I use with Olympus OM-D E-M10. Of course, this lens is not at all as sharp as the Olympus 25mm f/1.8 and Olympus 45mm f/1.8 primes, but better than the kit M. Zuiko 14-42mm. There is no electric zoom drive, but I hardly shoot video, so I don’t need it. There are some minor geometric distortions. Especially at a short focus, a "cushion" is noticeable, and at a long focus, a little bit, but a "barrel" appears. I didn't look, but I think somewhere in the middle you can find a complete absence of distortion :) For such a price, in my opinion, this degree of distortion is completely acceptable.
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