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COLOR-REVERSAL 45
ance with Z38.21-1947 "American Standard Method for Determining Photographic Speed and Exposure Index.' '
Table III is a listing of some of the available reversal films and their characteristics.
( 2) Color-Reversal Film
The 16-mm color film that may be purchased in almost any photographic supply store is really a remarkable product. Although it is quite simple as far as the user is concerned, much accuracy is required in a large number of manufacturing and developing steps. Like blackand-white film, it is merely necessary for the user to load the color film in the camera magazine and give it the appropriate exposure.
Since the price of color reversal film customarily includes the cost of developing, the exposed color film is sent to the manufacturer for color developing. When the film is returned, the color is in the film itself. For projection, it is merely necessary to thread the film in a projector in the same way that black-and-white film is threaded.
At the present time only two manufacturers are marketing color reversal film in the United States — Eastman and Ansco. Both have been marketing color reversal film with the high direct-positive contrast characteristics suited to direct projection for a number of years ; two types are available, one for use in daylight, the other for use in artificial light. More recently Eastman has marketed Kodachrome Commercial, a color positive original film not suited to direct projection that has low-positive contrast compared with Kodachrome Regular. The contrast characteristics of a Kodachrome color print from a Kodachrome Commercial original are quite similar to those of an original on Kodachrome Regular. Generally speaking, the list prices of competitive products are about the same ; the professional user will not find the products interchangeable, however. No doubt many new processes and manufacturers will enter the competitive market in years to come, since the market is large and is growing rapidly.
The results obtained with both Kodachrome and AnscoColor are good when the films are correctly exposed. Because of the differences in manufacture and in processing, a side-by-side comparison of the two competitive films that have been used to photograph the identical subject matter under identical conditions will show marked differences in color rendering even though the detail-rendering ability of the two will be quite similar. The difference in color rendering will be particularly noticeable when subjects are photographed by daylight.