Re: dynamic range and thermal noise
- From: Scott W <biphoto@xxxxxxxxxxx>
- Date: Sun, 07 Oct 2007 03:38:23 -1000
Marc Wossner wrote:
dear ng,
I´m still into analog photography but have a keen interest in the
digital technique. As far as I understand it, the dynamic range of an
imaging sensor/camera combo is defined as the maximum signal divided
by the noise which is produced in the various stages. Does thermal
noise still play a vital role in this calculation (as far as longtime
exposures are concerned) or is it so successfully erased by the noise
reduction techniques that it doesn´t have to be be taken into account
in calculating dynamic range?
Best regards for your input!
Marc Wossner
I believe you are really talking about dark current, which is very temperature depended, not thermal noise. If so then yes for long exposures dark current can become an issue.
Scott
.
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