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Thread: Why are lenses never measured in square format ?

  1. #11
    ic-racer's Avatar
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    Re: Why are lenses never measured in square format ?

    Quote Originally Posted by alex from holland View Post
    I am just wondering
    Why are lenses never mesured in quare formats.
    We always talk about lenses suitable for 4 x 5, 8 x 10, etc.
    But they actually cover 5 x 5 or 10 x 10.


    Alex
    Square format film, film holders and camera backs are not common. Why fit a lens to a format that does not exist.

  2. #12

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    Re: Why are lenses never measured in square format ?

    Quote Originally Posted by Leigh View Post
    How about basic trigonometry?

    Diagonal = sqrt( a^2 + b^2 )

    5^2 + 5^2 = 25 + 25 = 50; sqrt( 50 ) = 7.071

    4^2 + 5^2 = 16 + 25 = 41; sqrt( 41 ) = 6.403

    - Leigh
    How about just multiplying the length of a side of a square by 1.414 (sqrt2) ? (Winking smiley)
    One man's Mede is another man's Persian.

  3. #13
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    Re: Why are lenses never measured in square format ?

    ic-racer,

    How about Hasselblads and Rollie TLR's?

    They are 6x6 square formats.

  4. #14
    ic-racer's Avatar
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    Re: Why are lenses never measured in square format ?

    Quote Originally Posted by Gem Singer View Post
    ic-racer,

    How about Hasselblads and Rollie TLR's?

    They are 6x6 square formats.
    This is the Large Format Forum

    Non-Large Format lenses are usually not listed with any coverage specification. Exceptions I know are some shift lenses and the Zeiss Luminars (which give a non-format-specified angle of view for each lens)

    OT: Another good reason why the Horseman 6x9 is a Large Format Camera: Not only do the lenses all have a published "coverage" specification, they display the image circle right on the lens barrel of each lens!

  5. #15
    8x10, 5x7, 4x5, et al Leigh's Avatar
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    Re: Why are lenses never measured in square format ?

    Quote Originally Posted by E. von Hoegh View Post
    How about just multiplying the length of a side of a square by 1.414 (sqrt2) ? (Winking smiley)
    That works for a square (a = b), but not for a rectangle (a <> b).

    I used the formula appropriate for the general case. (frownie)

    - Leigh
    If you believe you can, or you believe you can't... you're right.

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