Canon Lens Hood NIKON HB-23

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

Nikkor AF-S 17-35mm F/2.8 D IF-ED 
Nikon AF 18-35mm F/3.5-4.5 D IF-ED