I've been experimenting with the Zuiko Digital 40-150mm lens for a few weeks. I probably wouldn't pay any attention to a lens like this because it's such a consumer lens - plastic lens mount, variable aperture, etc. However, it's tiny. And it's comparable to an 80-300mm lens on a 35mm camera. So I thought I'd give it a shot.
I first used it with the E-P1. Image quality seems pretty good with the E-P1, but the auto focus is, well, horrendous. I shot a little mountain biking with it and then some NASCAR pit photos a couple of weeks ago. When they're in focus, the images are nice. But focus is difficult - too difficult to bother with, I think.
So this weekend I finally put the 40-150mm on the E-620 and took it for a ride. I'm happy to say the auto focus is much more responsive with the E-620. It's still not perfect, though. In the mountain bike photo I'm posting here, I tried to focus on the flowers to the right of the trail and ended up getting the background. Since I shot a sequence, the first shot, which shouldn't have been good, was barely usable. So if I want critical focus, I now know I'll have to prefocus more carefully. For this photo I should have had Jenni stand in the trail where I wanted to take the picture so I could pre-focus.
The other three photos were taken today. I wanted to play with it some more so I could make this post. I will do some more and then I think I'll do an actual review. But after using the 40-150mm lens on the E-620 I think I like it. It's so tiny, light and inexpensive yet it offers a whole lot of reach. I wouldn't recommend trying to use it with the E-P1, though.