This new lens does what many pros thought couldn"t be done - replace the previous L-series 28-70 f/2.8 lens with something even better. Extended coverage to an ultra-wide angle 24mm makes it ideal for digital as well as film shooters, and the optics are even better than before with two Aspherical elements and a totally new UD glass element. It"s now sealed and gasketed against dust and moisture, and a new processing unit makes the AF faster than ever. Zoom System - Rotating type Filter Size - 77mm Max. Diameter x Length, Weight - 3.3 x 4.9, 2.1lbs. / 83.2 x 123.5mm, 950g Item includes - 77mm Snap-On Lens Cap; Lens Dust Cap E (Rear); EW-83F Lens Hood for 24-70 f/2.8L Lens; LP1219 Soft Lens Case, Canon 1-Year Warranty