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What is a UV Filter and Do You Need it to Protect Your Camera Lens?
A UV filter is a glass filter that attaches to the front of your camera lens and blocks ultraviolet rays. They used to be necessary for film photography, but now most photographers use them to protect their lenses.
from How-To Geek https://www.howtogeek.com/355998/what-is-a-uv-filter-and-do-you-need-it-to-protect-your-camera-lens/
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from How-To Geek https://www.howtogeek.com/355998/what-is-a-uv-filter-and-do-you-need-it-to-protect-your-camera-lens/
via IFTTT