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Question on the inverse square law
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<blockquote data-quote="kiwi86" data-source="post: 249200" data-attributes="member: 13164"><p>GN=aperture x flash to subject distances</p><p>or</p><p>aperture=GB / flash to subject distances</p><p>or</p><p>flash to subject distances=GN / aperture</p><p></p><p></p><p>If your GN is 90 (at 100 ISO) and flash to subject distances si 5 feet this mean, aperture is f/18.</p><p>If you use 200 ISO than GB is 90 x 1.4=126</p><p>400 ISO means GB x 2</p><p>800 ISO meaa GN x2.8</p><p></p><p></p><p>INVERSE SQUARE LAW</p><p>intensity=1/flash to subject distances 2</p><p></p><p></p><p><a href="http://www.youtube.com/watch?v=f5BIvSBjvLg" target="_blank">Digital Photography 1 on 1: Episode 59: Inverse Square Law: Adorama Photography TV - YouTube</a></p></blockquote><p></p>
[QUOTE="kiwi86, post: 249200, member: 13164"] GN=aperture x flash to subject distances or aperture=GB / flash to subject distances or flash to subject distances=GN / aperture If your GN is 90 (at 100 ISO) and flash to subject distances si 5 feet this mean, aperture is f/18. If you use 200 ISO than GB is 90 x 1.4=126 400 ISO means GB x 2 800 ISO meaa GN x2.8 INVERSE SQUARE LAW intensity=1/flash to subject distances 2 [url=http://www.youtube.com/watch?v=f5BIvSBjvLg]Digital Photography 1 on 1: Episode 59: Inverse Square Law: Adorama Photography TV - YouTube[/url] [/QUOTE]
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Question on the inverse square law
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