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Photojojo smartphone lenses
Photojojo's smartphone lenses are always tucked away in my bag if I don't have my standard camera kit with me and a photo opportunity appears. A small magnetic ring fits around your smartphone's camera, and then each individual lens can be snapped on and off at your leisure. The lenses feel sturdy and look great, and for the price bracket, the quality of images is vastly improved. My favorite option is the Super Fisheye.
Price: $20 - $99
Orangemonkie's Foldio takes smartphone photography lighting a step further. The Foldio is a collapsable, mobile lighting backdrop -- complete with magnets to seal its shape and an internal, embedded LED lighting strip. If a standard white backdrop doesn't take your fancy, you can switch sheets to various colors, and the premium version is equipped with two LED strips.
Price: $49 - $59
USBFever lens kit
Available on Amazon, USBFevers' smartphone lens kit comes complete with a fisheye, wide angle & macro lens, as well as telephoto lenses of varying zooms. The lenses can be attached via an iPhone 5 cover.