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Thread: Depth of Field

  1. #1
    Krzys's Avatar
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    Depth of Field

    I seem to have fallen in love with f/4 on my Canon 50mm f/1.4 FD. My question is that what aperture on my (medium format) Mamiya Sekor C 80mm will give the same depth of field as the (small format) 50mm at f/4 and what is the sharpest point for the lens?

  2. #2
    Herzeleid's Avatar
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    I find this site quite useful for DOF, www.dofmaster.com
    No idea with Mamiya Sekor.

  3. #3
    Rolleijoe's Avatar
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    Those lenses are totally different. So their bokeh won't exactly be the same. Experience is the best teacher, just shoot a roll and see if it gives you want you're looking for.
    If the lens doesn't read "ZEISS", then it just isn't.

  4. #4

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    I agree. It might be f/5.6 or f/8, but either way, different lens designs will yield different characteristics. It's one of those things that you'll only learn through experience -- often known as trial and error (or in my case, just error).

  5. #5
    Nicholas Lindan's Avatar
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    The same DOF at ~f6.8, but experiment with a roll of film and find the one you like the best.

    Optimum resolution should be around f11 +/- 1 stop. Print out a resolution chart and put it in the test roll you shoot, above. Finding the best aperture doesn't require anything fancy in a resolution chart, it's pretty obvious where the sharpest apertures are.
    DARKROOM AUTOMATION
    f-Stop Timers - Enlarging Meters
    http://www.darkroomautomation.com/da-main.htm

  6. #6
    mweintraub's Avatar
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    Plus the distance from the subject changes the DOF.

  7. #7
    ic-racer's Avatar
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    A good rule of thumb is to match absolute aperture size; ie around 12mm. You can look in the lenses side-by-side and get a rough guide. You can also calculate it as others have indicated (around f6 to f7 on your 80mm).



 

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