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  1. #11

    Join Date
    Jan 2008
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    Well it's not entirely about DoF. The idea is to find the aperture that will give you the sharpest image for the depth of field required. It's a trade-off between a small enough aperture to create the DoF you want and the diffraction caused by stopping down too far. Since I saw this my taking technique has been to find the bellows extension difference between near and far and then consult the chart for the "best" aperture. My shutter speed falls out of all that. Kinda like Large Format Aperture Priority!!!!
    "Why is there always a better way?"

  2. #12
    keithwms's Avatar
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    Oct 2006
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    Bob, for LF my strategy is this. Starting with a wide aperture I focus and then attempt to gain sufficient coverage and sufficient effective depth of field via tilts and shifts. Failing that I stop down. Then... rinse, repeat... no formulas, no math In LF you are almost always working on issues other than resolution.

    f/22 is certainly already incurring diffraction softening. Most LF lenses are giving maximum resolution values across the frame at around f/16 or even f/11. Indeed f/22 is the aperture at which the lens typically reaches highest coverage, not the highest resolution across the image circle.

    In MF, lacking the tilts, you wind up stopping down more than would be necessary if you did have tilts. C'est la vie.
    "Only dead fish follow the stream"

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  3. #13

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    Apr 2004
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    Vancouver, BC
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    This article on the LF photography site covers what you're looking for, and there are links to the Photo Techniques article under "References" at the bottom of the page:

    http://www.largeformatphotography.info/fstop.html

    Jim

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