EF 28-70 mm f2.8 L USM
One of the most important accessories for each lens you own. A lens hood provides multiple functions: it shades the lens from stray light, improving your contrast and image quality; in inclement weather, it can assist in keeping moisture or wind-blown debris off the lens; and it protects the front barrel from the inevitable impacts against walls, door frames, and other real-life obstacles. Almost all EF and TS-E lenses have a Canon lens hood engineered specifically for it.
Canon EF 28-70 mm f2.8 L USM, 16/11, 117.6 mm
Canon EF 28-70 mm f2.8 L USM. Lens structure (elements/groups): 16/11, Focal length range: 117.6 mm, Thread diameter: 3.28" (8.32 cm). Filter size: 3.03" (7.7 cm), Weight: 31 oz (880 g)