The Lee Gel Snap Filter Holder plus the Lee Black & White Set which is a group of four 4x4 inch, framed polyester filters for use in the Lee Gel Snap Holder.
All absorb varying degrees of the blue and blue-green parts of the spectrum, creating different tones and contrasts of skies and foliage on black & white film. They can also be used to create speical effects.
The #8 is a yellow filter which darkens sky and foliage to produce correct tones. The #11 is a yellow-green filter which is used to alter the response of panchromatic emulsions to be the equivalent to the natural response of the eye to objects under tungsten illumination. The #21 is an orange filters which darkens blue-cyan. The #23A is a light red filter wich darkens green (commonly used to darken foliage.)
