Olympus M.Zuiko ED 40-150mm f/2.8 Pro

Excellent Construction, Sharp Images This lens is excellent in build, photo quality, and features. You won't know until you experience this with an Olympus lens-the manual/auto focus clutch on the lens is amazing!! Switching from MF to AF and back at the pull of a ring is invaluable really. I use this on my new Lumix G9, and I don't EVER wish I had opted for the Pany zoom with IS built in. I often use this on a tripod so I'd turn off in lens IS anyway. When I shoot handheld the glass is of such quality images will be sharp if I'm doing my proper job on the dials. It is SOLIDLY built, zoom is all internal. I consider it in keeping with the MFT motif of being a smaller lens than a comparable DSLR APS-C or FF equivalent (lots smaller relatively speaking), but not so small that you don't enjoy that...telephoto heft in your hand. If you enjoy telephoto zooms, this will not disappoint.Read full review

Amazing Lens for the Price Amazing lens for the price. Very sharp throughout its entire range. A little heavy for a m43 lens but that reflects the build quality, which is superb. With the E-M1 (or Mark II), it's not too difficult to shoot with one hand, though your arm may get a little tired after a few hours. It's much easier to just support the lens with your offhand. IBIS allows for very slow shutter speeds, so if your subject isn't moving much, you can keep ISO low. Manual focus clutch is a nice feature as well. And the 1.4x TC really provides a nice reach boost. Sharpness is still good wide open on the long end, though to get the same levels of sharpness you may want to stop down one stop. But it is certainly still useable wide open.

Good lens! Great lens. If you have a micro 4/3 camera (has smaller sensor than full frame) and you want the sharpest pics with it, get the best lens you can afford (like this one). If you are just taking family, pet, or travel pics and top quality is not as important, or you are not doing printed enlargements, then get a good cheaper lens.