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Thread: Bellows extension Question, 300mm lens with 5x7 format

  1. #1

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    Mar 2008
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    Bellows extension Question, 300mm lens with 5x7 format

    I'm trying to get an 8x10 kit together and in the interest of economizing on lens selection, I was considering using my schneider 300mm lens with 5x7 and 8x10.

    They will be separate cameras and the 5x7 camera has a rail length of 52cm, will this be sufficent for half length and head and shoulders portraits with the 300mm on 5x7?

    I guess I could look for a longer rail if needs be, but I'm not sure the bellows would stretch. Is there a formula or something to work this out. I don't have the 5x7 camera to hand, otherwise I'd just check it

    thanks

    D

  2. #2

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    Sep 2004
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    Re: Bellows extension Question, 300mm lens with 5x7 format

    D

    I don't know the math but I use a 300mm on my 5x7 for this type of work and never get out to 52cm of extension for head and shoulders compositions.

  3. #3

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    Re: Bellows extension Question, 300mm lens with 5x7 format

    See http://www.kenleegallery.com/html/tech/bellows.php

    If your camera can extend to 450mm, then it can make a 1:2 magnification with a 300mm lens.

    For 5x7 film, a subject at 50% magnification will be 10x14 inches. That's head and shoulders.

    (450-300) / 300 = 150/300 = 1/2 or 1:2

  4. #4

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    Aug 2013
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    Re: Bellows extension Question, 300mm lens with 5x7 format

    50cm of extension, film to lens, on my camera gives about a 18x28cm field. Remember that film to lens distance will always be somewhat short of rail length.

  5. #5

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    Mar 2008
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    Re: Bellows extension Question, 300mm lens with 5x7 format

    great stuff guys thanks, a mine of information as usual, cheers, Damian

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