Lenmar 30.5mm Camlink UV filter
30.5mm UV filter
You can't see light in the UV (ultraviolet) spectrum, but some digital and film cameras can. What you might get is a bluish haze in your pictures. UV filters like the 305UV from Lenmar add subtle warmth (meaning more shades of red) by absorbing UV wavelengths without changing exposure settings. And since UV filters alter the light coming through your lens less than anything except a no color filter, you can just leave it in place to protect the lens.