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I've seen micro four thirds lenses listed with the term 'II'. See the below sample listings. What is this term called and why it is used?
Panasonic Lumix G 20mm f/1.7 II ASPH. Lens
Olympus M.Zuiko Digital ED 75-300mm f/4.8-6.7 II Lens
It means "2nd generation", or "2nd version". Cf. Canon's use of "Mk II" on camera bodies.
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