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Opinion:I state that I am a simple amateur photographer but I must say that for my experience this optics gave me great satisfaction and returned beautiful photos. I took it second-hand safe used on ebay. Precise Af even in low-light situations, sharp enough at all focal lengths. Perhaps the shorter focal suffers from perspective distortion that corrects itself in post. Great if you have to take a trip and not bring so many optics behind to change. At 28mm you can do it quietly Street and also some portrait set. It resisted rain wind of the desert etc. I recommend it.