Conclusion: The Zuiko Digital ED 9-18mm 1:4-5.6 is without doubt a very good lens indeed, especially for a relatively inexpensive ultra-wideangle zoom. It's sharp even wide open, has negligible distortion, and shows practically no vignetting. Indeed it's a delight for pixel-peepers looking for high levels of sharpness right across the frame; there's little of the drop in sharpness towards the corners that is often encountered with wideangle zooms.
Pros: High image quality - decently sharp from centre to corner even wide open, Extremely low distortion, Essentially no falloff/vigmetting, Small and lightweight
Cons: Moderate chromatic aberration (although not excessive for an ultra-wide)
Excerpt: This compact ultra-wide angle zoom lens for Micro Four Thirds system cameras offers a 2x zoom range equivalent to an 18-36mm lens on a 35mm camera. It costs around £450 and sports a collapsible design.
Pros: Collapsible design, Lightweight, Fast, silent autofocus, Excellent sharpness in the centre of the frame throughout the zoom range, Low distortion, Good value compared to alternative
Cons: No lens hood supplied as standard, High CA levels towards the edges of the frame beyond 14mm, Prone to flare
Olympus M.Zuiko Digital 9-18mm f/4-5.6 ED - Review / Test Report
22 July 2012
Conclusion: The Olympus M.Zuiko 9-18mm f/4-5.6 ED is an engineering masterpiece. It is the most compact and light-weight ultra wide angle lens that we've reviewed to date. It is easy to use despite its small size and rather unusual retractable design. Olympus managed to keep the build quality on high level which is a big step forward from the M.Zuiko 14-42mm kit zoom lens. The AF is basically silent and very fast and as such also very usable for videos.