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Question basic zoom scope question ? parallax

Discussion in 'Anything Airgun Related' started by Westphalian, Apr 20, 2014.

  1. Westphalian

    Westphalian Donator

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    never really bothered with playing with my zoom, keeping it on 10x but want to take it down to 6x when my nitesite is attached.
    why does the POI change on different zoom mags?
    to be honest i have never really got my head round optics and i could never explain parallax error to anyone so please keep it simple. thanks guys.
     
  2. oliver13

    oliver13 Donator

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    I think it's basically a fault with the scope, it's not parallax error - that's when the POI changes with eye position.
     
  3. landymick

    landymick Big Poster

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    Some scopes do in fact change POI with different mag changes.A lot depends if its a first focal plane or second focal plane scope.I have found the cheaper end scopes show this more but expensive ones are not immune.
     
  4. Tripleteer

    Tripleteer Donator

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    What scope is it??
     
  5. r10hunter

    r10hunter Honorary Member

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    You are talking about change of poi at your zero range with the central cross when you shift magnification.??
    If so that is due to a greater than normal tolerance in some of the internal components. ( the zoom tube rotating around the cross hair is not within tight enough tolerance) it's common on a lot of cheaper scopes to a small degree.
    If it's an extensive amount and the scope is under any warranties end it back.

    If you mean other aim points like Mildots or lines (not the central cross) change poi vertically as you zoom, that is normal in a second focal plane scope.
    The only way around it is to buy a first focal plane scope (expensive)
    Cheers Andy
     
    Last edited: Apr 20, 2014
  6. terry1001

    terry1001 Major Poster

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    When you change the zoom or refocus a scope you're moving lenses inside the tube, if (as Andy said) there is play in the mechanism or the lenses aren't ground perfectly then there will be an alteration to the line of sight through the scope. This is unfortunate but unavoidable, normally the amount isn't enough to cause problems. You can check it out by clamping the gun (or scope) firmly in a vice etc and watching through the scope as you make changes.
    Mil dots and other multi aim points will change with the zoom, you can easily see the effect of this by using Chairgun Pro. Basically if this is your problem you will have to re-learn all your aim pints/holdover at the different zoom. Make sure that you always return it to the same point each time if you want the best results.
     
  7. warrenater

    warrenater Donator

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    good advice above but i would just like to add if you are thinking of buying a ffp scope that would not necessarily be a good move as they are expensive scopes and as such probably have good coatings on the lenses , the problem here is that these coatings will inevitably block out some of the infra red light that your night site uses. far better to use you scope on 6 x mag then zoom back in to 10 times to make the shot or as terry suggests re-learn all your aim pints/holdover at the different zoom. if it helps you could always fix a fishing breakaway coaster to your zoom ring to make it easier to tell the zoom in the dark . atb gary
     
  8. Westphalian

    Westphalian Donator

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    Its a nikkostirling nighteater 6-24x56ir
     
  9. Westphalian

    Westphalian Donator

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    Cheers guys. So, seems to be a fault. Never mind, i will just zoom back to 10x before i shoot.
    Another problem i found last night is that the NS50 works great on my nighteater but had it on my hawke sidewinder 10x42 (non zoom) and it was like looking thru bright mist. I thought it might be the coatings warrenater describes?
     
    Last edited: Apr 20, 2014
  10. r10hunter

    r10hunter Honorary Member

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    Possible, but I use NV gear on a couple of heavily coated scopes. A S/B and a lightstream all I notice is a very slightly shorter range of use than a non coated lens of cheaper scope of the same mag range and objective lens (maybe).
    Your mist issue sounds more like a reflection of ir light off of something close like a moderator, or a focus issue. The more mag the more issues you get with add on NV.
    Cheers Andy
     
    Last edited: Apr 20, 2014
  11. Westphalian

    Westphalian Donator

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    Cheers, you were right, it was the long A&m custom moderator causing a reflection.
    Actually the camo wrap on the silencer causing the problem which is now solved with the wrap off and the matt black finish. Cheers guys, great help
     
    Last edited: Apr 20, 2014

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