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Posted: 2/14/2017 9:44:56 PM EDT
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I'm getting a fuzzy front sight post when trying to sight in my S&W M&P 15 carbine. I have a carry handle for a rear sight.
Any suggestions for curing the fuzzy/blurry sight? It's so blurry I'm having a hard time trying to obtain a 25m zero. My distance vision is fine and I wear 1.75 reading glasses. The reading glasses sharpen the sight but totally blur the target. Any suggestions? Thanks. |
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Sharp sight blurred target is what you want.
I had my eye doctor get my dominant eye prescription set so it focuses on my front sight. This is what I wear in glasses and contacts. I also have an extra set of contacts that have normal vision for the dominant eye. Just measure the distance from your eye to the front sight. Ask the optometrist to set your focus point at that distance and you will be good to go. ETA: the only other option is to go with a scope etc. |
| See what your dominant eye is. Make a diamond with both your index fingers and thumbs. Now look at a distant object and put the diamond "in the middle". Close one eye. If you see the object, that is your dominant eye. If you see your hand, the other eye is dominant. You be like some people and be right handed but left eye dominant. |
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Were you looking through the 0-2 aperture?
Knife_Sniper's guide to iron sights. |
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I felt a disturbance. It pleaseth me. 
Anywho... The small peep will sharpen the image only so much. To sharpen the target further, you need to do one of two things. Increase the sight radius: this will broaden the depth of field meaning your front sight will be clear and the clarity of the target will improve as well. The clarity will increase the further you move the front sight away from you. Put your finger right in front of your face. Focus on it but observe the background. Fuzzy. Put your finger at arms length and focus on it. Observe the background. Slightly clearer. Get a smaller peep: shrinking the diameter of the peep sight will also broaden your depth of field at the cost of light. As the sky darkens the small peep will make the target appear very dim. Remember that the large peep is actually a ghost ring. If you focus on the front sight with the ghost ring your target will be increadibly fuzzy. With the large peep you want a crystal clear target and a fuzzy front sight. The close range nature of the large aperture means that a fuzzy front sight wont matter much. Its for speed and low light, not precision. |
| Safety glasses with 1.75 diopter inserts in them aren't too expensive. Look for them on Amazon. You can get safety/shooting glasses with the magnification inserts at the top or at the bottom of the lenses. Those might help--takes some experimenting to figure out the proper, consistent setup. |
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Not meaning to throw insults here...
Our eyes work less efficiently as we age. I'll be 39 years old this year, and I can definitely see my iron sight abilities beginning to fade. It's gotten more and more difficult to keep everything in focus more recently. Your rear sight should be fuzzy, your front sight clear, and your target will probably be slightly fuzzy. If you're having trouble getting that picture into place, I don't think that any glasses or contacts is going to really fix it. However, good prescription glasses may prove to be far superior to basic 1.75 magnifying glasses in terms of getting everything into focus. Right now, I'm trying my best to not get glasses or contacts. The Air Force wants me to wear them, but my civilian employer doesn't care (I'm a fixed equipment / welding inspector - good vision is important). It may be that you just need to practice more. Also, I've noticed that my eyes work better at certain times of the day, and under certain conditions. Seems like they've gotten better since I quit drinking coffee for some reason. If I quit drinking beer, it would probably improve things more... maybe next year. |
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I'm 60 now and have difficulty seeing the front sight and it changes from day to day. I went to the local Dollar Store and purchased readers in 1.25, 1.5 and 1.75 strengths and on any given day one of them will work great. The ability to focus back and forth between the target and the front sight post disappeared almost 20 years ago. It's one or the other, with that being so it's always best to have a clear front post.
One of the reasons the CMP/NRA recently changes the rules to allow scopes up to 4.5X to be used in competition was the fact that many "old timers" still like to shoot, but simple can't compete with irons any more. It's a fact that all the services are issuing RDS or ACOG's on their duty rifles, but the soldiers are rarely over 40 years old when they retire. The Armed Forces competition teams can still use irons without problems, people like me not so much. Carbine gassed rifles are the worst, M1 Garands the easiest to see. |
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