Sheet Film

Figure 2-5.–Notch codes used to identify the type of film. Figure 2-6.–Location of notch code that indicates the emulsion is toward you. The most popular medium-size format film is No. 120. This film, depending on the camera format, provides negatives that are 6x6 cm (2 1/4 x 2 1/4 inches), 4.5x6 cm, or 6x7 cm. No. 220 roll film is used for making the same size negatives, but because most of the paper backing is eliminated, the roll is longer than a 120 roll and provides twice as many frames as 120 film. Still picture 35mm films come prepackaged in cassettes in lengths for producing 12, 20, 24, and 36 frames per roll. Also, 35mm films come in rolls 100 feet long that can be bulk-loaded into reusable cassettes. Sheet Film Sheet or cut film is made in a variety of sizes from 4x5 to 11x14 inches and larger. The most common sizes are 4x5 and 8x10 inches. Most sheet film has no paper backing and must be loaded into and removed from film holders in the darkroom in total darkness or under the appropriate safelight. Eastman Kodak does market the Kodak Readyload Packets that provide two sheets of film in a paper packet. These packets can be loaded into a Kodak Readyload Packet film holder or a Polaroid film holder, Model 545. The Kodak Readyload Packets are available only in 4x5 format. Most sheet films have reference notches in one edge of the film. In the dark, this allows identification of the film type and the emulsion side of the film. Every film type has a different notch code (fig. 2-5). The emulsion side of the film is toward you when the notches are along the top edge in the upper right-hand corner, or on the bottom right edge in the lower right-hand corner of the film (fig. 2-6). For those sheet films that do not have notches, the emulsion side of the film can be identified under a safelight. The emulsion side is lighter in color than the base side. If the emulsion side of the film must be identified in total darkness, wet your lips and place the edge of the film between them. The emulsion side of the film will stick to one of your moistened lips. FLOPPY DISKS Although the floppy disks used in electronic imagery are not light sensitive, they are, however, a commonly used image-recording medium. All floppy disks are the same. There are no black-and-white and color floppy disks. The camera and the printer being used determine whether the image is black and white or color. Images are stored as magnetic impulses on compact 2-inch still-video floppy disks. The pictures are recorded on tracks on a still-video floppy disk. Each picture is recorded either as a FRAME or FIELD (the frame or field mode is selected on the camera). When the frame mode is selected, each picture is recorded on two tracks. Twenty-five images can be recorded on a floppy disk in the frame mode. When the field mode is selected, each picture is recorded on one track In the field mode, 50 images can be stored on each disk. The result of using one track per photograph is the images are less detailed than those recorded on two tracks (frame mode). The quality of the frame-recorded image is superior to that of the field-recorded photograph. A combination of field and frame images can be stored on the same disk; however, for higher quality use the frame mode. Sound can also be recorded on a floppy disk. Sound is not recorded on the same track as the image. It is recorded right after the image is recorded. The sound 2-8