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A PARALLEL OF 16 AND 35 MM. FILMS
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Film Shrinkage
35 Millimeter
Shrinkage of nitrate film is not excessive under average circumstances.
Safety film — same as 16 millimeter.
16 Millimeter
It is necessary to keep 16 millimeter (safety) film in humidor cans. Shrinks quite a bit if allowed to dry. Not quite as pliable or tough as nitrate film.
These disadvantages are offset by safety factor.
Fire Hazard
35 Millimeter
Though NITRATE 35 millimeter film is a slow burning film, fire regulations must always be complied with.
Usually booth and licensed operator are required.
16 Millimeter
ACETATE 1 6 millimeter film is non-inflammable.
This applies to all 16 millimeter film.
No special precautions are necessary for operating a 16 millimeter projector.
Illumination
35 Millimeter 35 millimeter portable projectors use 1000 watt and 500 watt lamps.
16 Millimeter The most powerful illumination available, at present, for 16 millimeter projection is the 375watt lamp.
Efficiency of Intermittent
35 Millimeter Best 35 millimeter projectors have 6 to 1 , while most have 4 to 1 movements, i.e., the light is cut off for 1/6 or % of the cycle.
Some flicker is usually noticeable on the screen.
16 Millimeter
Most 1 6 millimeter projectors have 9 to 1 or 6 to 1 movements. This allows more light on the screen for each cycle, so the "screen efficiency" of the lamp is much higher than with 35 millimeter projectors.
No flicker is visible at regular speed.
Ease of Threading and Operation
35 Millimeter All 35 millimeter projectors have enclosed film magazines. None are as easy to thread or use as the 16 millimeter projectors.
16 Millimeter Owing to safety of film, reels are exposed and easy to get at. Simplicity of use is one of the keynotes of 16 millimeter projector design.