Lens Construction 14 elements in 12 groups, including 2 AA (advanced aspherical) elements and three ED (Extra-low Dispersion) glass elements; Nano AR Coating; Fluorine front-element coating.
The edges are very good at f/4 and f/5.6, excellent at f/8, very good at f/11, good at f/16 and soft at f/22. At 20mm, central sharpness is excellent from f/4 to f/8, very good at f/11 and f/16 ...
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