This lens is built to the usual high OM Zuiko quality. It's very handleable. Optically, it OK in terms of resolution but you do need the keep the shutter speed high (1/250 or faster), even on a tripod, even with aperture and mirror prefire, otherwise camera-lens vibration limits the resolution. In common with all longer focal length lenses (except APO's) once you have removed the effect of camera vibration, the abrerration you notice is colour fringing (blue or red fringes at abrupt bright/dark transitions). In this respect the lens is better than most. So in summary it's a good lens but it has to be used carefully to get the very best out of it. You won't be disappointed in normal use.