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  1. #1
    brucegooglegroups's Avatar
    brucegooglegroups Guest

    Default Wide angle and FOV



    In binoculars, what is the definition of wide angle? For example, the
    Orion Scenix 7x50s have a slightly larger FOV than the Scenix 10X50's
    which are considered "wide angle".

    Bruce


  2. #2
    Alan French's Avatar
    Alan French Guest

    Default Wide angle and FOV

    "brucegooglegroups" <brucegooglegroups@hotmail.com> wrote in message
    news:1160693896.712257.316860@b28g2000cwb.googlegr oups.com...

    Bruce,

    In the world of advertising, it's hard to say <g>.

    Generally, lower magnifications yield a wider true field. In terms of FOV,
    the Scenix 10x50s do have a somewhat wider field than many 10x50s, and I
    think that is why they advertise them as "wide angle." Binocular eyepieces
    generally provide an apparent field of from 50 to 67 or so degrees, and the
    Scenix must have an eyepiece with an apparent field near the higher end. I
    think it would be reasonable to think of any binocular with an eyepiece with
    an apparent field aroudn 67 degrees as "wide angle."

    Clear skies, Alan


  3. #3
    Sam Wormley's Avatar
    Sam Wormley Guest

    Default Wide angle and FOV

    brucegooglegroups wrote:

    Look at the table down about half way on this web page... shows FOV
    for various binoculars.
    http://edu-observatory.org/eo/binoculars.html


  4. #4
    Mike L'Mao's Avatar
    Mike L'Mao Guest

    Default Wide angle and FOV





    Ummm..why are you mentioning AFOV when it really means nothing??

    The scenix the OP'r talks of are 6 and 7 degrees FOV. Which are astounding.
    My bushnell 10X50's have a meager 5.5 deg.



  5. #5
    Mike L'Mao's Avatar
    Mike L'Mao Guest

    Default Wide angle and FOV



    Ooops...7 degs for each rather.



  6. #6
    Llanzlan Klazmon the 15th's Avatar
    Llanzlan Klazmon the 15th Guest

    Default Wide angle and FOV

    "Mike L'Mao" <LMAO@telusplanet.com> wrote in
    news:QYBXg.11652$P7.1961@edtnps90:


    A greater AFOV allows you to get the same TFOV with a smaller exit pupil.
    That's why.

    Klazmon.

  7. #7
    Alan French's Avatar
    Alan French Guest

    Default Wide angle and FOV

    "Mike L'Mao" <LMAO@telusplanet.com> wrote in message
    news:QYBXg.11652$P7.1961@edtnps90...
    astounding.

    A larger AFOV translates into a wider true field. The true field is
    approximately the apparent FOV divided by the magnification. At a given
    magnification, a larger AFOV means a larger true field. You aren't going to
    have a "wide angle" binocular with an AFOV of 50 degrees.

    Clear skies, Alan


  8. #8
    Mike L'Mao's Avatar
    Mike L'Mao Guest

    Default Wide angle and FOV



    Fine but I don't think most people know that. You didn't give the relation
    between
    AFOV and FOV in your answer to the OP'r.



  9. #9
    Willie R. Meghar's Avatar
    Willie R. Meghar Guest

    Default Wide angle and FOV

    Bruce asked:


    Alan French wrote:


    Mike L'Mao responded:


    I think most knowledgeable individuals would be satisfied with Alan's
    suggestion. It makes far more sense to respond to the original
    question in terms of apparent field than in terms of true field.

    AFOV = TFOV multiplied by Magnification

    where AFOV is 'Apparent Field Of View' and TFOV is 'True FOV'.

    By using AFOV, the definition remains the same for *any* (such as:
    7x35, 8x42, 9x63, 10x50, 11x80, 20x80, 25x100, 25x150, etc.)
    binocular.

    Willie R. Meghar
    Observational Notes at:
    http://meghar.blogspot.com/

  10. #10
    Bob May's Avatar
    Bob May Guest

    Default Wide angle and FOV

    Pick nits fine enough and you'll be reading 20K of writing just to get
    across a simple point.
    In other words, don't assume that the OP doesn't know at least some of the
    terminology used and if he doesn't happen to know, let him find out rather
    than demand it from those who answer. IN other words, if YOU don't know,
    first go find out what it means and only ask if you can't find it out.

    --
    Yeppie, Bush is such an idiot that He usually outwits
    everybody else. How dumb!



 

 
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