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Bumping this thread back up - possibly belongs in terms of my question in the astro-photography equipment section.
Over the last 12 months have used the S/N ratio graphs that Richard shared here to get the best results with my Canon 400D.
Now my camera is in the process of getting TEC cooled, and I am wondering what the new S/N ratio numbers will be? It will go 15 degrees below ambient so in winter this means well below zero.
So the question becomes, has anyone done some S/N ratio tests with a cooled DSLR that's close to the 400D sensor or an older model perhaps that they can share?
One of the things I am hoping with my modified and cooled to be DSLR, is to have better results with something like 10 minute exposures of faint galaxies where I think the non-cooled DSLR CCD's let things down.
Any info that people can share would be great.
John K.
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