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Thread: FL question,,,,,,

  1. #1

    Join Date
    Mar 2008
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    134

    FL question,,,,,,

    Best FL for shooting portraits on a 5x7 back. Any lens suggestions?

  2. #2

    Join Date
    Dec 1999
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    1,904

    Re: FL question,,,,,,

    Studio portraits, environmental portraits, both ???

    Not having any context I would say 240-300mm for studio, 125-180 or so for environmental portraits


    just guessing.

    steve simmons

  3. #3

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    Mar 2008
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    134

    Re: FL question,,,,,,

    Steve,
    Thanks for the reply. Those are the FL's I was considering as well. I'm after studio portraits for the most part w/ the goal of making contact prints using alternative processes. The camera I'm looking at now (Deardorrf 5x7 View) apparently only offers 24in of extension (according to K Hough's website), so I'm concerned that it may not be suitable. Why do you recommend a shorter FL for Evironmental work?

  4. #4

    Join Date
    Dec 1999
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    1,904

    Re: FL question,,,,,,

    to get more of the person's surroundings if that is what you want. But I am just guessing.

    steve

  5. #5

    Join Date
    May 2006
    Location
    Sillycon Valley, CA
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    268

    Re: FL question,,,,,,

    Quote Originally Posted by BigSteveG View Post
    The camera I'm looking at now (Deardorrf 5x7 View) apparently only offers 24in of extension (according to K Hough's website), so I'm concerned that it may not be suitable.
    24 inches is around 600 mm. I would think that would be plenty of bellows draw for the longer focal lengths suggested by Steve.

    -Darren

  6. #6

    Join Date
    Mar 2008
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    134

    Re: FL question,,,,,,

    Darren,
    Thank You!!! The question I had asked a few days ago was how to figure max focal length from a given bellows size. So what is the multiplication factor? approx x3?

  7. #7

    Join Date
    Feb 2005
    Posts
    2,952

    Re: FL question,,,,,,

    Quote Originally Posted by BigSteveG View Post
    Darren,
    Thank You!!! The question I had asked a few days ago was how to figure max focal length from a given bellows size. So what is the multiplication factor? approx x3?
    At life size, 1:1, the bellows extension is twice the FL. So with 600mm of bellows you could go to life size with a 300mm lens.

    OD = object distance, ID = image distance

    The thin lens equation: 1/FL = 1/OD + 1/ID

    magnification = ID/OD

  8. #8
    Big Negs Rock!
    Join Date
    Mar 2000
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    Pasadena
    Posts
    1,157

    Re: FL question,,,,,,

    A rule of thumb for millimeters to inches is: 25mm=1 inch. Approximately.
    Mark Woods

    Large Format B&W
    Cinematography Mentor at the American Film Institute
    Past President of the Pasadena Society of Artists
    Director of Photography
    Pasadena, CA
    www.markwoods.com

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