I wanted cheap for my Sony RX100 more wide - and that provides these converters (for that I still needed a 52mm filter adapter for sticking). Clear: he zerzerrt orderly, he vignettiert a little, it is much more blurred (also dim helps nothing), there are more CAs ... ... for landscape pictures of imaging in A3 format, I would definitely get something else ... But who is looking a bit more inexpensive wide angle for snapshots is the right place. In addition there is an optically not at all times sooo bad macro lens that provides for the RX100 grade telephoto setting for significantly more magnification (of course you then need a lot of light and neat).
