ISOless sensors, read noise and photography - many questions!

Started Oct 3, 2013 | Discussions thread
bobn2 Forum Pro • Posts: 59,122
Re: full circle: "just raise ISO, when necessary!"

boardsy wrote:

Steen Bay wrote:

bobn2 wrote:

boardsy wrote:


- no visible benefit in keeping ISO at the low read noise minimum (800 for this sensor), and possibly struggling with a dim view/LCD in camera, and raising brightness later.

I'd be very interested if bobn2, Great Bustard, Gollywop, Detail Man et al would agree?

It depends on the scene. If the scene has a higher tonal range than can be handled by the 'correct' ISO, then there is advantage to using the lower ISO.

Could be argued that the ISO isn't 'correct' if important highlights are blown. Then the 'correct' ISO would be a lower ISO where the highlights are protected.

@ bobn2 - yes, that's been mentioned already, and part of what I assumed by "when necessary" - so raise ISO as required for a bright image with protected highlights (if they're a priority for the shot - better-exposed shadows could be more important). But aside from protecting highlights it seems here's no other benefit to keeping it low and raising brightness in RAW later.

That's another 'it depends'. It depends on how you 'raise brightness in raw' and how the camera does it. On a computer, potentially you can do it with high quality extended word or floating point arithmetic which at least in theory could produce better results than the 16bit integer arithmetic commonly applied in image processing pipeline hardware. That of course doesn't mean that any particular raw processing program is guaranteed to perform better than any particular camera.

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