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  1. #11

    Join Date
    Mar 2005
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    Central NC
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    Quote Originally Posted by Shaggysk8 View Post
    This is probably stupid question. But large format lenses look more Convex then medium format and 35mm, I might be wrong in this, but if so why?
    Different designs for different requirements. Small format users differ from large format users in a few key requirements. First, small format cameras have a fixed relationship between the lens plane and the film plane. This changes lens designs markedly (especially when you have to clear a swinging mirror).

    Second, most small format users are handholding. This implies the need for speed, which in turn implies the need to shoot wide open and at apertures near wide open. Most LFers are bound to their tripods and tend to shoot at apertures in the f/16 and smaller range. This requirement changes lens designs too, in that the designer can't count on smaller apertures to minimize aberrations, and has to design the lens to be sharper wide open and have better off-axis light fall-off characteristics.

    Third, LF use requires much larger image circles to allow for view camera movements.

    What you end up with is that LF lenses tend to be simpler, and tend to be closer to symmetric designs. Small format lenses tend to be asymmetric and considerably more complicated.
    Bruce Watson
    AchromaticArts.com

  2. #12
    Ian Grant's Avatar
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    Aug 2004
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    Quote Originally Posted by Bruce Watson View Post

    What you end up with is that LF lenses tend to be simpler, and tend to be closer to symmetric designs. Small format lenses tend to be asymmetric and considerably more complicated.
    That also goes for 35mm & 120 Range-finder camera lenses as well, particularly wide angle lenses, and these lenses often have better performance and less distortion, and are cheaper to manufacture.

    Ian

  3. #13
    TheFlyingCamera's Avatar
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    May 2005
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    Yes- compare the price of two lenses with comparable fields of view - which costs more, a 75mm f6.8 for 4x5 or a 21mm f2.8 for 35mm? I want to say I paid about $450 for my Rodenstock 75 f6.8 and about $600 for my Contax 21mm f2.8. Both used. Both in EX+ condition.

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