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  1. #11
    ParkerSmithPhoto's Avatar
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    Thanks everyone. Very much appreciated!
    Parker Smith Photography, Inc.
    Atlanta, GA

    Commercial & Fine Art Photography
    Portrait Photography

  2. #12

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    Quote Originally Posted by polyglot View Post
    doublepluss on Van Walree. It's an excellent reference that explains all the major issues with lenses nicely.
    Very interesting! I have not seen this before.

    Thanks for sharing, Polyglot.

  3. #13
    polyglot's Avatar
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    'twasn't me that posted the link here! I'm merely agreeing with it. It's one of the references listed in my FAQ.

  4. #14

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    A bit of playing around on www.dofmaster.com should tell you what you need - note the depth of field of your medium format at the settings you use, then input your 35mm setup and adjust the options until you get a similar dof

  5. #15
    wiltw's Avatar
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    First one needs to start off with a common basis for FOV, negating the differences in aspect ratio...
    • 135 format using 48mm as lens on 135 format and
    • RZ67 using 112mm on RZ67
    • 4x5 format using 192mm on 4x5 format

      (all three equate to 2 * short dimension of frame)...



    Using the DOF calculator available on Cambridge Color web site, and using 20/20 visual acuity (rather than the much more tolerant 'manufacturer standard')

    • 48mm f/5.6 focused at 100' yields DOF zone 67'-197'
    • 112mm f/8 focused at 100' yields DOF zone of 69'-179'; f/11 DOF zone 62'-252'
    • 192mm f/16 focused at 100' yields DOF zone 66'-211'
    Last edited by wiltw; 05-10-2013 at 06:31 PM. Click to view previous post history.

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