UV Filter is a lens filter that protects the lens from scratches and dirt and absorbs ultraviolet rays to produce an image similar to that of the human eye.
It has no effect other than the absorption of ultraviolet rays.
Since most camera lenses are very expensive, leave it on the lens to protect it as a lens protector.
Kenko Nyumon series feature the Kenko coated polished optical glass that resists environmental conditions like impact and inadvertent touching of the lens from damaging your delicate lens surface. Mounted in a SLIM ring for maximum protection from unwanted vignetting on wide angle lenses.
Kenko Puro series feature a Kenko exclusive formulation of a special anti-stain mutli-coating that resists environmental conditions like water, dust, and oils from damaging your filter surface. The anti-stain multi-coating also allow for easy cleaning of your filter over the Kenko entry level Nyumon filter series. Mounted in a SLIM ring for maximum protection from unwanted vignetting on wide angle lenses.