Nope, haven't tried this...
But (yes, this is gonna sound REALLY weird) I have shot through the lens and viewfinder of an SLR in reverse. What I did was to attach the lens with the biggest aperture that I could find (50mm 1.8) onto an old film slr (EOS 888) and then put the subject behind the viewfinder of the 888. I then positioned my XT with kit lens to point directly at the 50 such that the two front elements were touching together. Then I took the picture using the XT.
Sorry for hijacking the thread!
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Canon 350D, 18-55mm 3.5-5.6, 50mm 1.8, 100mm 2.8 Macro, 75-300mm 4-5.6, Sigma 10-20mm 4-5.6
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A picture is a frozen slice of time painted on paper.
OK to edit and repost my shots on DPS