Are there any "rules" for using ISO?

Started Apr 3, 2013 | Discussions thread
OP GreenMountainGirl Contributing Member • Posts: 684
Re: Are there any "rules" for using ISO?

nelsonal wrote:

Just so you know, going from f/5.6 to f/16 is reducing the aperture/exposure by 3 stops, the shutter speed adjustment was a 4th stop reduction, and your ISO increased brightness by a stop and a third so you're second photo was 2 and 2/3s less bright than the first.  Leaving the aperture at f/5.6 with the other two settings (1/500th and ISO 800 would have resulted in a second picture that was similarly bright as the first).

Nelsonal, I think you just precipitated an epiphany!  I do know about stops and halving/doubling light, but for some reason never thought about ISO the same way.  THANK YOU!!!  That fills in my mental blanks about the "Triangle".   This makes it easier to figure out what to do.


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