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This us a no-brainer ... Zuiko 12-40 PRO. Great multiple-purpose and weather-proof lens.
For strictly landscapes, the 12/2, 17/1.8, 7-14, 9-18 are all good. For portraits, the 45/1.8, 75/1.8 ... and the new 42.5/1.2 Nocticron!
What are the must buy lenses for the E-M1? I shoot weather, landscapes and some portraits.