Used this on my E-P2 when I had it. Focusing is very slow but tends to be accurate (if your subject is a flower - pass on insects). I sold mine and am very happy with the PL 45mm.
If you are happy with MF, and a lot of people are for macro, try the Rokkor which is a stop faster than the 50 and two stops faster than the 45. I'm unfamiliar with that lens so I assume it is built as a close focusing lens - ie built for macro. If it's a general purpose lens it may be less suited for macro.
Many thanks Bill. Sorry if I misled in the first post but it's not Macro I'm interested in. I often use a lens around 85mm to 135mm on my FF camera and would like something like this for my new E-P1. I'm not at all used to manual focus, hence the interest in the Zuiko 50mm F2. If as you say, the focus is slow, I may be better off to save the money and go manual anyway.
I'm afraid I don't have the 50mm macro, but I do have the 35mm macro. Like the other 43 lenses I've used on m43 bodies, focusing is slow, so I suspect it will be the same with the 50mm. The results are nice, and I usually use a tripod, so the slow focus isn't a huge deal. This was the first 43 lens I tried out on my e-p1 and I felt like I had gone back in time to the mid-1980s as far as AF speed was concerned.
The upside is it makes AF with the 14-42 kit lens seem positively speedy in comparison!
Of course having said that, I have to admit I use my e-p1 more than any other camera I own, so obviously for me, AF speed is fast enough.
Love the ZD 50/2 not the AF, it's agonizingly slow, I use this for macro as well as still shots, it's probably the sharpest lens i had owned. still keeping it hopefully the rumored pro m43 body will support PDAF better...dreaming perhaps...and being so sharp for portraits this may not be a trait
rokkor 50/1.4 is a pretty sharp lens wide open with nice color rendition, easily gotten at a fraction of the 50/2 as well, however, when stop down, it's easy to see the bokeh balls become hexagonal due to low blade count.
haven't tried the 50/1.7 to comment..hope that helps
Thanks for the advice - very helpful. I have decided to stay clear of the Zuiko for the time being.
I haven't been able to find a 50/1.7 at a sensible price but I have picked up a Canon FD 50mm f1.4 and I'm liking it a lot. Manual focus on the E-P1 is working okay for me so far and the images I'm getting have a lovely feel to them.