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Posted: 10/11/2014 11:11:17 PM EDT
I have been reading about it, and ..... 
The bottom line: Will I have an issue with mounting my Leupold VX I 2-7x33 to a rimfire and shooting 90% of my shots way under a 100 yards? Zero at 50. This is not a rimfire scope. This will be on an AR upper. I doubt that makes any difference, but cheek weld and scope height are obviously different than other rifles. Thanks for your help. |
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See here:
http://www.6mmbr.com/parallax.html You're likely to have some potential for error depending on eye position with that scope at 50 yds (or distances other than 100 yds) but I'd venture that the error would be small. In the end, telescopic sights without parallax adjustment *all* suffer from this to a degree for ranges other than that for which they're designed to be parallax-free. The only way to know for sure would be to place the scope/gun on some stable rest, sight at some target at 50 yds (or some other range) and move your head around behind the ocular and see how much movement you get. I happen to own one of those very scopes. I'm curious myself, and may try this tomorrow. |
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Well, I did try it with my VX-1 2-7x.
It happens that I live at the end of a cul-de-sac in a wooded area. There's a little pine at the edge of my yard at maybe 10 yds from where I set up, the trees at the edge of the island in the cul-de-sac at about 50 yds, and the trees on the other side at about 100. I was a little surprised... it's very obvious that there's significant parallax error at 10 yds. With my rifle balanced on a stool, over a jacket and wad of newspaper (I have a real talent for improvisation) and the scope set at 7x, as I moved my head from side-to-side, the little pine at 10 yds seemed to traverse the vertical crosshair by probably a few inches. As expected, at 50 yds, it seemed to be about half that, and the image appeared stable at 100 yds. I was able to see the bits of trees at all three distances, simultaneously, because of the way the trees line up. Note that I was moving my head such that the black edge of the sight picture was literally passing the crosshair, in both directions. In actual use, you wouldn't get that much variation even with an inconsistent hold. Now that I've done it, it makes perfect sense, and I'm sure I'd get an identical result from any of my scopes, all of which are adjusted to be parallax-free at 100 yds. Given that the error at 50 yds was perhaps ~1.5", I'd say you're looking at some fraction of that in actual use, assuming a reasonably consistent weld/hold. Probably not terribly critical at 50 yds. But at 30 ft, the potential for error is obvious, and now that I've seen it, I do think if I were scoping a .22, I'd probably shop for a (50 yd) rimfire scope. The error was greater than I expected. The OP and anyone else can easily verify/refute my results themselves, given a typical 100 yd scope and a suitable collection of trees. |
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Thanks for your article cleger, it was much easier reading than I had found.
I just tried it in my back yard and I see exactly what you are talking about. I really had to adjust my eyebox to get 15 yards to focus, trying to keep the reticle sharp. It took me a while to get everything right. I am going out this afternoon to try it out on the rifle and see what happens when actually using it. I do understand what the others mean by consistency, always important, but very important with this set up. I just bought this 22 upper, so I will have to use this scope until funds allow for something else if needed. I wonder if Leupold can adjust the parallax down to 50 yards on this scope and what it would cost? Thanks for your time. |
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Was just visiting Leupold's site and I'm reminded these scopes are set for 150 yds, and not 100 as I wrote above.
Looks like they'll change parallax on that scope... it's a $25 option on their range, though that's when buying a "custom" scope from them. I'd contact them and see what they say. |
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Just an FYI:
Using a Leupold VXI on a rimfire on the bench and off the bench worked for me today from 15 yards to 50 yards regarding parallax. I will have to practice more to make sure I am consistent. The goal is to mirror my truck/multi-purpose gun so I can shoot more since 22 LR seems to be coming back... at least for now. I shot about 300 rounds today and didn't seem to have a problem with parallax. I may not know what I am talking about, but this may be a good way to teach a newer shooter about consistency with cheek weld as a few of you mentioned. This scope has the LR Duplex, and I zeroed at 50 yards. The 1st hash mark raised the point of impact 2", the 2nd hash mark raised the point of impact 3", and the post raised the point of impact 6". I will have to see what yardage that calculates to later. I did email Leupold to see if they will set the parallax at 50 yards and what it would cost. EDIT: failed to mention that my wife struggled with this set up, especially under 50 yards Here is the set up for now:  </a>" />
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