Fixed parallax?

Discussion in 'Long Range Scopes and Other Optics' started by KiloTango, Feb 19, 2014.

  1. KiloTango

    KiloTango Active Member

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    I notice several high end scopes with fixed parallax...how limiting is this? Do you notice it? Does it affect how you aim at longer ranges? I've only ever had scopes with adjustable parallax...what do you gain and lose with fixed versus adjustable parallax?
     
  2. 42769vette

    42769vette Well-Known Member

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    Examples? Im not aware of very many high end scopes that do not have adjustable parallax.
     

  3. KiloTango

    KiloTango Active Member

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    I've been looking at scopes in the 2-10x range, and there are Schmidt and bender scopes without parallax adjustment, the nightforce 2.5-10x32mm doesn't have parallax adjustment, some Zeiss duralyt, etc.
     
  4. 42769vette

    42769vette Well-Known Member

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  5. bruce_ventura

    bruce_ventura Well-Known Member

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    Parallax error is caused by not centering your eye and it increases with range and objective size. If you are considering a 2.5-10X32 scope, parallax error may not be a big issue. You can mitigate the problem for long range targets by increasing the magnification up to the max (10X). That reduces the exit pupil down to 3.2 mm, forcing your eye to be closer to the center. The worse case parallax error will be about 1 cm at 200 yds and 4 cm at at 500 yds (assuming a 100 yd parallax setting). With a little training, you can do even better.
     
  6. Greyfox

    Greyfox Well-Known Member

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    Unless the eye is radically misaligned with the scope I have found that PA has not been an issue with quality scores of 14x or less, at least for mid range work. Above that power, I would want PA.
     
  7. lloydsmale

    lloydsmale Well-Known Member

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    Im not a 1000 yard competitor more of a 500 yard deer hunter. to me if a scope is over 10x and or the range is out past 400 yards it can benifit from a ajustable paralex.