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<blockquote data-quote="J-see" data-source="post: 493088" data-attributes="member: 31330">I think you got this wrong. The problem with ISO is that it is a multiplication of the photon count which only affects the electron release and in that multiplies the inevitable photon noise. There's always noise since it is a part of the incoming signal and by adjusting the electron release, the incoming noise gets multiplied by the same factor. Any in-cam noise that creeps in during the count also is affected by that factor.ISO does not affect the incoming light and in that, increasing it does not lower that noise either.If the sensor collects 100 photons/electrons in a pixel, it would have 10 noise (square root of the collected signal). If I'd double the electron count using ISO, I'd end up having 20 noise while if I'd have been collecting the double of light without an ISO increase, I'd only have about 14.If you have to use ISO, it matters little since you can't do much about it but as long as you can increase the light intake by either shutter or aperture, that should be prioritised.</blockquote>

[QUOTE="J-see, post: 493088, member: 31330"] I think you got this wrong. The problem with ISO is that it is a multiplication of the photon count which only affects the electron release and in that multiplies the inevitable photon noise. There's always noise since it is a part of the incoming signal and by adjusting the electron release, the incoming noise gets multiplied by the same factor. Any in-cam noise that creeps in during the count also is affected by that factor. ISO does not affect the incoming light and in that, increasing it does not lower that noise either. If the sensor collects 100 photons/electrons in a pixel, it would have 10 noise (square root of the collected signal). If I'd double the electron count using ISO, I'd end up having 20 noise while if I'd have been collecting the double of light without an ISO increase, I'd only have about 14. If you have to use ISO, it matters little since you can't do much about it but as long as you can increase the light intake by either shutter or aperture, that should be prioritised. [/QUOTE]

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