October 31, 2013
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.
April 05, 2013
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. Looks absolutely great on the E-M5. It's fun to use and I've been using it a lot since I got it three days ago.