The tokina 16 28mm f28 at x pro fx af lens has been designed for full frame professional digital slr cameras where the 16 28 zoom range gives a super wide angle the lens can also be used on smaller sensor slrs but the resulting angle will be less wide this extreme angle can be used to get close to subjects for dramatic effect or to take in entire landscape scenes with a quick and quite focusing motor ashperical and super low dispersion glass elements and an easy afmf lens barrel the tok