http://cgi.ebay.co.uk/Macro-Extensio...d=p3286.c0.m14
just over £5 is one option, if you dont mind the totally manual route.......expect to pay quite a lot more for auto tubes with contact necessary for your 50mm to body communication.
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primarily using Nikon film and digi kit, and some micro 4/3rds gear for experimenting with old lenses
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