Sensor size versus highest usable ISO

Started Jun 15, 2014 | Questions thread
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Sensor size versus highest usable ISO
Jun 15, 2014

It can be seen that increasing the size of a sensor for the same number of pixels and the same era of technology, allows the use of higher ISO due to the reduction of noise.

My question is, can that be quantified, and what is the value.

For example, it appears that a 1" sensor (16mm diag) is about 4 times the area of a 1/2.3 sensor (7mm diag), does this equate to two stops, or two steps higher in ISO.  So if I could use ISO1600 on the 1/2.3, could I reliably say that I could use ISO6400 on the 1" sensor for a similair amount of noise.


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