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Markus,
Don't know about the 16 bit....
There is another couple of terms which are not included in our simplified SNR calculation...one of which addresses the digitization noise within the a/d converter:
G^2 * Rhof^2
where G is the gain (e/ADU) and Rhof an estimate of the 1 sigma error (Howell gives an approx value of 0.289)
All other numbers are in electrons/ photons. (ADU * Gain)
In a worked example Howell shows the SNR using the shot noise v's using the full SNR equation.
This gave for shot noise SNR=346 and the full equation SNR=342 - less than a 1% difference.....Not worth the effort??????
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