About the Canon UV filter
This Canon filter screws on to the front of your lens, and protects it from minor bumps and scratches. You can leave this type of filter on at all times to protect an expensive lens. It also absorbs UV light, to give your outdoor photos a slight warming effect.
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More details on the Canon UV filter
Overview: The UV Protector helps protect your camera or camcorder lens against dust, moisture, fingerprints, scratches, and damage while providing basic protection against UV light. It can be kept on your camera lens at all times. The UV Protector threads onto the end of your camera or camcorder lens. This UV Protector will fit 58mm lenses which feature a threaded lip.