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Kinda mixed bag this one, tried 3 examples and ended in returning them. Center is great but at 17mm far corners were mushy at all apertures. Also, at 50mm when shooting flat surfaces from a short distance corners were absolutely sub-standard. So don't even dream of shooting paintings or book pages with this. Or then leave some space for cropping the corners out. But if you are aware of these limitations and don't mind go and buy it, it is very good between 20 and 35mm.
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