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Thread: Large Format vs Medium Format Digital

  1. #1
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    Large Format vs Medium Format Digital

    Well thanks to everyone who helped with the planning and analysis of the testing. All of the results and analysis are now up at

    http://www.landscapegb.com/issues/lgb-0028/

    The bottom line? 8x10 rules the roost and the challenge is really 4x5 vs IQ180 - personally I think the 4x5 wins but it's close..

    Tim

    p.s some interesting conclusions about differences between 10x8 and 4x5 in my report bit (i.e. almost no difference in resolution once you stop down to an equivalent depth of field of f/32 on 4x5).
    Still Developing at http://www.timparkin.co.uk and scanning at http://cheapdrumscanning.com

  2. #2

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    Re: Large Format vs Medium Format Digital

    Quote Originally Posted by timparkin View Post
    (i.e. almost no difference in resolution once you stop down to an equivalent depth of field of f/32 on 4x5).
    What constitutes an "equivalent" DoF?

    DoF calculations include a fudge factor called the Circle of Confusion, which changes with negative size, getting bigger with larger formats.

    - Leigh

  3. #3
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    Re: Large Format vs Medium Format Digital

    Quote Originally Posted by Leigh View Post
    What constitutes an "equivalent" DoF?

    DoF calculations include a fudge factor called the Circle of Confusion, which changes with negative size, getting bigger with larger formats.

    - Leigh
    I've worked it out based on the same visible depth of field in the image - i.e. so all of the images look the same. (so CoC will scale with sensor size).
    Still Developing at http://www.timparkin.co.uk and scanning at http://cheapdrumscanning.com

  4. #4

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    Re: Large Format vs Medium Format Digital

    Wow Tim, a lot of testing obviously, your efforts are appreciated by all. The use of the 80x stereo microscope was helpful with showing absolute film resolution and I'm sure us 8x10 and other Large Format photogs are not surprised.

  5. #5
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    Re: Large Format vs Medium Format Digital

    Thanks Dsim!
    Still Developing at http://www.timparkin.co.uk and scanning at http://cheapdrumscanning.com

  6. #6

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    Re: Large Format vs Medium Format Digital

    I don't understand any of this!
    Can you see any difference between any of these in a 16x20/24 print?
    Wilhelm (Sarasota)

  7. #7

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    Re: Large Format vs Medium Format Digital

    Hi Tim,
    Do you think Portra is resolving much more fine detail than Velvia? Looks like it to me... or is it because of the 400 ISO vs. 50 ISO that allows for faster shutter speeds? I'm talking about the landscape shots. If Portra is better, than Portra 160 looks like it would kick ass in the studio with 8x10. I'm still messing with Provia chromes...

  8. #8
    Joshua Tree, California
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    Re: Large Format vs Medium Format Digital

    I don't believe it for a minute. My 33 megapixel Leaf Aptus 75S is just a shade behind 4x5 in terms of resolution. Dynamic range..no contest.

  9. #9
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    Re: Large Format vs Medium Format Digital

    Quote Originally Posted by Bill_1856 View Post
    I don't understand any of this!
    Can you see any difference between any of these in a 16x20/24 print?
    Just look at the pretty pictures then ;-) I've talked about print assessment in my editors conclusions. And yes you can tell a difference.
    Still Developing at http://www.timparkin.co.uk and scanning at http://cheapdrumscanning.com

  10. #10
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    Re: Large Format vs Medium Format Digital

    Quote Originally Posted by Robert Jonathan View Post
    Hi Tim,
    Do you think Portra is resolving much more fine detail than Velvia? Looks like it to me... or is it because of the 400 ISO vs. 50 ISO that allows for faster shutter speeds? I'm talking about the landscape shots. If Portra is better, than Portra 160 looks like it would kick ass in the studio with 8x10. I'm still messing with Provia chromes...
    Yes Portra does seem to out resolve chromes and Portra 160 out resolves Portra 400
    Still Developing at http://www.timparkin.co.uk and scanning at http://cheapdrumscanning.com

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