B+W KR 1.5 [1A]
Due to its light pink color, the KR 1.5 reduces the blue cast of daylight and results in a pleasing, warmer picture tone. At the same time, it blocks ultraviolet light and reduces haze in the scene. It is also known as a skylight filter and, like the UV 010, it may be kept permanently on the lens for protection. Filter factor is approx. 1.1.

B+W KR 3 [81C]
This filter is strongly recommended for daylight photographs, especially in spring and summer with cloudless skies and clear air. It helps eliminate the strong blue tone and haziness which is produced by this level of ultraviolet light. Furthermore, it will reduce the unwanted blue tone in shadow areas with an overcast sky. Filter factor is approx. 1.2.

B+W KR 6 [81EF]
Daylight with a high percentage of blue (midday in the mountains during the summer) is neutralized by the KR 6 in color photos where an extreme blue tone is to be expected. Not only does it block ultraviolet light and reduce blue tones in the shade, but it also penetrates light fog. Filter factor is approx. 1.4.

B+W KR 12 [85EF]
When using the brown toned KR 12 with tungsten-balanced color film, one can photograph in daylight or with flash illumination. This eliminates the strong overall bluish cast which would be present otherwise. In addition, many color films respond to this color conversion filter with particularly brilliant color tones. Filter factor is approx. 2.0.

B+W 81A
This filter balances color temperature from artificial light sources to the color tungsten film standard of 3200 degrees and balances the difference up to 3400 degrees. Due to this characteristic, a noticeable warmer color reproduction is produced. This fine balancing is important for special work such as art reproductions where true color reproduction is required. Filter factor is approx. 1.2.

B+W 81B
The 81B makes possible a stronger color temperature balance from artificial light sources to 3500 degrees which also results in a slightly warmer color reproduction. In addition, when using artificial light for portraits, especially when more flattering warmer colors are appropriate (portraits of women and children), this filter is highly recommended. Filter factor is approx. 1.2.

B+W KB 3 [82C]
Red tones, which are in the middle color temperature range, are eliminated with the KB3.This filter corrects the frequent tendency toward reddish tones when using 500 Watt flood lights with tungsten film. The KB3 is also necessary when using older nitrate photo lamps. Filter factor is approx. 1.2.

B+W KB 6 [80D]
This middle-blue filter reduces the strong red tendency of morning and evening light. This filter is used for the optical reduction of extreme yellow, orange and red elements of scenes. Filter factor is approx. 1.5.

B+W KB 12 [80B]
This dark-blue filter acts as a color conversion filter by converting artificial light of color temperature 3400 degrees K to daylight color film. Without it, strong yellow-orange color tones would occur. Filter factor is approx. 2.