126 THREE-DIMENSIONAL PHOTOGRAPHYand-white. In short we are slowly becoming filter conscious in
color work.
Yes, it does involve trouble. You must carry a certain number
of filters, you must make the color reading, you must apply the
correct filter. All that takes time, as much as two or three minutes,
but when the stereogram is complete, it will be with you for years.
Is your time so valuable that you cannot devote two or three
minutes to producing a good slide when otherwise you would
only have a poor one?
Or look at it this way. You will spend a whole day, and use a
magazine of film in making 20 exposures. Careless color technique
means you will probably get not more than five good slides. But
one hour divided among the 20 exposures, at the most, will in-
sure at least 15 good color slides. If you can devote eight hours
to five slides or more than 1.5 hours each, you can surely devote
nine hours to 15 slides, which is considerably less than a half hour
each1 And we do not even mention the money invested in the
lost film.
If color is worth doing, it is worth doing well. Take your time.
It is better to make a half dozen good slides in one day than to
produce a hundred mediocre ones which you will not value,
Most stereographers prefer to use one type of color film for all
purposes, thus avoiding the necessity for two cameras or for
wasting film. Therefore it will not be necessary to have the full
stereo set of^44 filters. The table below indicates the Harrison &
Harrison color correcting filters to adjust any film to any ordinary
light.
Light
"3~00" tungsten
Photoflood
Wire filled flash
Late daylight
Noon sunlight
Sun and sky
Average daylight
Shade-S trobe-light
Sky light----
Daylight
B5
B4
Bz
B%*
B1/4cl/,
c!4
C%f*HazeMazda
None
cl/,
cl/,
Cz f
c3
c4
c5
C6
(2''
* May vary to call for Bi, Cl/, and Ci.
** May vary to call for as much as C2, C7 and C8 respectively, or
even enough to necessitate up to C7 with daylight film.