A DSLR camera with a removable lens opens up lots of opportunities for astronomy projects.
Wide field lenses can be used to capture large portions of the night sky and the exposure controls available on these cameras allows you great deal of control of your image.
Adapters are available for all the major brands to convert your camera lens into an eyepiece barrel which can be slotted straight into your telescope. The camera now has an enormous lens!
The addition of a Remote Shutter Release cable, or Intervalometer allows you to take vibration-free long-exposure astrophotographs of distant objects that you can only glimpse with your eye.