A UVa filter is available as an accessory for every LEICA M lens. In addition, there is also an orange and a yellow green filter available for some of them.
Film, as well as video, often exhibits a greater sensitivity to what is to us invisible, ultraviolet light. This is most often outdoors, especially at high altitudes, where the UV-absorbing atmosphere is thinner; and over long distances, such as marine scenes.
It can show up as a bluish color cast with color film, or it can cause a low-contrast haze that diminishes details, especially when viewing far-away objects, in either color or black-and-white. Ultraviolet filters absorb UV light generally without affecting light in the visible region.
Reviewed by 2 customers
I tried to use the filter under water taking pictures of the so-called Locke Ness Monster. The pictures I took of "Nessie" did come out too blue. This is not what the advertising stated. Very disappointed.
The glass was covered with smudges and moved within its frame.