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DSO and planetary generally require different functionality in a camera so it is not easy to get one that does well in both areas. Yes you can get modded webcams like the ToUcam that you can take DSOs with but it will never compete equally with a camera designed for DSOs. Similarly you can take planetary and luna images with some CCD Cameras that have short enough exposures, but they generally have image download times that restrict their usefulness where as webcam style cameras can stream up to 60 frames per sec.
My suggestion is, if you really want to go this way, get yourself a good webcam (ToUcam, DMK or similar) and start with the planets and the moon. When you decide to move onto DSOs you can purchase something like an ATiK cooled colour camera for your DSOs or a second hand DSLR and use the webcam for auto guiding.
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