The lens won't work on the M8 -- the flange is wrong, for some reason. I have one and I have tried it. For the price of the modification to the mount, you can probably get a rigid chrome Summicron, which is of the same era and which will work with the M8. The lens itself is one of my favorites, (very nice color rendition) but I have to use it on film M's, not digi-Ms.
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