Most add on lenses are designed to be used at a certain focal length, a zoom should be used (is most effective) when you are completely zoomed out, (really why would you add a zoom lens then not zoom all the way) a wide angle lens should be used with the zoom all the way in (cause your getting the widest angles). As far as quality, you really shouldn't have an issue except you may get black edges depending on how big the end of your lens is. Good luck
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