Canon EF-S 17-55mm f/2.8 IS USM, 19/12, 17 - 55 mm, Image stabilizer Canon EF-S 17-55mm f/2.8 IS USM. Lens structure (elements/groups): 19/12, Closest focusing distance: 0.35 m, Focal length range: 17 - 55 mm. AF actuator: USM. Product colour: Black. Diameter: 8.35 cm, Filter size: 77 mm, Length: 110.6 mm. Magnification: 0.17x http://www.photoanswers.co.uk/Gear/Search-Results/Photo-Accessories/Canon-EF-S-17-55mm-f28-IS-USM--/ With image stabilisation (IS), a solid f/2.8 throughout the zoom range and USM focusing, the Canon EF-S 17-55mm f/2.8 IS USM is about as close to a pro lens as many Canon users will be able to afford. ... http://www.photoanswers.co.uk/Gear/Search-Results/Lenses/Canon-EF-S-17-55mm-f28-IS-USM-/ The build quality of the Canon EF-S 17-55mm f/2.8 IS USM is good and as image stabilisation is lens-based, it can help improve your shots.The Canon EF-S 17-55mm f/2.8 IS USM offers a 27-88mm equivalent focal length on Canon cameras with a 1.6x crop fa... http://www.photoanswers.co.uk/Gear/Search-Results/Lenses/Canon-EF-S-17-55mm-f28-IS-USM-2/ The build quality of the Canon EF-S 17-55mm f/2.8 IS USM is good and as image stabilisation is lens-based, it can help improve your shots.The Canon EF-S 17-55mm f/2.8 IS USM offers a 27-88mm equivalent focal length on Canon cameras with a 1.6x crop fa...