T-adapter without unnecessary wide part?

My local telescope store says that you can't put a camera with a T-mount
on most reflector telescopes because "you can't get the camera close
enough." Well, take a look at a typical T-adapter for a 1.25 eyepiece
tube:

http://www.telescopes.com/telescope-...sal114inch.cfm

It has a thick portion designed to keep the camera about an inch
further away from the telescope than it would otherwise be. It seems
to me that this is a problem easily solved, if someone made a T-
adapter without the thick portion. Is there a reason for this?
What am I missing?

I know I could put a camera on a Cassegrain telescope, but the Newtonians
have much lower f-numbers.


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