Focusing with a diopter sight.....


September 8, 2010, 08:46 PM
i was wondering if anyone had any tips on focusing with a diopter sight....i am having trouble at 10m.......i will see the target clearly for about a second and then it will blur into oblivion.......i also wear glasses if its relevant.

thank you for any help.

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Rail Driver
September 8, 2010, 11:16 PM
Are you using a diopter on the glasses and an aperture sight? If so when I'm shooting with a diopter, I find it helps to back off from the sights some at closer ranges.

September 12, 2010, 11:47 AM
Hi Cameron!

I assume that you are shooting 10 meter air rifle? If you are, and you are experiencing blurring during the sighting process, you are in dire need of a set of shooting frames. What is your correction in the sighting eye? This will determine what diameter lens that you will be able to use. I would also highly recommend that if you do indeed get a pair of shooting frames that you have the lens edge coated black. This is a must to prevent light from entering the side of the lens and causing distortion. I have a vast amount of experience with shooting frames so I can help you get off on the right foot. You need to see the target crystal clear and settle for nothing less!

I trust that I have helped you.

Howard Roark
September 12, 2010, 12:57 PM
Your problem is that your eye is not relaxed at the correct focal distance and your glasses are not the correct power to achieve this.

You want to be refracted at twice your sight radius. This will allow your eye to be as relaxed as possible so that it will hold the focus on the target. What is happening is that your eye is in a strain trying to hold the lens to obtain focus. As the match progresses the eye muscles get weaker and weaker and the focus dwell time gets shorter and shorter.

Knobloch is one brand of shooting glasses that you can get different power lenses. There is a lot of good info here about focal plane. (

Another option is to use a lens in the front sight. That will magnify the target making it easier to focus on. There are basically two diopters for this .025 and .050. These alone will not help if you have an astigmatism. That will have to be corrected with contacts or glasses. The advantage here is that you get a bigger target to shoot at. Even young olympic shooters with perfect vision use lenses so that their eye will focus at rest at the desired focal distance and that is the goal.

September 12, 2010, 07:19 PM
hey guys....i actually figured out what my problem was........

pretty simple fix........i just need to keep both eyes open......and now its clear as day....and now that i can see clearer.....i am shooting much better :D

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