I have used the DMK21AU04 as well. Very nice Camera. I am currently using the DMK21AU618 which has a much better sensor in the DMK family lineup. Both are MONO and the difference is huge compared to COLOR. 640x480 is actually high resolution imaging. Remember planets are really tiny compared to DSOs. Large sensors will render a smaller image and Planetary is all about focal length and scale. The big names in Planetary Imaging like Damian Peach, Don Parker, Chris Go and Anthony Wesley use a Flea3 camera from Point Grey considered to be the best camera around. You would need to check though if they already sell the USB model. Last I checked the camera was a Firewire. If the investment is based on a priority meaning you don't justify paying a FLEA3 since your main activity is DSOs, you might be very happy with the DMKs. If you want the best of the best maybe the Flea3 is the way to go and computing requirements might become more demanding. Now always keep in mind, Seeing is king. The best camera will not make any difference with bad seeing.
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