This lens is not optically perfect. The bokeh is a little harsh, but that's okay. I want the aperture to be adjustable by 1/3 stop, but it gets adjusted by 1/2 stop. etc. etc. whatever. This lens costs a fraction of a used Leica Noctilux and is hardly worth a penny compared to a new Noctilux. Visually, the Leica isn't perfect either, but I suppose one can argue that the bokeh is noticeably better. Anyway, as a 50mm lens this is a solid 4 star lens: it sharpens well, doesn't have any major optical issues and is fairly well built. As an alternative to the Noctilux, this lens is a godsend.
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