I haven't used this lens so I can't speak from direct experience. I will say that my general experience and most reviews I've read for screw on adapters like this one aren't very good. However, I looked at the Flickr gallery Greg McCary linked to and the images look pretty good to me. Of course, I don't know what kind of post-processing the photographers did on those images. If you really want to do macro with your S5 IS and the price is right I think it's probably a good buy.