D600 RAW is not much better than A900

Started Sep 27, 2012 | Discussions thread
Allan Olesen
Senior MemberPosts: 2,366
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Re: D600 RAW is not much better than A900
In reply to Michel J, Sep 28, 2012

Michel J wrote:

Reason why I suggested a dedicated sensor for low ISO here:
http://forums.dpreview.com/forums/read.asp?forum=1014&message=41972223

I am surprised that nobody in that thread explained to you that a large part of the noise in an image actually comes from the incoming light itself, not from the sensors or electronics. Nothing you do to improve the sensor can remove that part of the noise.

The reason is that at the small quantities of light which hit a sensor, the light cannot anymore be viewed as a homogenous, constant stream of light. It is a stream of single photons, arriving randomly. This randomness creates noise. At ISO 800,000, this noise will be gigantic because only a few photons will hit each sensor pixel.

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