There have been a bunch of those but none of them caught on, because their target market already has a smartphone. The idea I really liked was Sony that made "

There have been a bunch of those but none of them caught on, because their target market already has a smartphone. The idea I really liked was Sony that made "smart lenses" that was basically a decent sensor and a decent lens that you clipped onto your phone and connected via Bluetooth/WiFi and used the phone as a display and storage