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  1. #71

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    That is a good explanation, Michael.
    I am not doing macro but yesterday I made a graph based on my earler post.
    The vertical scale is 'relative EV" to indicate change in camera settings for example f/ (by taking log-base2 of the change in luminance [cd/m^2]
    Graph is for a 65mm long flash tube.
    It also shows that after the distance is further than 2~ 3 times the length of the flash tube, the Gauss Law (inverse square)
    is quite accurate.
    Closer than that, the EV settings do not change so much.
    Attached Thumbnails Attached Thumbnails FlashClose.jpg  

  2. #72
    michaelbsc's Avatar
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    Quote Originally Posted by wombat2go View Post
    That is a good explanation, Michael.
    I am not doing macro but yesterday I made a graph based on my earler post.
    American taxpayer money at work. I spent almost 24 months in technical schools in the US Navy learning that, plus a million other things.
    Michael Batchelor
    Industrial Informatics, Inc.
    www.industrialinformatics.com

    The camera catches light. The photographer catches life.

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