BAVA 77mm lens wide band pro MRC digital lens protector UV filter for all 77mm lens

What is UV (ultraviolet) light?

The visual spectrum—the light we see with our eyes—consists of the colors red, orange, yellow, green, blue, indigo and violet. Mix them together and you get “white” light. The electromagnetic wavelengths of light are measured in terms of nanometers (nm), with the visual spectrum residing in the 390 to 750nm portion of the electromagnetic bandwidth. Just below the red end of the visual spectrum is infrared (approx 750nm to 1mm) and ultraviolet light resides just above the blue end of the visual spectrum (approx 10nm to 390nm). While we cannot see UV light, it nonetheless impacts the visual quality of the pictures we take.

How does UV light affect photographs?

UV affects image quality in several ways. When photographing outdoors UV light manifests itself in the form of haze, which can vary based on how close you are to large bodies of water or snow (water and snow both reflect sunlight, which in turn magnifies UV levels), altitude (the higher you go, the more UV light you encounter), and larger cities (reflective glass and metal-clad structures can also amplify ambient UV levels). This haze robs image detail, especially at longer distances with longer focal length lenses where cumulative haze densities can severely soften the sharp details of distant objects. In many respects, this neutralizes the argument against using filters for fear of compromising the resolving power of the lens, most notably telephoto lenses.

Unlike moisture-related haze, which can be controlled through the use of UV filtration, smog, a major component of urban haze, is not reduced by the use of a UV filter. The reason for this is that smog is made up of solid particles, not reflected light.

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