the frame is also partially knurled to give you some decent grip when screwing it into the front filter thread of your lens.

Regular CCD sensors are capable of recording UV light. UV-B light is absorbed by most lens materials, and UV-C light is absorbed by oxygen, making them mostly unimportant. While some video cameras may ...

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So it makes sense to keep it protected. Many photographers use UV, skylight or clear filters primarily as protection for the front element of their lenses. But with the light from your subject ...