($250-$500). Each of these lenses attaches to your smartphone with an included mechanical bracket, and connects using WiFi or NFC, letting you take the kind of pictures reserved, until now, for actual cameras. They can also function as stand-alone cameras, with a slot for a memory card and a shutter button. They currently offer two models, one with a large 20 megapixel sensor and 3.6x zoom, and another with an 18 megapixel sensor and 10x zoom.
Onyx
I need this!