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Originally Posted by andybarton
I bought mine for my M2 a couple of years ago - it's a metal ring, with no rubber in sight...
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Andy, that must have been a VERY old one. I have two, one fairly new, the other one years old, and they both have a rubber ring surrounding the correction lens. Comes handy if you screw it onto, say, a M3, as you will then be less prone to scratch your sunglasses.
Andy