a sensor has an intrinsic SNR. the output SNR depends on input SNR, the gain, and the noise in the amplifier. the gain in a DSLR is a function of the ISO setting. if the amplifier is perfect, then the input SNR is identical to the output. if it's not, it's less. increase the gain and the SNR decreases because the amplifier isn't perfect and because the output is clipped.
Herb... ----- Original Message ----- From: "J. C. O'Connell" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Saturday, November 06, 2004 12:07 PM Subject: RE: USAF target and resolution tests > Youre still not clear, what is the "theorethical maximum SNR of a > DSLR/SCANNER at lowest ISO" mean according to you? > Use said "theoretical" which usually does involve mathematics and > abstraction and is exactly what you were comparing the real hardware > against!
