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WHICH DO YOU NEED?
A Raven Crystal Beaded or Raven Haftone Screen
BEADED
1. Reflects a brilliant image.
2. Slight glare ( as with ALL beaded
HAFTONE
1. Image vivid but diffused.
2. No glare.
screens ).
3. Excellent for dull underexposed 3. Best for average negatives.
negatives.
4. Too harsh for colored transparencies.
5. Audience must be grouped about projection axis.
6. Best screen for the beginner in cinema photography.
4. Eastman Kodak buys HAFTONE for Kodachrome projection.
.5. Wide angle audience.
6. Best screen for the average amateur. Slightly modified, used in professional picture houses.
Raven Screen Corporation manufactures the most extensive line of screen fabrics and mounts of ANY screen manufacturer. No matter which of the 45 fabric-mount combinations you purchase, when you buy a Raven — you buy the best!
RAVEN SCREEN
314-16 EAST 35th STREET
CORPORATION
NEW YORK CITY
How often have you said "IF I COULD ONLY
AFFORD S0UND!W" "
YOU CAN
With this neu> Presto Recorder you can add sound to pictures at remarkably Unv cost.
correct speed, the enlarging paper may be attached under safe light by any convenient method. A soft or fast bromide paper is recommended in order to secure the best possible image. The light source which worked w^ell for the writer was a No. 2 photoflood in a reflector, over which was fitted a funnel so as to give a small opening for the light emitted and to cut out all stray light.
Before starting the turntable, place the cover on the box with the opening in the slide near the outside of the paper and the camera over the opening, as shown in Figure III. Then turn on the light with the open end of the funnel close to and at about 45 degrees to the mirror so as to reflect the light through the gate aperture, and run the camera for a few frames — two or three are sufficient. This will give the actual size of the slide opening as projected on the paper and is necessary for calculating the shutter speed.
Now you are ready for the test. Start the turntable and place the cover on the box. Set the camera for its highest frame speed, move the slide in enough so that the opening will clear the first exposure, start the camera with the lens wide open and switch on the light for just less than a second. The reverse method of having the light on and then running the camera will give errors in computation due to the delay in speed pick-up and is also liable to fog the paper. If the light is on over a second, the exposures will overlap.
Next, set the camera at the next lower speed, move the slide in again and expose as before. Repeat for each speed to be tested, being sure the hose is over the aperture in the slide and excludes all stray light. Then develop, fix and dry the test paper.
Figure IV shows a completed test with the net angles marked. T he actual frame speed of each speed tested is determined by counting the exposures for one-half the circumference and multiplying by two as the disk was revolving once per second. This particular test showed speeds of 46, 15 and 1 1 frames.
The single frame image at the top of Figure IV is the projected size of the slide opening. To determine the shutter speed at any given frame speed, determine the angle of one frame exposure after deducting the width of the projected slide opening. Be sure to deduct the actual width of the slide opening and not its angle. 'The total width of a frame exposure includes a faint image at the beginning and end, which is due to their having received a shorter exposure than the middle.
Having determined the angle of a given frame in degrees (after deducting the width of the slide opening projected), divide this angle into 360 degrees, and the resulting fraction gives
PRESTO MODEL M RECORDER
Lets you blend voice, sound effects and mus!c to be reproduced with your silent pictures.
Two 12u turntables, operating at either 78 or 33 >3 rpm., enable you to record and play records continuously without interruption.
Recorder may also be used to record radio programs, or as a 5-watt public address system.
Put life into silent films with music, sound effects, the voices of family and friends. Presto recording equals the best 16 mm. sound on film — yet it costs far less and the machine can be operated easily by anyone. Ask your dealer to write us and arrange for a free demonstration.
Complete data on request
PRESTO
RECORDING CORPORATION
273 West 55th Street, New York, N. Y.
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