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Thread: Which 8x56 binoculars ?

  1. #1
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    Which 8x56 binoculars ?

    In the mood for a little optics optimisation and looking at acquiring a pair of 8x56 binoculars.

    Minox would probably be my first choice.

    Burris Montana 8x56 look good but are perhaps a little heavy.

    Barr & Stroud have a large range in this specification, but how to choose between the different types, is there any difference between them ?

    There seem to be many look-alike / made-alike brands in the budget bracket.

    What do you have in daily use ?

  2. #2
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    I wouldn't buy 8x56 binoculars. To heavy and cumbersome for stalking IMO.
    Nooooooooooooobody expects the Spanish Inquisition!! Our main weapon is.........

  3. #3
    i use 10x50 leica ultravids and i like them , they are big but worth there weight in gold in low light. zeiss do a 8x56 i think i saw an ex demmo set in maclouds of tain website for just over a grand !

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  4. #4
    Why ?????????????

    8x42 yes 10x42 if you have steady hands but 8 x 56 why would you ? There are a few reasons why 42 is the most commonly used size

  5. #5
    Quote Originally Posted by splash View Post
    Why ?????????????

    8x42 yes 10x42 if you have steady hands but 8 x 56 why would you ? There are a few reasons why 42 is the most commonly used size
    For optimum low light performance.......56/8=7

    Exit Pupil
    If you hold your binoculars at arms length and look at the centre of the eyepiece lens, you can see a small circle of light. This is called the 'exit pupil' and is illustrated in the left figure.

    All the light leaving the binoculars is transmitted through the exit pupil, the diameter of which is determined by the ratio of objective lens diameter and magnification.

    For example:

    Exit pupil = Objective lens diameter/Magnification

    For a 7x26, the Exit pupil diameter = 26/7 = 3.71mm,
    But for a 7x50, Exit pupil diameter = 50/7 = 7.14mm.

    Hence increasing the diameter of the objective lens increases the size of the exit pupil and the amount of light entering the eye. During daylight hours when the eye pupil is only about 2-3mm dilated, you would see no difference in brightness between a 7x26 and 7x50. However, as the light levels drop, the eye pupil can dilate up to a maximum of 7mm. In these conditions the 7x50 would provide a brighter image than the 7x26. Hence binoculars with a large exit pupil are more suitable for astronomy and use in low light levels.
    Last edited by 2130martin; 09-08-2013 at 13:52. Reason: additional information added

  6. #6

  7. #7
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    Thanks, K., looking for information and advice from members with direct experience of particular models.

    Appreciate that 8x56 may not be a universal choice. Reminds me that one member on here uses 10 - 15X50's held in one hand, lying on his back, looking downhill to see what's got up in the morning !
    Last edited by Spix; 09-08-2013 at 14:15. Reason: Attribution

  8. #8
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    Quote Originally Posted by 2130martin View Post
    For optimum low light performance.......56/8=7

    Exit Pupil
    If you hold your binoculars at arms length and look at the centre of the eyepiece lens, you can see a small circle of light. This is called the 'exit pupil' and is illustrated in the left figure.

    All the light leaving the binoculars is transmitted through the exit pupil, the diameter of which is determined by the ratio of objective lens diameter and magnification.

    For example:

    Exit pupil = Objective lens diameter/Magnification

    For a 7x26, the Exit pupil diameter = 26/7 = 3.71mm,
    But for a 7x50, Exit pupil diameter = 50/7 = 7.14mm.

    Hence increasing the diameter of the objective lens increases the size of the exit pupil and the amount of light entering the eye. During daylight hours when the eye pupil is only about 2-3mm dilated, you would see no difference in brightness between a 7x26 and 7x50. However, as the light levels drop, the eye pupil can dilate up to a maximum of 7mm. In these conditions the 7x50 would provide a brighter image than the 7x26. Hence binoculars with a large exit pupil are more suitable for astronomy and use in low light levels.
    Thanks, exactly that. S

  9. #9
    Quote Originally Posted by Spix View Post
    Thanks, K., looking for information and advice from members with direct experience of particular models.

    Appreciate that 8x56 may not be a universal choice. Reminds me that one member on here uses 10 - 15X50's held in one hand, lying on his back, looking downhill to see what's got up in the morning !
    You forgot the single stick!

    There is a little used pair of 8X56 Zeiss milk bottles in a Tunbridge Wells (Pantiles) photogaphic shop for 1K which is far too much but they may come down ............

    K

  10. #10
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    Quote Originally Posted by Klenchblaize View Post
    These are said to be very good value:
    http://www.vortexoptics.com/product/...8x56-binocular
    K
    Useful, seems that Vortex offer an unlimted lifetime warrenty.

    UK links :

    http://www.newprouk.co.uk/vortex/cat...inoculars.html

    http://www.riflecraft.co.uk/rifles/binoculars-60.aspx

    Has anyone picked their way through the plethora of Barr & Stroud variations ? They are all Chinese made.

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