Hi!

I've got a Rebel 7 I'm using as a primary camera and have a few lenses spanning the range from 11 to 300.  

Now it just so happens I have a telescope as well and have a 2.5x Barlow lens for it as well as a bunch of other lenses for it.

Is there a way to attach one of these lenses to the Rebel?  If we can stick the Barlow on top of the 300 we get 750...