Lee SW150 Black And White Filters are widely used by black & white photographers for creative effect – most commonly to increase contrast between sky and cloud. However, care should be taken, because as much as a black & white filter darkens one colour, it lightens another – specifically, any colour that is similar to its own. A red filter, for example, makes a red pillar box appear almost white, and a blue sky as almost black. However, a red filter also absorbs green, which would block up the foreground of a verdant landscape.
The black & white filters in the Lee SW150 Black And White range can be used in conjunction with others, such as the polariser and neutral density standards and graduates.
11 Yellowish Green Standard
Alters the response of panchromatic emulsions to be equivalent to the eye responding to objects under tungsten illumination.
12 Deep Yellow Standard
Minus blue filter. Can be used to cancel blue light when infrared-sensitive films are exposed. Also penetration of haze during aerial photography.
15 Deep Yellow Standard
Increases contrast between cloud and sky greater than No. 8, for over-correction effect. Also used for copying documents on yellowed paper.
16 Yellow Orange Standard
Gives even greater over-correction than No. 15. Absorbs a small amount of green.
21 Orange Standard
Contrast filter. Absorbs blue and blue/green.
23A Light Red Standard
Greater contrast effect than No. 21 Orange.
3 Light Yellow Standard
Partially corrects for excess blue in aerial photography.
8 Yellow Standard
Darkens sky, cloud and foliage to reproduce correct tones.