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Old 18-09-2013, 05:42 PM
rally
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Join Date: Sep 2007
Location: Australia
Posts: 896
Alistair,

Delta 40C gets rid of 99.2% of the original dark noise at ambient
Delta 50C gets rid of 99.7% of the original dark noise at ambient

Its really a trivial difference, to get carried away by it !

Is this important to you ?
Do you have all the other sources of noise under control to this extent ?
Can you be assured that all your subs are within that degree of perfect focus, what about your guiding and tracking accuracy, what about collimation and coma or tilt etc . . .

Camera integration and other features will far outweigh that last 0.5% of dark noise.

From a Dark's management perspective its easier if you hold a consistent temperature across the seasons (or maybe just two) rather than going for maximum possible cooling - because you will then need to create, manage and maintain multiple Dark's libraries
So that usually means not running the camera at 100% of cooling capacity in any event - but something that works in Summer and winter and probably never exceeds maybe 90-95% on the hottest of nights.

As stated, better to have accurate and consistent Darks than necessarily the coldest possible camera.
If you are really worried about this, then you need to upgrade to the next class (or three) of equipment !!!
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