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Fig. 4. Three-quarter front view, showing window over camera lens.
for opening the camera door to rethiead the film. The viewfinding actuating cam scrolls were generated to their respective lens-focusing distances at the full lens opening. The depth of the field of the lenses allows for normal human error in follow-focusing on a moving subject or when the camera is mounted on a moving platform in relation to a fixed subject.
Camera Blimp Design and Construction
The component sections of the blimp (Figs. 4 and 5) were designed to take advantage of the simplified method of fabrication which is possible with Royalite Plastic, a product of the U.S. Rubber Co.
The base and cover sections are reinforced with an aluminum frame giving additional strength and support for the cover hinge. The interior of the blimp is further soundproofed with Royalite expanded plastic and finished off with a corduroy covering. A rubber grommet, around the edges of the lower part of the blimp, acts as a seal when the cover is closed. The camera mount
ing base is a steel plate cemented the inner base of the blimp with |-in. thick pad of neoprene spon rubber between. Guide rails are tached to the base plate to register t camera when installing in the blim An aluminum alloy plate is rubbe bonded to the bottom of the blimp providing a firm support for the entire unit when mounted on a tripod, camera dolly or platform.
Other main features of the blimp are: (1) an optical glass window which hinged permitting access to the lenses for setting / stops; (2) portholes for observing /-stop markings when blimp cover is closed and to check on magazine take-up wheels; (3) external control for turret release button; (4) pilot light to illuminate the interior of the blimp when making lens adjustments, threading, etc.; (5) jeweled indicator lights which show when camera motor is running and pilot light is on; and (6) windows in the rear of blimp for looking through viewfinder, checking shutter openings and footage counter.
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August 1952 Journal of the SMPTE Vol. 59