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Hi,
The QHY8 is cooled but it is not regulated cooling. Once you turn on the cooling the camera will get as cold as possible but it will vary with ambient. Therefore like a DSLR you probably need to take darks as part of the nights imaging, unlike a regulated setup where you dial in the temp and can take the darks anytime. People say you dont need to take darks with a QHY8 but i dont quite understand this as there are other types of noise apart from just hot pixels.
Additionally the cost of a 40D plus mod plus cooling is more expensive than a QHY8 and in some cases is approaching that of dedicated second hand astro cameras SBIG etc. I would probably go the dedicated astro camera route if it was my choice and get the QHY8 even though the cooling is not regulated.
If you are talking about spending over 3 grand landed on a modded, cooled 40D which wont be any use for daylight the lighter dedicated QHY8 starts to look much more appealing.
Just my 2 cents
Paul
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