Ok, good! I stand corrected. Will remove the post to save us some clutter. Thanks!Are you sure that the TS-lenses can take TC's? If I remember correctly extension tubes are ok, but not teleconverters.
100% certain. All Canon TS-E's take both 1.4 and 2x TC's.
Since it's still here (sort of), I'll add that the extenders are physically compatible, but the camera won't know they're there, so the aperture is reported incorrectly in the EXIF (not that it matters much).