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HOME MOVIES FOR MARCH
• Marine shots on this page illustrate results obtainable with three types of film: Super-pan and a filter made possible fine details in ship, water, sky and clouds in Fig. 1. Regular Pan was used in making Fig. 2. Note slight cloud detail in sky plus that of distant structure in background. Orthochromatic film was used for Fig. 3, netting a grey-white sky in spite of clouds exiiSting at time picture was made.
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[AVING become familiar with our camera and its lens through the discussions which comprised lessons i and 2 (see January and February issues), we are now ready to take up the subject of film. The types of film for amateur use are negative, reversal, and positive. Both negative and black and white reversal film is available in a number of types, i. e., a variety of emulsions — orthochromatic, panchromatic, and super (supersensitive) panchromatic.
In each instance the base of the film is the same — a ribbon of clear acetate film perforated to fit the sprocket holes of an 8 mm. or i6 mm. camera. It is the emulsion applied to this film by the manufacturer that determines the quality of photographic image it will produce and therefore the type of photography for which it
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%Vkat the beg.inner ^Itould know
is best suited. It is said of these emulsions that some are faster than the others, that is, one emulsion will record an image with much less exposure than another. Also, some emulsions have an inherent quality which enables them to record a wider range of color graduations. These emulsions are termed panchromatic.
Negative film, the first in the group mentioned above, is rarely used by the beginning amateur and not frequently by the advanced cinefilmer. The use of negative film involves added expense in that before a screenable picture is to be had, another film, positive, is necessary in order to obtain a print that may be projected. Negative film records pictures just
about
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as does a roll of negative film in a still camera. It is developed in a similar manner and then prints are made of it. It is commonly used in commercial substandard film production where several copies of the production are desired. The advantages of this negative-positive sys
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Fig. 3
Treacy Fig. 2