The more extension you use the more light you lose, I think that with a 50mm lens and 50mm tube which would give 1:1 you will lose a couple of stops. Obviously you lose some quality in that the, say, 50mm lens is not designed to work primarily that way but the quality is still excellent and no worry. Light is the main thing but no problem with static subjects and a tripod, as a cheap alternative to a pucker macro lens it is excellent and I would go for it. Indeed even if you got a proper macro lens one day they can be used with that too to give even closer focussing. I bought the Kenko automatic tubes to work with my Canon lenses but I know nothing of the availability of the old Olympus mount.
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