Features:

• Reduces excessive blue
• Absorbs UV light and minimizes haze in outdoor photos
• Protects lens from bumps, scratches and dust
• Fits most lenses with 67mm thread diameter

Details:
These filters are used by many photographers to protect the front element of their lens from abrasions, dust, and moisture. They also have a very subtle warming effect, which can be useful to counter the "cool" colors you sometimes get in bright sun or in shade.