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  1. #51

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    Here is something I've always found quite useful on this topic. Talks about filters, factors, and light source. Now quite as strong as one would may like on how this all relates to specific films, other than ortho vs panchromatic.

    http://www.ohio.edu/people/schneidw/...s/295filtr.pdf

    ... and not at all useful for color work.

  2. #52
    RalphLambrecht's Avatar
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    Quote Originally Posted by brian steinberger View Post
    I always have accurate exposures metering through color filters with my Pentax digital spot.
    mine is thrown off by several stops when using a red or deep orange filter.I'm much better off with the filter factors
    Regards

    Ralph W. Lambrecht
    www.darkroomagic.comrorrlambrec@ymail.com[/URL]
    www.waybeyondmonochrome.com

  3. #53
    Regular Rod's Avatar
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    Quote Originally Posted by StoneNYC View Post
    There was a simple formula on a similar thread recently, now I can't remember... Bill, was it...

    ASA / filter factor # = new EI?

    Like 100 ASA with yellow filter (factor 2) is 100/2= EI 50?

    So 100/red (5) = EI 20?

    Is that right?
    Yes

    RR

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