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Thread: ND sanity check

  1. #1
    ryanmills's Avatar
    Join Date
    Oct 2012
    Spokane, WA

    ND sanity check

    Just want to make sure im thinking about this right. If im using iso 400 speed film and a 3 stop ND filter, i should be metering at iso 50?

  2. #2
    C. D. Keth's Avatar
    Join Date
    Apr 2006
    Salt Lake City, UT

    Re: ND sanity check

    Yup, that's right.

    3 stops means you half your ISO three times. 400-once>200-twice>100-thrice>50

  3. #3
    Preston Birdwell
    Join Date
    Feb 2007
    Columbia, CA

    Re: ND sanity check

    This is true for an ND filter that affects the entire negative. If it's a Graduated ND then you would not adjust the ISO, but you'd need to see if the filter will provide the correct exposure for that portion of the negative that is affected by the additional density.

    Preston-Columbia CA

    "If you want nice fresh oats, you have to pay a fair price. If you can be satisfied with oats that have already been through the horse; that comes a little cheaper."

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