Three-Dimensional Photography - Principles of Stereoscopy

130 THREE-DIMENSIONAL PHOTOGRAPHY

and if it is not, all you have to do is to swing the symbol cor-
responding to your film (sun for daylight film, bulb for artificial
light film) under the index and the meter needle will tell you if
the light is redder or bluer than it should be and give some
approximation as to the amount of unbalance. Then you can,
with tolerable success, select an unidentified filter for partial cor-
rection.
Color correction is not new, but it has not yet become popular.
There is little doubt that when amateurs have had an opportunity'
to actually see for themselves the tremendous improvement which
it makes possible, it will take its deserved place as being just as
important as exposure control.