Increasing ISo decreasing Aperture.

Started Oct 5, 2012 | Discussions thread
Tino27
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Re: Increasing ISo decreasing Aperture.
In reply to k00707392, Oct 5, 2012

The difference between the f/2.0 and f/3.5 is 1 2/3 stops. Thus, your ISO would also have to open up by 1 2/3 stops, so it would go from 100 to 320. BTW, as far as I know, if your camera is measuring in 1/3 stop increments (some cameras do give you the option for 1/2 stop increments), there would be no ISO 600. The closest would be ISO 640.

You should note, however, that the DOF (depth of field) you can achieve at f/2.0 will be significantly different than the one at f/3.5. At f/2.0, the DOF will be exceptionally narrow. That being said, f/2.0 ISO 100 Speed 100 will get you the same amount of light as f/3.5 ISO 320 Speed 100.

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