The Panasonic Lumix G Vario 45-200mm f/4-5.6 OIS is a solid performer although it has its weaknesses. The resolution is pretty good throughout the range. The vignetting figures aren't overly impressive at max.

... to round out a system. Since I had sold my large clunky Canon DSLRs and gone mirrorless with the Panasonic Lumix GX7 this was an obvious choice. Since the micro four thirds system has 2X crop ratio, this becomes in effect a 90-400mm lens. Light, small and sharp. Definitely a good value.

It's a good choice for telephoto zoom with autofocus on micro 4/3rds right now. The Olympus 40–150 doesn't zoom in quite as far, but it starts wider – wide enough that it's better suited for portraits and won't need to be swapped out as often.

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  Stabilization built into the lens - more effective than IBIS at higher telephoto lengths. Better sharpness than the average kit zoom. Small...very small. 90-400mm zoom range is slightly longer than the average kit telephoto zoom.

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  90mm equivalent zoom starting length is long enough that you will have to switch back to a standard zoom often. Some people don't like that the manual focus ring is electric rather than mechanically linked... There are good and bad things about that.