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50
AMATEUR MOVIE MAKING
correspond with the same stop number to which the arrowhead of 1/35 directs on the first or stop ring of the Cinophot.
This is, then, the proper lens aperture for correct exposure at normal frequency of 16 frames per second and on regular cine film.
It is entirely practical to use the Cinophot in this manner for all usual movie camera models. The theoretical exposure speed may be from 1/25 to 1/50, yet the Cinophot marking at 1/35 is a practicable average and the exposure difference is easily absorbed by the latitude of the film emulsion.
For more fastidious discrimination, the following applies :
OPEN
SHUTTER SECTOR :
EXPOSURE
AT 16 FRAMES
PER SEC:
LIKE CAMERA MODEL :
APPLY LENS APERTURE
CORRESPONDING TO:
Over 200 degrees
About 180 degrees
1/20 to 1/30 Sec.
1/30 to 1/40 Sec.
Victor and Filmo Cameras
Cine Kodak,
Filmo Three
Speed, De Vry
1/25 1/35
This shows that, for instance, users of Filmo and Victor cameras may read the Cinophot with 1/25 in position within the instrument, and set their lens diaphragm directly to the stop number indicated by the Cinophot iris diaphragm pointer. Such users need not manipulate the second ring, unless poorer illumination causes them to use 1/5, or even 4, within the Cinophot.
Cine-Kodak, DeVry or Filmo Three Speed camera users will place the second ring as instructed and read their lens aperture below the prominent arrowhead mark of 1/35.
For use with cameras permitting a variable angle of the open shutter sector, refer to the third or sector ring of the Cinophot.
Below each group of degrees appears the corresponding