Battery power. You would be carrying a strap on battery to provide
enough power to keep a CCD cool enough to make any difference. Most
cameras use a second exposure to establish a noise pattern in critical
long exposures and then subtract it from the image. I have seen some
long exposures on some cameras with and without noise reduction and
some of them do have hot components that contribute to an uneven noise
production. Fortunately the noise reduction via dark slide eliminated
it.
Winsor
Long Beach, CA
USA
On Oct 18, 2004, at 5:58 AM, BILL CLARK wrote:
> That got me thinking as to why digital cameras and their sensor chips
> aren't themoelectrically cooled. Surely this would reduce the noise
> seen
> in many digital images, it does on astronomical CCDs. OK they are quite
> cool and sometimes quite large but surely it is possible to cool a
> digital camera sensor in a similar way? Are there any digital cameras
> which do this?
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