fisheye question that has bugged me.

Discussion in 'Photography Beginners' Forum' started by osirus, Jun 8, 2008.

  1. osirus

    osirus TPF Noob!

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    Well the next lens i want to get is a nice fisheye lens.

    Now theres one thing that i noticed long ago when reading up on them
    and ive never understood fully..

    ok.
    So focal lengths with lenses.
    less mm = wider fov.

    now, i see fisheyes.
    one says its 10.5mm
    one says 8mm
    one says 4.5mm

    Yet they all say they give a 180 degree fov image.
    so.. does that mean the 10.5mm fisheye is just as wide as the 4.5mm fisheye?

    and if so.. why the different numbers?
     
  2. Josh66

    Josh66 Been spending a lot of time on here!

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    Well, I could be wrong - but I don't think you're going to find any lenses that can see behind you (fov>180 deg).

    I think 180 degrees is the limiting factor here, and the longer fisheyes are just 'cropped' more.
     
  3. osirus

    osirus TPF Noob!

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    well the old 6mm Nikon fisheye had a 220 degree fov so it is possible to go over 180.


    [​IMG]


    [​IMG]
     
  4. Josh66

    Josh66 Been spending a lot of time on here!

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    Hmm... Didn't know that, still seems kinda odd though. Wouldn't your tripod or feet show up in a picture with a 220 degree fov?
     
  5. osirus

    osirus TPF Noob!

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    Yeah i think it would be quite hard not to get them to show up..
     

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