New Technology used for sensor fabrication.

Started May 31, 2013 | Discussions thread
Eric Fossum
Contributing MemberPosts: 819
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Re: New Technology used for sensor fabrication.
In reply to John Sheehy, Jun 1, 2013

John Sheehy wrote:

Read noise is extremely high, even on the best sensors.

well, it is all relative.  If you want to do photoelectron counting, I mean really count the electrons, then you are correct.

You need about 0.15 e- read noise at the pixel level, and high analog gain (at least several ADU to each electron), to simulate pure photon noise, by condensing a histogram of separate spikes into a clean histogram with integer electron counts.  Currently the best DSLR sensors have about 10x that much read noise, and the best P&S sensors about 6x that.  If you don't re-construct the histogram, 0.15 e- read noise is quite visible in very weak exposures.

I am not sure you meant that very last part.

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