All stock codes associated to this product
, 121095003037, 12-1095-0030-37
UV blocking filters and UV/IR blocking filters
These glass filters are practically neutral in color effect. They transmit visible light without hindrance while cutting out ultra-violet (UV) radiation. UV/IR filters block infrared radiation, too. 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, 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 UV blocking filters are needed.
With a UV 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 salt water splashes, wind-borne sand or even finger-prints.
UV/IR blocking filters have been specially designed for digital or video cameras. They filter UV as well as infrared (IR) radiation which, due to the high IR sensitivity of CCDs, can lead to reddish color shift, fogging and blur (because normal camera lenses are not color corrected for the long IR wavelengths).
