Abstract
An analysis is made of the factors governing the apparent depth of field in a picture as judged by a person seated in the audience. The greatest depth of field results, for the same final magnification on the screen, when the focal length of both the camera and projector lenses are kept as short as possible. This procedure results in a greater magnification in projection, and the graininess of the film begins to be apparent if the process is carried too far. Actually the limit of magnification with 35 mm. film has been nearly reached with existing materials. — It is shown in this paper that the use of a wider film for both negative and positive does not alter the depth of field, provided the same over-all magnification is used. Similarly, making a large negative and a smaller print has no effect on the depth of field under comparable conditions.
Published Version
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