Hi Matthew
To attach the DSLR you will need a T ring and a camera adapter. You will slot this into your telescopes 2 inch focuser. This configuration is called having your camera at prime focus.
No you wont need a lens for astro photography, if you do want to image planets you will need a Barlow or a power mate. These attachments magnify the object in the view by a factor of 2 x 3x 5x.
Thought for planetary photography small webcams are preferred choice as the video can be broken down to hundreds or thousands of frames which are then sorted out and stacked for a final image.
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