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Imaging Source cameras (like the DMK/DBK/DFK etc) are great for taking piccies of the planets and the Moon, but aren't so hot for DSO's. Why do you want to by the camera with firewire?? If you have USB, you'd be much better off buying the USB version of the camera. The DFK 41 might be good for a film telecine rig, but if you're going to get one for astropics, you're much better off with a DMK 21 mono and a filter wheel. For planets and such, you want a camera that has a fast frame rate and good resolution. The DMK 21 is the best bet here....upto 60fps and 640x480 resolution. The fast frame rate will help you to "freeze" any unsatisfactory atm' conditions like tube currents, turbulent air etc, so you can get good frames to stack.
However, if you want to take piccies of DSO's as well, you'd be better off using a DSLR or buying a dedicated CCD camera.
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