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Posted: 11/1/2011 8:30:58 AM EDT
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Here's what happens; with my Leupold Prismatic I get a "double" or "ghost" image at least 75% of the time when I look through it. I've tried everything; adjust and re-adjust focus; move sight forward on rail; move sight backward; concentrate on target; concentrate on reticle. Nothing seems to help. I can close my left eye and all is fine but I want to use both eyes open. It happens with the reticle lit and with the reticle off.
I have an Aimpoint; an Eotech and an Accupoint. Doesn't happen with any of them. Even when I put the Accupoint on 1.50 (I did this because the Prismatic seems to have a slight magnification). I would like to be able to use the Prismatic indoors because of astigmatism issues. If you own a Prismatic and can offer any info or insight, please do so. Thanks in advance. |
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Quoted:
I can close my left eye and all is fine but I want to use both eyes open. It happens with the reticle lit and with the reticle off. I have an Aimpoint; an Eotech and an Accupoint. Doesn't happen with any of them. The Prismatic is a fundamentally different type of sight than "red dot" type sights like an Aimpoint or Eotech. It is an optical sight, just like a magnified scope, just that it's "1x" power. It has lenses... optical elements inside the scope. It has eye relief, eyepiece focus, and "image parallax" for lack of a better term, just like any other optical sight. IME the amount of "image parallax" is what is preventing you from using it both-eyes-open, as it exhibits a significant amount of it. Many of the 1x-something variable scopes are better at 1x than the Prismatic. My best suggestion is to select a more appropriate sight, which has none of those issues. If you want to continue to use the prismatic, you'll need to find a good eye relief distance and focus combination to give you the best view though the scope, and practice to maintain a consistent cheekweld. But there's no way to fix the "image parallax" issue, although focus does help a little. As I mentioned before there are several choices in variable power scopes that do better at both-eyes-open at 1x power than does the Prismatic, if you can't use an aimpoint or other red dot for whatever reason one of them might be a better choice. |
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Thanks, guys.
I have had someone else look through the Prismatic; they experienced the same thing. To Gamma; It may well be that my particular vision parameters don't work well with the parallax inherent in the Prismatic. I'll keep working on cheek weld, etc. and try to reach a happy medium  .
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Eye relief is listed at 3-5". Ensure your's is adjusted accordingly (both eye relief and focusing lens).
Essentially this is a 1x scope. The same technology as any 1-4 variable, minus the variable part. Just think of it as a lightweight 1X optic that provides better optics than conventional RDS's. But with the inherent limitations of a scope. If double image continues, return to Leupold for fix/replacement. I'm guessing there's something wrong internally if multiple people experience the same thing. but I'd make sure it's adjusted correctly first before returning it. And don't be discouraged from getting it serviced, it's not like Eotechs or Aimpoints are immune to issues –– all optics have some issues occasionally, and when they do, return them and insist they get fixed. Reputable manufacturers will take care of you. |
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I had a problem with that also, when I tried a prismatic. I figured that my eyes were fighting for dominance. Your right eye is focusing on the recital, your left eye is focusing on the target.
That is my guess at least. The prismatic is not like a red dot or a holosight. It is a 1x scope. Posted Via AR15.Com Mobile |
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I appreciate the input. I agree that each of my eyes is doing it's own thing and not working in conjunction with each other. Still strange to me that my Accupoint doesn't have the same problem as it is a 1x scope at the lowest power.
Oh, well. Guess the Prismatic is not going to work for me. |
| The issue is that the image you are seeing through the optic, is not aligned with the real world that you are seeing with your other eye. If you move your eye relative to the scope, the image through the optic changes in a different way than what you see through the other eye. Different 1x optics have different amounts of this effect. |
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It's not a hologram.
Personally, I think it's more of an issue with eye-dominance, parallax and/or eye relief. Shooting with both eyes open takes some getting used to. When running drills, I find myself reverting to the off eye squint. BTW, I am a camera operator and when running handheld I switch back and forth from one eye to two. The brain gets a little confused when one eye is focused at infinity while the other is focused on an object 4" away. Even more so when that object is magnified. I do this to reduce fatigue as well as to see where your going while moving and/or pick up subjects in your periphery. The ocular image often goes blurry and sort of dissolves in over the naked eye image. That's ok because I'm usually just concerned with the framing. But if I need critical focus or attention to detail in the ocular, then I close my left eye. It's a brain thing. Like closing your eyes when you tie apron strings. |
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I think you need to get something else. I don't think it's the optic; your eyes just don't like the Prismatic.
Slightly off topic, I'm surprised that many people have problems with the Prismatic. I just went shooting yesterday using Aimpoints and a Prismatic. I did just as well using the Prismatic as I did with the Aimpoints. Maybe I just don't know any better - "ignorance is bliss" they say. |
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Quoted:
For the folks that are saying that I need to return the sight for repair/replacement; If I can close my left eye and the doubling effect goes away, does this still mean that it's the sight (or is it my particular sight problem)  ?
Thanks. That means it's you, not the sight. I agree with the other posters, this is likely an eye dominance problem, especially since you mentioned that it doesn't do this every time (your original post said "at least 75% of the time"). Even though this is labeled as a 1x scope, it's not exactly 1x for a variety of reasons that quickly devolve into a discussion of physics. Additionally, the picture you see in the scope is what the scope sees from the *other end*, so when you're using it with both eyes open one eye is effectively a couple of inches in front of the other. If you are strongly right eye dominant then this isn't a problem, but if you're only slightly right eye dominant then the brain gets confused. The fact that this happens only some of the time makes me think that it has something to do with how tired your eyes are at the time, how much caffeine you've recently had, etc. |
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