The quality of the lens is very bad. But that's also the reason why you buy this lens. The icons on the focus ring are tremendously meaningful (from an imaged individual through to stylized mountain), which does not change the fact that it is almost impossible to make sharp pictures with it. The vignetting is catastrophic, the colors are grauenha .... In short it is a wonderful, affordable lens for anyone who likes to do something other images and / or is a fan of Lomo. Strong buy recommendation, even if the images are partially better than they would have liked.