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Poi and parallax

Discussion in 'Night Vision Optics and Illumination' started by Meteor62, Jun 7, 2015.

  1. Meteor62

    Meteor62 Major Poster

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    Recently I have noticed after sighting in my rifle when out in the field my poi has changed. This really came to light a couple of weeks ago with my scope zeroed at 35 yards I stalked within 30 yards of a rabbit and confidently took the shot after placing the cross hairs between its ear and eye. Imagine my dismay when I saw the pellet impact a good two inches high in some bushes behind my target. A few test shots later and it's confirmed my zero is high.

    Now the only thing I have changed for my initial zero is the parralax setting (wound down for close range shots and up for spotting) could this be my cause ? Anyone else had this ?
     
  2. r10hunter

    r10hunter Honorary Member

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    It should not really be possible to get a change in poi due to parallax regardless of where you set the AO ring or where you put your head.
    It would be worth going out for a plinking session and testing if you are really getting a change in poi according to AO setting.
    So as to rule out other things like movement of the scope mounts, movement of the barrel ect.
    If your poi is moving According to the AO setting something is wrong and the scope needs to go back.
    Cheers Andy
     
    Last edited: Jun 7, 2015
  3. john79

    john79 Very Active

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    Is it a pcp ? Could be the temperature changing and causes the zero to shift warm weather a pcp will produce higher muzzle velocity
     
  4. Meteor62

    Meteor62 Major Poster

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    Mmmm don't you mean co2? If my main hunting pcp can't be relied on due to varying temperatures I may as well bin it as it's not fit for the job.
     
  5. john79

    john79 Very Active

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    Yes pcp ** is the barrel attached to the air tube ? Or fully floating?is the air tube touching the stock?
     
    Last edited: Jun 7, 2015
  6. Meteor62

    Meteor62 Major Poster

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    It's a hw100 and when checked later on a not warm day poi was still high
     
  7. john79

    john79 Very Active

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    Take the oring out the barrel band and try that
     
  8. john79

    john79 Very Active

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    you didn't say what scope you was using ?
     
  9. Meteor62

    Meteor62 Major Poster

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    Shouldn't I simply alter my zero to compensate?
     
  10. Meteor62

    Meteor62 Major Poster

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    Hawke panorama 3-9x40 AO Ir half mil
     
  11. r10hunter

    r10hunter Honorary Member

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    Whoops thought you were using a NV scope by the section we are in. It is possible you could get a little parallax error on that.
    Cheers Andy
     
  12. Meteor62

    Meteor62 Major Poster

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    Sorry I just saw optics didn't realise it was nv
     
  13. metalman

    metalman Big Poster

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    Forgive my ignorance, but why would you alter parallax settings for different ranges. Altering mag setting after zero will alter poi at different ranges
     
  14. Meteor62

    Meteor62 Major Poster

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    To bring them into focus is the reason I alter it.
     
  15. M5AFX

    M5AFX Donator

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    when i zero mine i never adjust anything ...not mag or range..i just use it as is and estimate the range then use the mil dots
     
  16. terry1001

    terry1001 Major Poster

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    Parallax errors would normally show up as random flyers so if you're getting decent groups (although with a different poi) it should be enough to re-zero and carry on from there. It may be that something has happened to move the scope or perhaps the barrel so if you're happy that it's all tightened up firmly the re-zero and make sure that you check it before each session just in case. It is possible for something inside the scope to come loose so regular checks will catch any future changes which would mean that you'd be looking for a new scope, hopefully it's not that serious.
     
  17. mitigator

    mitigator Busy Member

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    Changing the magnification or "paralax" (focus) shouldn't / doesn't change point of aim.
     

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