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MovingElectrons.net8.7 There is not much that can be criticized from the built quality perspective, other than the lens cap. [...] One of the nicest things about this lens is that it’s a rectilinear lens (i.e. non-fisheye), which is not easy to find at this focal length. On the downside, at f/5.6 it’s a fairly slow lens. It has a better sharpness performance than the Voigtlander 10mm f/5.6, and almost as good as the Voigtlander 15mm f/4.5.