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Is the Yukon Photon Parallax error free

Discussion in 'Anything Airgun Related' started by FX, May 19, 2015.

  1. FX

    FX Donator

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    as per title, does anyone know, google has not been my friend here.
     
  2. Tinbum

    Tinbum Delusions of adequacy

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    Yes, the crosshairs are just superimposed onto a TV screen, so parallax error is not possible.
     
  3. richardscar

    richardscar Donator

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    I have noticed if I move my head while looking at a target with mine the ret does seem to move off target ? hth . Iris on or off zero changes . Doubler on and massive shift in zero . Some one suggested in the past and I have also asked the question . Does the zero change from day to night ? I am not sure. atb, rich.
     
  4. terry1001

    terry1001 Major Poster

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    As soon as you put an extra lens in the system it is almost certain that the optical path will be altered resulting in a zero shift. Doublers which can't be re-fitted in EXACTLY the same place every time will be a constant source of problems, if it's permanently fitted it won't be an issue. With some it may be just a couple of clicks that you can sort out easily when you check zero before a shooting session.
    The other matters relate to focus. Focussing will be different with ir light to white light so if you don't use an ir pass (or at least a dark red) filter in front of the scope for daylight shooting the focus will change from day to night. If you're not properly focussed on the target then you may well introduce parallax error. Obviously you do need to have the eyepiece correctly focussed on the reticle as well but the reticle and target are superimposed on the same screen and there will be no relative movement between them.
     
  5. richardscar

    richardscar Donator

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    Thanks for that Terry , informative and useful as ever. I am sure I can make the crosshair seem to move in relation to the target if I look slightly off centre through the scope . On the matter of focus though, with different types of light , does this mean if I am very careful to achieve constant eye positioning, then focus should be less of a problem parallax error wise ? I do use a 20mm iris(butler creek hole cut !!) to increase depth of field but I am not so sure if this is completely immovable , unlike my doubler which has the "holder" bonded to the objective and the lens assembly screws into this on a very fine thread.
     
  6. terry1001

    terry1001 Major Poster

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    A front mounted 'iris' should not have any effect on the optics of the scope unless it were tiny and mounted right at the edge. If you don't use an ir pass filter of some sort in daylight then focussing may well become an issue even with any additional depth of field provided by the iris fitment. Another side effect is caused by the camera being set for optimum performance in the dark because as the light levels increase the camera will struggle to cope unless the light reaching the sensor is considerably reduced, preferably by fitting some form of ir pass filter.
    As with any type of scope it is sensible to get it focussed correctly in order to get the best results and this is more important with night vision where large aperture lenses have to be used in order to get maximum light transmission. I always use the same method, point the scope at a plain wall, grey cloudy sky etc and focus the reticle until its completely sharp (only look at it for a couple of seconds at a time or your eye will compensate for some blurring) and then leave it alone and focus the target with AO or side focus.
     
  7. richardscar

    richardscar Donator

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    I hope all this information has helped the OP too ?
     
  8. FX

    FX Donator

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    Very helpful
    Thanks all.
     

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