Olympus OM G.Zuiko 28mm f3.5
The lens is made of metal, it weights around 150g, it is 32 to 35mm long and it has an external diameter of 60mm, with a 49mm front thread. The iris has 6 blades, the aperture is clicked and it goes from f3.5 to f16 without half steps. The focusing ring is rubberized, it turns 80 degrees and minimum focusing distance is 30cm. The Olympus OM mount has a flange distance of 46mm. The engravings on the front tell us some more: the letter G indicates the number of elements, seven, auto for automatic diaphfragm and W for wide angle. It is small and very light, so it won’t throw off the balance even on small mirrorless bodies. The aperture ring is a bit narrow but being in the front it is still easy to operate. Sharpness wide open is very good with some fuzziness in the corners. By f8 it gets even sharper all over the frame. At all apertures is lacks some of the finer details. It has a noticeable distortion. Chromatic aberration is present wide open, but mostly hard to notice. Colors are fa