While it's nice to know that with an adapter I can use my Canon EF 135mm f/2 on my GH2 but it really is quite limiting since I don't have direct control over the aperture of the lens. Not having stabilization is another limitation since nailing just exactly where I want to put the very shallow depth of field at the maximum aperture I get with this camera lens combination, is a hit and miss situation. In this case, by luck, it worked. I focused on the front petal. I think I'll stick with my image stabilized Canon 7d 300 f/4L IS lens. It's great in macro mode and easier to focus when the image is not jumping around.