Why bother changing base ISO?

Started Jul 18, 2007 | Discussions thread
kevm14 Senior Member • Posts: 2,253
Re: Why bother changing base ISO?

Muntz wrote:

True, except that if you bump the iso the image is not properly exposed.

Yeah but the sensor doesn't really have a concept of properly exposed. I think people think that exposing to the right means you're filling the photosites to full well capacity with photons. The "right" is just a histogram calculated from a final image.

Say 1/500th, f/5.6 and ISO800 creates a JPEG that is exposed to the right on the histogram. This will take X many photons, average, per photosite, and X

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