What's the Difference between the Olympus 14-42mm Lenses?

There have been three different iterations of the 14-42mm kit lens:

  • Original
  • II: This revision added a bayonet that supports add-on converters at the front of the lens
  • IIR: This revision hides the bayonet with a removable ring and reportedly also has a faster AF motor, which helps with the third-generation Olympus autofocus system (e.g. E-P3, E-PL3, E-PM1)

Optically they all appear to be identical in performance (other than focus). 

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