I use a DMK21 for lunar imaging. It's superior for that use to the Toucam/SPC900 because you can run it at higher fps and being a B&W camera it has a higher effective resolution than a colour cam like the SPC of the same pixel dimensions. Apparently it also has less noise.
All that said, the SPC900 is much cheaper and a very good introduction to planetary webcamming, since it is colour you can use it on the planets without filters. It,s what I used till I switched to the DMK.
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