ISOless sensors, read noise and photography - many questions!

Started Oct 3, 2013 | Discussions thread
RussellInCincinnati Veteran Member • Posts: 3,201
nice example of Nex 3 noise differences. Also which one is which?

EinsteinsGhost wrote: Russell, These images are not a good candidate to see banding since you're not really lifting any shadows...In fact, 12,800 appears to have a slight edge...Here're a couple from NEX-3:

50mm, f/2, 1/320s, ISO 12,800

50mm, f/2, 1/320s, ISO 800, +4EV

Banding starts to show in the left side of the frame (and there is also more chroma noise on the dark patterns themselves, which is also due to banding). And that is without having to lift the shadows completely (which begins to show distinct lines).

Yes, the increased chroma noise is visible as you conveniently point out in this example of a photo with lots of featureless area. And it's excellent and useful to be aware of these differences.

As a dirt-ordinary practical matter, in for example typical Nex C3 portraiture, I don't see enough difference to be keep me from saving the trouble of moving an ISO control from 800 to 12800 in the field, or worrying about tiresome exposure bracketing to preserve highlight detail. Which one is which below, in-camera iso 800 or iso 12800?

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