Canon EF 800mm f/5.6L IS USM High Grade Multi-Coated, Multi-Threaded, 3 Piece Lens Filter Kit (52mm) Made By Optics + Drop-in Filter Holder (52mm)

"This Item Includes: 1. UV Lens Filter 2. Circular Polarizing Filter 3. Flourescent Filter 4. Filter Pouch 5. Drop-in Filter Holder. Lens filters are translucent pieces of glass placed in front of a camera lens to alter or adjust the light entering the camera and more importantly to protect the camera lens. Lens filters improve photographs by giving photographers control over light and allowing them to emphasize the features of a scene that they consider most important.
This filter kit is a combination of the three essential filters no photographer should be without.UV--Film and a digital CCD are more sensitive to UV light than our eyes are. This often shows up in images shot from high altitudes and long distances especially over water. This filter will remove the UV light and more importantly protect your lens from moisture, scratches, and damage. Circular Polarizer--provides color and contrast enhancement. Reflected light often shows up as a whitish glare that washes out color in an image. A polarizing filter will correct this problem creating deep blue skies. It also removes glare from non-metallic surfaces such as windows and water.
FLD--provides color correction when shooting under fluorescent lighting. It will remove the greenish tint from the image, providing pleasing skin tones and true to life color renditions. Warranty:10 year manufacturer warranty. Made in Japan"