Olympus M.ZUIKO DIGITAL ED 75-300mm F4.8-6.7 II lens review: Updated design and new lower priceBy Kevin Carter - Friday July 26 2013 Lens Review
Mounted on an 18-Mpix Panasonic Lumix DMC-GH-2 the updated lens achieves a DxOMark Lens Score of 10 points and ranks as one of the best performing micro 4:3 mount telephoto-zoom lenses in our database.
However, that and the Sharpness score are on the low side, the latter especially given the pixel count of the GH-2. Peak performance is at 100mm at f/5.1(wide-open). Unusually, in a lens like this, distortion is very low and is unlikely to be noticed at any focal length.
Vignetting is also suitably low, though that is expected in a lens with a slow-variable aperture. Control of chromatic aberration is generally good, but it could be noticeable in certain (high-contrast) images at 100mm and 150mm.