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Posted: 4/19/2007 6:36:07 PM EDT
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Hello, I just got my TA31F, right now it lives on a disembodied upper,  , so I've only really been fiddling around with it, though I have had a chance to check it out on a complete rifle, just for eye relief, ect. not shooting with it, but from what I can tell, the BAC seems to be real easy for me pick up. I know there's been some discussion with regards to some people having more or less of a problem with being able to use the BAC feature quickly enough for it to be worthwhile, but I wondered if the BAC has any parallax? Perhaps I've been spoiled by my Aimpoint, but one of the best things about it, in my opinion, is the lack of parallax. I wondered if the same applied to the ACOG when using the BAC. I had assumed that it would have some parallax when used as a magnified scope, though honestly, with the eye relief of the TA31F, it seems difficult enough just to get the point of aim to shift without losing the picture entirely, but I'm not sure how the BAC would work in that scenario. Maybe I'm just creating more problems for myself, and the parallax shouldn't even matter at the ranges where I'd be using the BAC? Thoughts? ~Augee |
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I have an ACOG TA31 Donut and just from my experience, I'm always a few inches off at 15y when using BAC. You can notice the POI and POA are not the same by shifting your focus from the target to the scope. They're different, aren't they? I just compensate for it by shooting a lil' bit left. |
What you're describing is phoria, not parallax. The problem is that our eyes are not perfectly parallel to each other. So, when you're moving the ACOG quickly, your "shooting eye" sees the red donut of death, chevron, triangle, whatever but the other eye sees the background. Your brain superimposes what your dominant eye sees on the background presented by your other eye. Since those two eyes don't align perfectly, the reticle *seems* to be off for your point-of-aim. This is normal. ACOG scopes are parallax-free along their vertical axis. Of course, if a person's spot weld isn't reproducible, that isn't going to help very much along the horizontal. Hope this helps. |
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