The Hoya HMC Ultraviolet UV Filter is a multi-purpose, fine-weather filter that is designed to optimize the photography experience of the digital SLR user. UV filters, which absorb ultraviolet rays that often make outdoor photographs hazy and indistinct, should be constantly fitted to a lens to provide improved clarity and color balance,as well as to provide protection to your lens. Hoya Digital HMC filters are optimized for use with digital SLR cameras, but they are also perfect for traditional 35mm SLR applications, includingblack and white photography.Using Hoya Digital HMC UV Filters: Hoya"s Digital HMC UV Filters absorb the ultraviolet rays which often makes outdoor photographs hazy and indistinct. It is also a muliti-purpose fine-weather filter for color as well as black and white films, and serves as a permanent lens protector. Your natural light pictures will be sharper, crisper and better balanced than ever before!