Samigon Multigrade Filter Set 3 x 3"
Contrast control with multigrade and variable contrast black & white photographic papers can be achieved in several ways. One of the most widely used ways is through the use multigrade or variable contrast hand filters.
A magenta filter absorbs green light and transmits blue;
A yellow filter absorbs blue light and transmits green.
In this way, high and low contrast images can be made.
Samigon Multigrade Filters expand the range of black and white paper emulsion into 7 contrast levels. 1, 1 1/2, 2, 2 1/2, 3, 3 1/2, 4, .with the lowest filter number corresponding to the softest contrast.
Set of 7 graded extra thick 3" filters in individual pocket case. Filters may be trimmed with scissors to fit filter drawer of almost any enlarger. They may be used with Kodak Polycontrast, Ilford Multigrade, or any variable grade black an white paper.
Multigrade filters are very easy to use: no complicated calculations are needed when changing from one filter to another. The exposure time for filters 00 - 31/2 is the same; that for filters 4 - 5 is double.