How to properly compare RX-100 and NEX-6 kit high ISO noise?

Started Apr 29, 2013 | Discussions thread
Erik Magnuson
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Re: How to properly compare RX-100 and NEX-6 kit high ISO noise?
In reply to captura, Apr 30, 2013

captura wrote:

Erik Magnuson wrote:

captura wrote:

Some irrefutable law of physics should allow that the smaller sensored camera, in this case the RX-100, will have more pixel density, therefore much smaller pixels and resulting higher noise.

Nope, that's not the laws of physics.  Pixel size has little relation to noise - total sensor size and pixel efficiency (q3, fill factor, color filter loss) matters more.  For example, the NEX7 has smaller pixels than the NEX5 and also has lower read noise.  (See http://www.sensorgen.info/)

For the same reason, an APS-C sensor should outperform an m43, and a FF outperform an APS-C, all things being equal.

In the case of the RX-100, all else is not equal.  It has a very efficient sensor.

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Erik

I disagree.

- borrowed from clarkvision.com

His data and/or analysis is obsolete.  The measurements from modern sensors do not match his theory.  If you want another opinion, try http://theory.uchicago.edu/~ejm/pix/20d/tests/noise/noise-p3.html

"It was shown that for fixed sensor format, the light collection efficiency per unit area is essentially independent of pixel size, over a huge range of pixel sizes from 2 microns to over 8 microns, and is therefore independent of the number of megapixels."

This has been discussed many times on this site, mainly in  Open Talk, e.g. http://www.dpreview.com/forums/post/51322621

There are two main sources of noise: read noise and shot noise.  Shot noise is a principle of light and so dependent on sensor area and independent of the pixels.  Read noise depends on pixel design and can be measured as shown on the sensorgen.info site.   The data there is clear and newer than what Dr. Clark uses.

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Erik

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