I bought the TCON-17 to use with my SP590UZ, giving an overall 44x optical zoom, as good as my birding binoculars and hugely greater than any other camera I've had, and achieved at far less cost than anything else I've come across. I'm still getting used to it but I'm generally pleased with it. Minus points: (i) they recommend using a tripod for this magnification, but the extra weight in front of the camera's centre of gravity creates its own problems, and I've actually had better results hand-holding it, (ii) in poor light, distant objects are not as sharply focused as I'd like, (iii) because of the need for the adapter, it takes a bit of time to connect it up to the camera, but leaving the adapter permanently coupled isn't the answer because it leaves one end of the lens unprotected. Plus points: (i) the lens is compact and comes in its own protective bag with caps and fits neatly into my existing equipment bag, (ii) both the lens and the adapter are robust and well made and the screw threads fit well, (iii) the (for me unprecedented) magnification has opened up potential that I'm only just getting to grips with. I've already got some wildlife shots I'm very pleased with using this kit that simply wouldn't have been worthwhile without it, or would have required much more expensive kit.