You should be able to attach a DSLR to a telescope quite easily - most telescope manufacturers make adapters for this though depending on brand the price of them can vary greatly (from £40-£500)! Being honest though the only thing you will acheive decent photos of in this way is the moon and that it probably easier to shoot with a longish lens (as you will have to use manual focus when shooting through a scope). Everything else out in the sky is just so far away that even if you manage to acheive focus it will still just be a speck of light on a dark image. I did attempt to take a photo of Jupiter and the Galilean moons but the hugh focal length needed and the lack of light (hence slow shutter speed) left me unable to overcome the problems of shake.
If you are keen on astro photography then a decicated camera eyepeice is the best way to go (effectively an eyepeice with a senser chip in it). The amazing shots that you see on the web tend to be composites of hundreds (if not thousands) of images taken with one of these cameras and then merged into a single shot using a specific bit of software.
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