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Fisheye Pro lens
If your student is a fan of photography but doesn't have a DSLR -- and is therefore not able to buy different lenses for a camera body -- the Fisheye Pro lens is a fun way to give smartphone photos the warped "fisheye" look. Once snapped on to a mobile device with a magnetic ring, you're set.
The lens, also available as part of a kit, is compatible with Blackberry, HTC, iPad, iPhone, LG, Sony Ericsson, Nokia and Samsung mobile devices, among others.
Price: £32.99 ($50)