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The neat thing about the reverse mate is that is has a ring that goes on the
bayonet side of the lens when rerversed and stops down the aperture for you.
Without this how can you stop down a reversed lens?
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it's a problem with OM mount. Nikon and Minolta manual focus lenses solve
this problem by having the "resting" state of the aperture when it is
not mounted be closed. when the lens is mounted, a little lever holds
the aperture open, and when a pic is taken, releases it to go back closed.
thus, you won't get an auto-diapragm with one of these lenses, but you
don't need anything special to reverse them.
at the other end of hte spectrum are EOS and Maxxum with electrical
contacts to stop down the lens. just a simple thing like inspecting
the aperture blades for oil leaks, as one would want to do when purchasing
a used lens, is a non-trivial operation.
Joseph
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