Is FF sensors going to slowly phase out?

Started Apr 11, 2013 | Discussions thread
tomtom50
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Re: it depends on your definition of 'slow'
In reply to EinsteinsGhost, Apr 15, 2013

EinsteinsGhost wrote:

forpetessake wrote:The f-stop determines the brightness, but you need to integrate over the area to get the total light, collected by the lens, and that's exactly what determines the photon noise part of S/N ratio.

Nope. Larger sensor uses more light (for a wider FOV), but the light falling on the sensor over the same surface area as a smaller sensor doesn't change.

I think you are talking past each other. forpetessake is speaking of brightness in the sensor of lux, lumens/area. It is correct that lenses of equal aperture deliver the same lux, and since lux is lumens per unit area more area means more lumens.

This is a main reason a larger sensor tends to outperform a smaller (I wrote tends, many exceptions exist) sensor. Photon shot noise is related to the number of photons falling on the entire sensor for a given output scale.

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