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  1. #1

    Join Date
    May 2012
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    ND Calculation Help - ISO 3 & Flash

    Dear LF world -

    Quick question, would just like some help to confirm the below..

    Project-
    Shooting 8x10 Paper Negs Portraits, 600mm f9 @ ISO 3, with Flash.

    However, would like to preview on digital before hand, WITHOUT altering flash strength.

    At ISO 100 on the digital, I think I require a 5 Stop ND filter to make it the equivalent of ISO 3?
    Is that correct??

    Then lets say, due to bellows compensation factor, I need an extra stop exposure, I would then need an extra ND stop? Making the equiv ISO 1.6?

    Any comments would be much appreciated!

    Thanks!
    Matt

  2. #2

    Join Date
    Mar 2005
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    Count on your fingers. 100, 50, 25, 12.5, 6.25, 3.125, 1.5626, ... 0, -1, -2, -3, -4, -5, -6

  3. #3
    RalphLambrecht's Avatar
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    Sep 2003
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    Central florida,USA
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    5 stops from ISO100 to ISO3(100 50 25 12.5 6 3)is confirmed.
    Regards

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



 

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