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Question for those that might have tried it: If you were to used it with an extension tube on a FF body, how's the frame coverage?
I would guess the tube helps the mirror "clear" the EF-S portion of the equation, but how are the corners? Is the image projected from far enough to cover FF?
Sorry that I'm just now responding to your question -had to reload my PC. Here's a shot with the EF-S 60mm with a 12mm tube taken with a 1.3x crop camera (Canon 1D MKIII):
There won't be any coverage issues with using it on a full frame camera -the lens actually projects a large image circle on the 1.6x crop bodies.