The HN-N102 Lens Hood (Black) from Nikon
is a screw-mount lens hood compatible with the 1 NIKKOR 11-27.5mm
f/3.5-5.6 lens. Lens hoods act to deflect unwanted light from entering
the lens and producing light flares. They also add a level of protection
for the lens from accidental impact. A screw-mount lens hood stays on
securely and a hood designed specifically for one lens will best serve
that lens' angle of view.