ISO Invariance and Exposure Strategy

Started 11 months ago | Discussions thread
PhotoPhart Senior Member • Posts: 2,129
Re: Would anyone care to summarize?

Twitchly wrote:

Bill Ferris wrote:

Twitchly wrote:

Since I rashly continue to drive and take pictures anyway (though not at the same time), any layman’s advice would be welcome.

In layperson's terms, I think of ISO as an image processing tool. Scene brightness, shutter speed and f-stop determine exposure. ISO allows us to set the lightness of a photograph - or at least part of the photograph - to our liking in-camera. The degree to which a camera is or is not ISO invariant guides how we approach achieving the final lightness of the whole image. Working with an ISO invariant camera, we can be confident of being able to process a single RAW exposure. Working with a camera that is not ISO invariant, we may be better-served by blending exposures, or by using filters or artificial light to manage the dynamic range of the scene so that a single exposure allows us to achieve near-optimal lightness across most of the resulting image.

Thanks. I think I see a glimmer of light.

This article helped, too:

I’m going to do as that article suggests and experiment to see how “ISO invariant” my Nikon and Canon are.

Interesting that the phrase was coined here on this site, which explains why I’m not seeing it much elsewhere.

That's a better webpage than this one, where mr Bailey has to sideswipe the whole DPReview website

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