Product: 77mm UV Ultra Violet Protection Filter for Canon EF 17-40mm f/4 L USM Lens
Brand: Commander Elite Optics
This UV protection filter helps reduce ultraviolet light for better-looking results, plus offers a welcome layer of protection for your camera lens. Whether novice or professional, capturing the great outdoors on film can be immensely rewarding. The UV protection filter helps take it to the next level of awesome
 Absorbs Ultraviolet Light
 Reduces Bluish Cast of Daylight
 General Protective Filter
 Optical Glass Construction
 Aluminum Filter Ring

Absorbs UV light, which often makes outdoor photographs hazy and indistinct
Clear filter provides no additional coloration or contrast, allowing you to pair this filter with others
Works as general protection filter to reduce dust, moisture, and scratches from reaching lens elements
Multi-coating helps to reduce flare, ghosting, and reflections on the filter surface for higher light transmission of approximately 96%, resulting in greater contrast and color fidelity
Crafted from optical glass and a precision milled aluminum frame

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