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Help with Parallax Adjustment

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/31/2011 at 05:47
penguin6 View Drop Down
Optics Apprentice
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Joined: October/03/2010
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My understanding of how to use the side parallax adjustment is as follows:
 
Rotate the knob to infinity and dial it back down to bring the target into sharp focus, then fine tune by moving my head slightly up and down and/or side to side and adjusting the knob until there is no movement of the reticle on the target when I move my head.  Somebody set me straight if I've misunderstood something.
 
With the scope I'm working with now, an Accupoint 5-20, I can eliminate movement of the reticle in relation to the target either up and down or side to side, not both.  In other words, if I adjust the side parallax to where there's no movement of the reticle on the target when I move my head slightly up and down, there will be movement of the reticle on the target when I move my head side to side, and vice versa.
 
Questions:
1)  What's up with that?
2)  If I simply bring the target into focus and don't bother with fine-tuning, at what point is that going to cause a problem?  The range I use only goes to 200 yds, and while I don't notice any change in my groups at that distance no matter how I do it, I want to develop proper habits in case I get the opportunity to shoot at longer distances.
3)  What's the relationship between having the reticle properly in focus with the ocular adjustment and the target being in focus when the side parallax is set correctly?  In other words, if my ocular focus is not set correctly and I've adjusted the side parallax to where there is minimal movement of the reticle on the target when I move my head, is it possible that the target will not be in focus?  If that's possible, then using a sharply-focused target as an indication that the side parallax is properly adjusted wouldn't work. 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/31/2011 at 09:35
8shots View Drop Down
Optics Jedi Knight
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'lord of the flies'

Joined: March/14/2007
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You are doing everything correctly.
1)The apparent movement you see when moving side to side, but not up and down, can possibly be because the vertical reticule (wire) is either in front of or behind the horizontal reticule. (As opposed to say a reticule etched on glass. )
 
2) By course focussing you have allready eliminated a large % of parallax error. The remaining error is so small that it should have no effect on your grouping. Other factors such as locktime, trigger pull, wind etc will be a larger problem. At a guess no more then 1/8th MOA
 
3)The ocular is used to bring the reticule in focus for your eyes. The side parallax is then used to bring the target onto that same plane of focus. If your reticule is not in focus through the ocular adjustment, you will not have a clear picture of your target either when bringing it to the same plane of focus.. So yes, the target will not be in focus when parallax is dialed out.
 
You have everything spot on.
 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/31/2011 at 09:41
billyburl2 View Drop Down
Optics Master Extraordinaire
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Kind of weird though... I think the Accu-point has an etched reticle in it.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/01/2011 at 10:05
penguin6 View Drop Down
Optics Apprentice
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Thanks for the help.  I'll make sure the ocular is adjusted properly, then work with using the parallax adjustment to bring the target into focus rather than look like a bobble-head doll each time I change distance.
 
bb2, I've not heard/read that the Accupoints have etched reticles, but I'll see what the guys at Trijicon say.
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