Used Leica 46E Ultra Violet (UV) Glass Filter with Black Mount

A Ova 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.