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After seeing some negative reviews about the Sigma 20mm 1.8 I decided to try it out for myself and come to my own conclusions. Firstly, I did not find the corner softness to be such a big issue as other people did. When shooting in low light this is almost to be expected and it is really not that bad unless you pixel peep your photos. What did take some getting use to was the switching from auto to manual focus and back. I think a few people will have trouble with that if they are not familiar with this. Fro the rest it is a pretty good lens that comes at a decent price and is capable of great photos. If I really wanted to nitpick I would say that it is a bit on the large and heavy side plus the focus motor can be noisy. I love the minimal focal distance however and the lens really is capable of great photos.