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Why Shoot at ISO 100?

jbloom

Wethersfield, US
7735 posts

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"RE: Why Shoot at ISO 100?"

jbloom Gold Member Awarded for the continuous and generous sharing of his high level expertise and his always encouraging comments in several forums. Donor Ribbon awarded for his generous support to the Fundraising Campaign 2014 Nikonian since 15th Jul 2004
Sun 10-Aug-08 10:13 AM

I have to disagree. The amount of fill flash that is needed is not determined by any camera setting. Rather, it is a matter of the strength of the ambient light. Since by definition you are trying to "fill" the shadows of your subject, doing so depends on the amount of illumination of the non-shadowed part.

What is true is that you tend to need a low ISO for fill flash because your camera's sync speed (non-auto FP) limits how fast your shutter speed can be. "Sunny 16" says that at ISO 100 and 1/250, you need an aperture of about f/11 in bright sunlight. At ISO 200, it's more like f/16.

So, yes, you may want to shoot ISO 100 for fill flash, but it's not to give your flash greater distance. And for regular, non-fill, flash, it is a higher ISO that gives greater flash range.

-- Jon
Wethersfield, CT, USA
Connecticut High School Sports Photos

Visit my Nikonians gallery.

This is a hot, active topic! Why Shoot at ISO 100? [View all] , brad_nikon , Fri 08-Aug-08 05:50 PM
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