Model: 12X1564K03At a glance:- EF-Mount Lens/APS-C Format- 17.6-32mm (35mm Equivalent)- Aperture Range: f/2.8 to f/22- Three Aspherical Elements- Three Low Dispersion Elements- Anti-Reflective Multi-Layer Lens Coating- SD-M AF Motor, Internal Focusing- One-Touch Focus Clutch Mechanism- Water-Repellent Top Coating- 9-Blade DiaphragmSpecifications:- Focal Length: 11 to 20mm (35mm Equivalent: 17.6 to 32mm)- Maximum Aperture: f/2.8- Lens Mount: Canon EF- Lens Format Coverage: APS-C- Focus Type: Autofocus- Image Stabilization: No- Filter Size: 82 mm (Front)- Maximum Aperture: f/2.8- Minimum Aperture: f/22- Angle of View: 104 to 72- Minimum Focus Distance: 11.02 Inch / 28 cm- Maximum Magnification: 0.12x- Optical Design: 14 Elements in 12 Groups- Diaphragm Blades: 9- Dimensions ( x L): 3.5 x 3.71 Inch / 89 x 94.3 mm- Length at Maximum Extension: 3.71 Inch / 94.2 mm- Weight: 1.25 lb / 570 g