f-number equivalent between m43 and FF

Started Mar 25, 2014 | Discussions thread
olliess Senior Member • Posts: 1,349
Re: f-number equivalent between m43 and FF

D Cox wrote:

The signal in a photographic image is the differences between pixels. The uncertainty (error bars) for each pixel gives a random, or noise, component when comparing the pixels.

I thought we went through all this a few weeks (months?) ago. Defining the "signal" in an image to be the "differences between pixels" is deeply problematic.

The total area of the sensor is irrelevant. If you put the same lens on various sizes of sensor, the noise level in the part of the image that they all record will be identical. (Assuming they are the same generation of technology.)

If you compare ("view") all the capture images at the same size then of course it's relevant.

Sure, if you want to compare the output from a tiny phone sensor at its "true" (captured) size against the output from a MF sensor, then the phone sensor will probably be better. You'll have a very high quality, very tiny image, but comparing images this way for photographic purposes is kind of silly.

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