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Canon EOS RP RAW editing flexibility?

Started 3 weeks ago | Discussions thread
Quarkcharmed
Quarkcharmed Senior Member • Posts: 2,713
Re: Canon EOS RP RAW editing flexibility?
2

Fjzk wrote:

Quarkcharmed wrote:

danferrin wrote:

Sgt_Strider wrote:

I have to admit, I'm still confused with the ISO-invariant terminology.

With a sensor that is ISO-invariant, you can shoot at ISO 100

ISO 100 is a bad example. Most of the modern cameras (Canon, Nikon, Sony, Fuji) are ISO-invariant from about ISO 640-800.

Above I've posted a link to Photonstophotos chart where you can check ISO invariance range for your camera.

So the RP, per that chart, is ISO invariant at base ISO and then from 300-400 onwards it is better to just raise the ISO versus underexposing and recovering in post? Am I reading this right?

Per that chart, the RP is nowhere ISO-invariant for practical use.

You can see flat groups like ISO 100-120*, then 160-200-250 etc. - that's because the camera uses digital gain (multiplication) between those ISO values, which is the same as digital 'exposure' slider in a raw photo editor. But it's not practical to use ISO-invariance within such short ranges covering less than a stop. You might as well make the camera use 1-stop increments for ISO, instead of default 1/3-stop increments.

* ISO 50 is marked as extended ISO in that chart (and in the camera manual) - in practice that means the raw data at ISO will be the same as ISO 100, just different ISO tag and middle grey point. So ISO 50 doesn't really help invariance.

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