Use these filters to control the contrast of variable gradation photo papers.
A set of circular filters under the lens for contrast control of variable gradation papers.
The set contains 12 filters, which are numbered from 0 to 5 in increments of 0.5. The number 5 represents the highest contrast, 00 the lowest.
There is no need to think too much about changing the exposure when changing the contrast, all filters from 00 to 3.5 have the same exposure, filters from 4 to 5 have exactly double the exposure.
Reference: ptr00036
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