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Carl has it pretty well covered. I might add the 41 would be used mainly with solar or lunar imaging in mind. For planetary, the 21 is the one you want.
I have the colour one shot (DBK21) & it's a fantastic cam I reckon. I have the mono DMK21/filters/wheel as well, however in my mediocre seeing & very unpredictable weather, the DBK is better for me.
The only difference between the DBK & the DFK is the DFK has a factory fitted IR/UV cut filter whereas the DBK does not. I wanted to use my own filter so my choice was the DBK.
For DSO work, better off with a DSLR I think.
A quick pic of the DBK's capabilities.
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