Features:

• UV haze filter to protect lens from dust, moisture, and scratches
• Absorbs roughly 71 percent of UV rays to improve image
• Eliminates bluish background haze that obscures some details
• Sits on lens at all times for maximum protection
• Easily screws onto all 77mm lens

Editor Reviews:

Product Description:
Canon is a leader in professional business and consumer imaging equipment and information systems. By developing innovative, high-quality business solutions Canon makes it easy to create, manage, and share images and information better, faster, and more efficiently.

Amazon.com Product Description:
The Canon 72mm UV haze filter not only helps to protect your lens from dust, moisture and scratches, it also allows you to correct for UV effect and eliminate haze from your photos. This filter will absorb approximately 71 percent of UV rays, helping to eliminate haze's bluish cast that can obscure distant details. This filter easily screws onto your 77mm lenses.

Rating : - ok, but you may be better off with no filter at all
if you're using a hood for your lens, you probably don't need a UV filter, but if you shoot a lot without a hood, this might be a good option.