eyes are just too far gone for Irons. Might be for you or maybe not.

[ian45662]

I consider myself very fortunate to still have pretty good vision. I am in my early 40s though so I expect it to start going south anytime soon.. At my last eye appointment my Dr told me that my vision had actually improved though and was almost 20/20. Again I considered myself very fortunate.

[Kurt]

When I shot iron sights I used the Knobloch shooting glasses. They are adjustable so you look through the center of the lens and not through the upper corner of the lens.
They also allow you to clip on different lenses for light conditions.
A friend I shoot with here at home shoots Perry and I have seen him clamp on an Iris shutter and he said clamp this on your glass and try this once. It really made a difference looking through the M1A sights. But they have a larger aperture opening than what the Hadley has so I cant say if this would work with the smaller holes.
https://sportshootingdepot.com/product/k1-frame/

[From Along The Trail]

Since the beginning of posting on this subject, I have learned quite a lot about looking through iron sights.
I know I am sorta on the edge of conforming to a normal rifle of such.

One thing that was frustrating when shooting, was seeing through my scope tube. When I first built the scope tube,( not sure what to call it, but it is similar to the idea of a Malcom scope.) I built it from things that I found that I could make work. I did not know of this forum at that time.

The main thing I that made a difference was seeing in different light and cloud conditions.
Before when I went to a range, I had to figure out seeing the target at different distances and conditions, while leaning how my rifle would shoot with different bullets. Paper patched, grease groove and different lead hardness. All can get real confusing at times.

I do have a extra scope tube for testing my vision and rear and front site parts. The front site is a loop of .022 copper wire, made into a loop. Not sure of the inside diameter of the loop that I look through in the front. The wire is about the thickness of copper wire used on the telegraph during the buffalo days.
The rear is a nipple from a muzzleloader.

Now the nipple from a muzzleloader is about .028 I’d. That is really hard to see through. So I drilled out to different sizes.

.032
.041
.047
.056

Well those size openings are somewhat hard to see through. But I did it. Some had that fuzz in it. Remember I did this before I heard of the normal sights for sharps style rifles.

So I had one nipple left for test. So I drilled a .080 hole in one. Installed it in my test scope tube. Went outside with it in my test scope.
What I difference it made. I now can see the front sight loop and center the target in the middle.
I was trying to get the rear hole to be small enough to be
Accurate? That was confusing and frustrating.

So I remembered ShuetzenDave mentioning different light conditions. Sun and clouds, along with brightness. And being able to see properly through the rear opening of the scope tube.

I have been practicing looking through the scope tube at home. In first light of the morning, cloudy days, sunny days. That take some thoughts as to when the sun is on the target in the morning. At a right angle to the target or above the target.
Also moisture in the air. The other day it was sunny outside, but 14 degrees. I could not see the center of the target at 1000 yards.
Now what could that be. It is sunny and bright out. I finally thought there could be ice crystals in the air. Enough to block the target center.

Thanks Dave for the help,

Vern

[desert deuce]

Shooting silhouette in the shade with front and rear sight shaded I look at the Turkey swinger and adjust the rear aperture for best sight picture.
Clouds or otherwise changing light can cause the rear aperture to be adjusted. With irons I do go with larger front aperture for chickens.

Shooting Target in the open this time of year the light is on the back of the front sight here and usually the back of the rear sight also. This changes where you set the rear aperture as the sun moves from right to left behind you. For those wearing corrective glasses keeping the direct sunlight from illuminating the area between the aiming eye and the back of the glasses lens is important, especially in the morning. I look for a sight picture that is comfortable and repeatable. This is where head position comes into play because with the light shining on the back of the front sight, depending on your sight, the spirit level may be difficult to impossible to see.

[steveu834]

Glad to see that your experiment is working.

[1minute]

A couple years back I was experiencing the cobweb phenomena with all of my peep systems. Turns out it was cataract related. Corrective surgery erased it.