Olympus M.Zuiko digital ED 12-45mm 4.0 PRO

The Olympus M.Zuiko ED 12-45mm f/4 PRO offers very high performance in a very small package. In terms of sharpness, it doesn't show any major weakness across the zoom range. If anything, the borders/corners could do with a bit more bite at the 12mm. Micro-Four-Thirds is auto-correcting most of the other technical image aspects. Thus there's just a hint of barrel distortion at the wide and the vignetting is quite moderate. When looking under the hood, the distortions are extreme at the 12mm setting, though. Lateral CAs are low and nothing to worry about. The quality of the bokeh is generally Ok within the limited capabilities of the slow max aperture at least. Despite being tiny, the lens remains true to its "PRO" designation. It features a tightly assembled, weather-sealed, metal body and smooth control rings. The AF is both quick and noiseless.

The Olympus M.Zuiko Digital ED 12-45mm f/4 Pro is a new compact, lightweight and weather-sealed professional standard zoom lens for the Micro Four Thirds system. Featuring a 35mm equivalent focal range of 24-90mm, the Olympus M.Zuiko Digital ED 12-45mm f/4 Pro offers a constant maximum aperture of f/4 throughout its zoom range, fast and quiet auto focusing, and an optical formula comprised of 12 elements arranged in 9 groups, including an aspherical and a dual-super aspherical element.

The Olympus M.Zuiko ED 12-45mm f/4.0 PRO lens is a very useful standard zoom with good solid performance.