Just had a chat with a friend and I mentioned my 800-400mm zoom.
Of course, it was a sort of Spoonerism and I meant to say 80-400mm, but it led us into postulating just what such a zoom range could do. Perhaps make things look further away? 
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Could be handy if you’ve not got your reading glasses to hand and your arms aren’t long enough…
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That’s no good. It’s the wrong way round. Mine starts at at 800mm and then goes all the way up to 400 
Perhaps you mean negative mm? 
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By the strictest definition, it would still offer the same capabilities of a 400-800 zoom, but it would be like driving on the wrong side of the road.
Ah, but what if you put it on back to front? 
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They’re called selfies.
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As a result of relocation, I have learned to drive “on the wrong side of the road”. I dare say @Joanna has, too. I still have to listen to the BBC in English when I visit to UK to remind myself that motoring sanity has been restored.
I am more concerned, to the original question, about the re-engineering of the mount that one would need to fit the lens (even in all manual!) onto the body backwards.
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Joanna, you saved my life. I had always wondered why I had to reduce the size of the photos to achieve a wider angle of view.
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