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I have a TEC180FL. I use a FLI Proline 16803 and the TEC field flattener. Basically there is plenty of room for focus there for that setup.
I take it you are not able to rack the focuser out enough to get to focus rather than rack it in?
In which case you need an extension tube to place the camera further out. You wouldn't put a DSLR on a diagonal
usually as it would throw the balance of the scope off and open the door for flexure.
There are plenty of extension tubes on the market. I'd try scopestuff.com. or one of the vendors on Astromart for DSLR accessories.
You can also post this question on the TEC Yahoo Group there are plenty who use DSLRs with TEC140's there.
Beautiful scope you've got there by the way.
Greg.
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