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I am new to this too, but not to digital photography. Someone a few posts back suggested that with a digital camera you could use "bulb" and take long exposures. You can't there is no such thing on a digital camera. 30 sec is the limit, not because of physical constraints (there are ways around that) but because of "amp noise" which in some cameras can get so bad as to make them unusable. CMOS cameras such as the Canon and very latest Nikon are better but you will still be stacking images and using dark frames etc to process a shot. Dedicated Astro cameras are cooled to make then quieter. DSLR are also physically large and this causes mounting problems as well. All very interesting if you want a challenging hobby but definitely not plug and play.
Roger
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