What You Need to Know about UV Filters by Digital Photo Secrets: "When we think of UV, we think of sunscreen and ultraviolet rays. When it comes to photography, the thought of a UV filter is to protect the lens. But, what else does it do? To better answer this, it’s important to understand more clearly what UV light is. The visible light spectrum runs from red to violet. Red light has the longest wavelength and violet light has the shortest. Light with a longer wavelength than red is called infrared, and light with a shorter wavelength than violet is called ultra violet or UV."
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