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Why are people so desperate to cool their cameras as cold as possible? Have you actually compared an image of a camera cooled to -30 and cooled to -10? There is VERY LITTLE difference in the amount of noise reduction. If you are trying to detect extremely faint Sn or Asteroids at very low SNR then maybe it's worth the effort. Are you trying to detect really faint galaxies or stars? In the end seeing is going to imapact all of this more than CCD Temperature.
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