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It's intended for the Micro 4/3 mount and produces a short telephoto field of view with a very wide aperture indeed. The lens has a powered image stabilisation system inside it and a number of aspherical elements. Fortunately the filter size is still reasonable at 67mm. Do not skimp on any additional glass you put in front of this lens - it is sharp at all apertures and you do not want to degrade to performance in any way.
Personal note: I used to put UV filters on every lens I owned until I got to the point of needing wide lenses, small apertures, and flash exposure against dark stage backdrops. Then the propensity of the flash to pick up very stray dust mote that might be on the filter meant every job was a trip to the Land 'O Retouching. I now remove the filters on indoor shoots, open up a lot more, and try to avoid really short lenses. It does help. I know I'll get a wet dog nose on the front element of a lens one day - or worse: a wet dancer nose - but I am prepared to take the risk. Actually, the risk of my fingers covered in paint and peanut butter is far more acute.
The Panasonic or Olympus shooter who wants to buy only one portrait lens - ever - would do well to consider this one. It will be a fixed star in their photographic firmament because they are unlikely to ever encounter better.