Manual Flash Settings

Discussion in 'Beyond the Basics' started by LarissaPhotography, Jul 12, 2010.

  1. LarissaPhotography

    LarissaPhotography TPF Noob!

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    Recently we've changed from TTL flash to manual flash to experiment a little bit. A recent article in Professional Photographer magazine has me a little confused. There was a formula for how much power a flash requires based on distance and aperture. It doesn't seem like different flashes should behave the same at say 1/4 power. If you had a big flash at 1/4 power, isn't that different than a tiny flash at 1/4 power? Help me out guys!
     
  2. Josh66

    Josh66 Been spending a lot of time on here!

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  3. Garbz

    Garbz No longer a newbie, moving up!

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    Are you sure the intent of the article wasn't simply to describe the relationship between aperture, and distance? This is the same between various flashes.

    If flash A needs to be set at 1/2 at distance X, and at 1/8th at distance Y, then flash B will also need to drop the power by a factor of 4 between distance X and Y regardless of the power difference between them.
     

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