The Kenko 43mm Real Pro MC UV Filter is a two-purpose filter.
Its principal function is to cut out UV light, which is the main cause of hazy photos on sunny days, however it also serves as a front-mounted lens protector that may just save your lens' front element from serious damage.
Kenko's Anti-Stain Coating repels moisture and makes the filter easy to clean, while Anti-Reflection Multi Coating provides superior light transmission to prevent flare and ghosting.