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Thread: ISO question

  1. #1
    Badcast's Avatar
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    Feb 2011
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    St. Clair Missouri
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    Randy

    ISO question

    I read on a post not to use the inbetween ISO settings like 250 500 is there a reason for this or is this not correct.

    Randy

  2. #2
    Steaphany's Avatar
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    Apr 2009
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    Steaphany

    Re: ISO question

    The only reason I would see for avoiding the in between ISO settings is it complicates the math.

    If you have the ISO set to 200 and the meter yields a combination of f/8 aperture at a 1/200th shutter, you can alter the ISO to 400 and then it's a simple selection of f/8 aperture at 1/400th shutter or f/11 aperture at 1/200th to have the same exposure.

    Now if you set the ISO to 250 or 500, you no longer have an obvious relationship to maintain the exposure.

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