The Inverse Square Law Photography Cheat Sheet

My test and finding about the inverse square law - It's a law as long as you set your strobe right.


UPDATE: Some great discussion going on on the main blog. Main points of it posted here, the full comments are on the original post.

  • Kris Grimes PRO 6y

    Great experiment. Thanks for sharing the results.
  • Camilo Pedroso 6y

  • Tim Rogan PRO 6y

    I might be misunderstanding you. I did one of these with just a flash, only I used a light meter about a foot away from the wall to measure the actual light and not the pattern on the wall. I think doing that here would give you a more accurate representation because the light traveling straight down about a foot away from the wall is different than the light traveling down the wall itself. When I could hardly see anything on the back wall it was still lighting up the end wall in my case (see how bright the end wall is in the top picture).

    Lighting Diagram 2 by Tim Rogan (formerly caprae)

    Lighting Diagram by Tim Rogan (formerly caprae)
  • Randi Scott PRO 6y

    Nicely done article
  • Udi Tirosh 6y

    caprae Thanks Tim, WEll >blush< I think your experiment went better :)
    I wonder if you see any difference when setting the flash to differnt zoom levels / using modifiers.
  • Tim Rogan PRO 6y

    I hate to say it but you really have me interested in doing just that. I'll see if I can do that over the next week or so. I've got umbrellas, home made beauty dishes and a soft box. At the very least you demonstrate well the different lighting patterns they put out.
  • Udi Tirosh 6y

    caprae :) it;s the strobist bug :) looking forward to see the results.
  • Rodrigo Alvarez-Icaza 6y

    Absolutely stunning work!!! Have a good weekend my friend!
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Taken on September 29, 2009
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