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Due to the need for such compromise there are scenes where a
feather schedule can give good results for AB for example but BC is bad. On
changing to another schedule the reverse would be true. Since in printer #1
both feathers must work on the same schedule, the best that can be done is to
select the least disturbing condition. More frequently, however, no schedule
yields good results because of encroachment on the feather of camera
vignetting.
In some scenes where very serious camera errors had occurred
as in the underwater sequences in the first submarine roll, an attempt was made
to use false schedules in which the feather would be printed deeper into the
picture allowing the picture to be mismatched by a corresponding amount. Here
it was found that the sequence would open with a very heavy black line and
close with a pronounced white line as expected requiring violent mirror
adjustments. The effect is too disturbing to use in the picture. The same
effect could be expected if attempts were made to correct for slight picture
matching errors.
The motion of whole panels and disruption of the feather
character would seem to make it inadvisable to attempt picture mismatch
correction by means of false schedules in the printer for any but very rare
instances. This only points up the fact that the camera must be right, the
printer must not be used as a corrective device. The only means of "correction"
available to it are merely expedients which of necessity introduce other types
of errors. In certain cases an optical printer can make satisfactory
corrections in a dupe negative.
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