This glass filter is practically neutral in color effect. It transmits visible light without hindrance while cutting out ultraviolet radiation. Due to the short wavelength, UV is highly scattered and has a high intensity in hazy conditions as diffuse radiation. A color film reacts with a blue-violet veil and loss in contrast, while b&w film gives the sky a brighter look, thus reduces the contrast of the clouds against the sky and makes distance views pale.

Whilst under normal conditions, UV absorption of the glass of multi-elements lenses is sufficient to prevent the bluish cast and loss in contrast caused by the weak UV radiation, in the high mountain regions and at the sea, the intensity of the UV radiation may be so strong that a UV blocking filter is needed.

With a UV blocking filter in front of the lens, especially warm colors like yellow, orange and red remain pure and distance views become clearer and crisper. Because of the almost imperceptible absorption within the visible wavelength range, you do not need to extend the exposure time or to set a larger aperture. Thanks to its totally neutral color rendition, a UV blocking filter can also be used as a lens protection, e.g. against water splashes, wind-borne sand or even finger-prints.

The Rodenstock UV Blocking Filter is available with a slimline mount in sizes from 28 mm to 95 mm and 105 mm or with a standard mount in the sizes 27 mm, 100 mm, 112 mm and 127 mm. All of these filters are fitted with a female thread at the front side and a male thread of the same size at the rear. So an additional filter or a lens hood can be fixed.