I've brought this wide angle conversion lens for my 55mm ring the lens is actually a 46mm in enter but I've got stepdown rings and it fits quite nicely. But I get this bad distortion/blur/colouration in the corners. Why would this be? Is the lens not suited for my cam or is it because I'm stepping down too much? Here are a few shot small and one really big one so you can see exactly what I'm talking about...

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