Summary: Until they come out with a 300mm prime this will have to do. It is a long way from the 75mm f/1.8 and I am spoiled by that lens. I stay away from the full 300mm limit and don't stop it down too much. If you don't look too closely the images are fine and for the price it is a good value. I tried some old 35mm Minolta primes in this range and this lens is a lot better than the ones I tried so I am satisfied.
Summary: Waited on Olympus for over two months and finally gave up on them and ordered it from a local brick and mortar. I found this lens to be mechanically superb. No lens creep for one thing, and balanced beautifully on the E-M5 with or without a tripod. It's lighter than competing 100-300mm lenses. Very sharp at focal lengths near wide open and good enough for the price out to near 300mm, a little soft at fully 300mm. Focuses quickly without searching.
Summary: There aren't a lot of choices for a 300mm lens in the M4/3 world. I was a bit hesitant to purchase this lens because reviews said it was soft at 300mm. It is compared to the excellent sharpness it exhibits at shorter focal lengths. At 300mm it is fine not outstanding but much much better than the manual focus Vivitar lens I was using via an adapter. Overall I am pleased with this lens it's compact, light and well built.
Summary: I've knocked a star off because it's not perfect, but then again, I doubt many lenses are. The missing star is also because of Olympus' annoying practice of not including a lens hood, which you then have to go off and source - usually at too much cost and often with some difficulty. I've tried it in a variety of lighting conditions, including the lesser-spotted bright sunlight situation.
Summary: Dieses Objektiv bleibt zwar deutlich hinter teureren und sehr teuren Olympus-Objektiven zurück. Gemessen an seiner sehr handlichen Größe und seinem nun wirklich geringen Preis ist es jedoch ein No-Brainer. Ich habe mit dem Objektiv auf der OM-D E5 bei Brennweite 300mm (also in Wirklichkeit rund 600 mm) bei 1/100 Sekunde aus der Hand gehaltene Fotos machen können, ohne dass Verwackelungserscheinungen sichtbar wurden (die Kombination mit der richtigen Kamera spielt hierbei...
Summary: Ich besitze eine Olympus E-M5 und wollte dazu eigentlich auch ein Olympus Tele-Zoom. Zweimal habe ich Anlauf genommen. Zweimal leider vergeblich. Das 75-300 kann meinem Panasonic 100-300 leider nicht das Wasser reichen. Trotzdem ein gutes Objektiv.