Jeff Lear , Dec 05, 2008; 05:26 p.m.
Typically, in order to adapt an SLR or dSLR camera to a telescope (or spotting scope) you require a "T" adapter which will thread onto the visual back of the scope, then you need a threaded bayonet ring specific to your camera that will thread mount to the back of the "T" ring.
I did some research and it looks like Bushnell/Bausch and Lomb does not make a camera body adapter for the Canon EF lenses (although they do for the old Canon FD lenses). However, the threaded back of the T ring appears to be a standard thread that will fit camera body adapters from Celestron and Meade. I would confirm this before you plunk down your $15.00.
Here are some links that might help you out: