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I just picked up a DMK 41 to replace the 21 for guiding purposes. I wanted the larger chip area, as I was having a hard time finding a guide star when using my LX200 as the guide scope, due to too much focal length :p
If I get a chance, I'll point it at a nebula tonight and see how it does, however the fact that it is 8 bit is going to seriously limit its utility on nebulous objects, as it will end up with graduations. It would likely work just fine for stuff like supernova and minor planet searches, though.
The lowest in-stock price that I could find in Australia was $900.
Pixel size is 4.65μm, vs 5.6μm on the 21.
QE is around 40% from the sensor, which is OK, but far from what you can get out of more expensive chips.
Regards,
Eric
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