Exposure basics, lesson two point one (& ISO)

Started Mar 19, 2013 | Discussions thread
Ulric
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Re: It's about useful comparisons - not which is better
In reply to Jack Hogan, Mar 20, 2013

This was the example that brought this discussion to this point, on the effect that inconsistent ISO labelling across cameras and manufacturers can have on a naive evaluation of the SNR performance of two cameras :

Noise performance when both cameras are set to the same in-camera ISO = 3200

Noise performance when both camera's ISO dials are set so that they will produce the same mean raw value for the same signal*

My original opinion , which I continue to hold, is that it appears to me that the more useful of the two is the bottom one, but that most people would not know it. In fact my sole mentioning it four threads ago has resulted in flaming that is still ongoing.

The usefulness depends on the exposure being the same, which I don't think it is. Do you?

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