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Parallax article in airgunner

Discussion in 'Anything Airgun Related' started by Joe.destinct, May 27, 2015.

  1. Joe.destinct

    Joe.destinct Member

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    I was reading airgunner magazine earlier and there was an article that implied (if I read this properly) adjusting the parallax would affect the zero? I zero my rifle at 30 yards with parallax set to 30 yards, however I adjust the parallax in the field depending on the distance of the target to sharpen the picture, is this incorrect?
     
  2. Stevie Darling

    Stevie Darling Sexual tyrannosaurus

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    If you adjust the ao, or side focus to get the sharpest image then everything will be on the same focal plain.

    put the scope reticule and your eye on target, say a 5p bit, then move your head up and down,

    if the reticule moves off target, that is parallax error:)
     
  3. Joe.destinct

    Joe.destinct Member

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    Thanks for confirming that Steviee! Just out of interest; adjusting the focus on the ocular lens after zeroing shouldn't affect the zero either should it?!
     
  4. Stevie Darling

    Stevie Darling Sexual tyrannosaurus

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    Once you get a nice sharp reticule through the ocular , then you shouldn't need to adjust it again:)
     
  5. oliver13

    oliver13 Donator

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    I don't underdstand parallax, I just take other peoples word it exists & behave accordingly - so far, so good.

    For what it's worth I've never noticed any effect on POI when I've adjusted parallax, but if a Brain says it does than I suppose it must, but it can't be too much if I haven't noticed anything in the last couple of decades of shooting.
     
  6. twodoctors

    twodoctors Engaging Member

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    That's probably because you have good technique, and consistent cheek-stock weld, therefore able to look through the scope from the same position consistently. This will mitigate any parallex error and hence consistent POI.

    Easiest way to explain parallex error is...

    Imagine looking out a glass window at a postcard in the distance outside. Draw a reticle on the window over this point. Now provided you look through the windows from exactly the same position each and every time, the reticule should sit on top of the postcard. Now move slightly to left or right (up or down), the reticle is no longer on top of the postcard.

    Same thing with scopes. The reticle is the window, and the target is the postcard outside. If you look through the scope from a different position each time, to target will move away from the reticle, as above. This is parallex error. This can be corrected by bringing the "target" onto the same plane as the reticle (ie bringing the postcard right up against the window) so that they "merge". This will means that whichever angle you look through the scope, the reticle will always sit on top of your target (ie like drawing a reticle on the postcard itself).

    Hope that helps.

    Adrian
     
  7. Dr B

    Dr B Grizzly Airgunner

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    On the whole, I dont alter my A/O in the field. I set it for 28yds, based on the crisp image not necessarily the markings on the scope as these are not always 100% accurate, and leave it. I should add some caveats. I dont shoot beyond 40yds (my limitation, not the guns), and I may ever so slightly tweak in the odd circumstance - but on the whole I've not had major issues. For those of you shooting .177s out to 65yds it may well be a different story.....I dunno.....:up:
     
  8. oliver13

    oliver13 Donator

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    Kind of you to say so, but if I do have a good technique it's because I learned to shoot with rimfire 4x20 scopes on Airsporter's & Webley's, presumably parallaxed to 100 yards...

    Getting back to the OP, I've just been out trying out various AO scopes, winding them in & out, & it's not affecting the POI, at least out to 35M that I can see.

    As a footnote, I don't read the mags much nowadays but I have seen at least one howler by a respected airgun author regarding trajectory, so if they can be wrong once they can be wrong again, we're all, godammit, human.
     
  9. twodoctors

    twodoctors Engaging Member

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    Or you are a realist and knows that it's human to shoot in groups rather than pellet on pellet every single time! ;-D

    Adrian
     
  10. Darren Petts

    Darren Petts Temporarily Alive

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    Adjusting AO or SF shouldn't affect point of aim but often does due to sloppy tolerances. I've had a number of scopes that shifted this way. Adjusting the main parallax setting such as on a non-adjustable scope by loosening the end and turning will always ruin zero and often by a large amount.
     
  11. Ballisticboy

    Ballisticboy Busy Member

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    I am afraid I often see mistakes in magazine articles written by all kinds of "respected" authors. But then again it is the same in any newspapers or magazines if you read about something you happen to know about.
     
  12. Gollum

    Gollum Donator

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    I read it and was a bit dissapointed. Too much science and not enough telling newbies what an occular ring is and where to find it. I worked out its the bit by the eyepiece with a screw to fix it (I think) :confused:
     
  13. stryder5

    stryder5 Donator

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    I think some claims are greatly exaggerated, recently an article on scope mounts. Reviewer stated that a certain make costing around £30 were the best you could buy no question, try telling that to First Tier.

    Laugh, I nearly p****d myself.
     

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