The advantage of this is a relatively low price, but of course the CCD still need to perform to appeal to astro imagers,
Having said that, it's certainly more robust in design than unattractive, typified by its large and clunky looking cooling fan. The QHY9S is in many ways firmly in the function over form category. We'd definitely recommend this to deep-sky imagers making the leap from DSLR to cooled CCD. It worked straight out of the box with minimal setup and we were imaging before we knew it. The small size also means your 1.25-inch filters will be perfectly suitable for this CCD, making the move to full astro-CCD camera a little easier on the purse strings. This is the area with fewest optical distortions, so correction is often not required. Also, b ecause the field of view is quite small, only the central portion of the light cone is intercepted. Testing the camera out, we were very pleased with its capability in collecting photons without too much thermal noise.
Nonetheless, what the chip may lack in size, it certainly makes up for in terms of its sensitivity. The CCD sensor in the Atik 414EX is pretty small with an 11mm diagonal, and on a refractor with a focal length of 509mm it produces a field of view of 1º by 0.75º.
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