Mark: V-e-r-y S-l-o-w t-o F-O-C-U-S on my GH2. I rented the Olympus 50-200mm f/2.8-3.5 ED SWD Zoom Lens for an indoor sports photo shoot and it was basically useless for any action shots because it took so long to focus. I had the Panasonic adapter.

Beth: Loved this lens and will be renting again. I rented it specifically to shoot lacrosse games but also ended up using it to shoot pictures of our high school's musical and got some stunning shots. The sports photos were also great, much nicer depth of field than I had been getting with my 70-300. The lens is heavy though so you definitely will want to use a monopod on the lens for the best shots. I initially thought I would miss the additional 100mm of zoom but the quality of the pictures made up for that. I'll be renting it this Fall to shoot football and am interested in seeing how the lower aperture than my 70-300 improves the shots I get at the night games. Based on the pictures from the musical I'm pretty optimistic!