f-number equivalent between m43 and FF

Started Mar 25, 2014 | Discussions thread
Great Bustard Forum Pro • Posts: 40,691
Still not correct.

D Cox wrote:

Great Bustard wrote:

How does a pixel know how big the sensor is ?

It doesn't. It's also not relevant, except inasmuch as the pixel count affects sensor efficiency. For example, if we had two sensors, one with 12 MP and the other with 24 MP with the same size and same QE, then if the read noise per pixel were the same for each sensor, the 24 MP sensor would be more noisy (although this would only be apparent in very low light).

Exactly. And it would be more noisy because the pixels are smaller.

It would not be more noisy because the pixels were smaller, but because there were more of them, and, in the example I gave, the read noise per pixel was the same (if the read noise per pixel scaled with the pixel pitch, then the noise would be the same).

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