Olympus did a variety of extension tubes for the OM system and there are also third-party ones. I'm currently looking at a 25mm tube for use with the 50mm f1.4 lens. Since this is a very fast lens I'm thinking that even if I lose 2 stops I still have f2.8. The 50mm has a min focussing distance of 0.45 metres, if I add a 25mm extension tube what min focussing distance will I get?
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