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Chapter Two Shapes and Measurements of Films

What are the measurements or .

Image sizes for known film formats?

The measurement of the image produced by different cameras differs greatly, even when it is said that these cameras produce images in standard formats. This is in order to take into account the tolerance of workmanship as well as the small amount around the edges which is obscured by the frame of the negative holders and color film photo slides From this we conclude that the actual measurement could vary by about a few millimeters

The nominal measurements of the 120 rolled film shapes are explained in the following question. Other standard roll film sizes (Fig. 7) are 127 (8 pics nominally 25.7.4 cm (2.1/4 1.5/8 in.) or 12 pics 2.4 cm (1.5/8 in.) 828 square (photos, 43 cm (1/8" x 1 5/8"). The nominal size for photos from a roll of 126 film is 28 mm (1/8 1 inch) square and from a roll of 110: 13 by 17 cm) + x in. The nominal size for a 35 mm tire is 24 36 cm (1 x + 1 in) and for a half rim, 18 24 mm (1 x 1 in)..

Why are there numbers on the 120-inch roll film backing sheet?
Although all 120-gauge roll film is of standard nominal length (620-gauge film is actually the same except on a thinner spool), cameras that accommodate this film size vary greatly in size, such as the number of pictures they take. These cameras are produced by scrolling film

The three rows up to the numbers on the backing paper are numbered 8, 12, and 16, respectively. The first cameras using this size of roll film produced eight images measuring 976 cm (approximately 4 by 2 by 3 inches), but long before that there were much smaller formats that yielded twice as many half-size negatives (16 x 5.4 cm (about 2 x 15 inches) and eventually settled on a medium size, 12 confined 6 x 6 cm over | 2 inches). This size became the common model with the advent of dual-lens reflex cameras (Fig. 7).

To roll the film from frame to frame, the back of the camera contains a small window protected by transparent colored celluloid (which was originally green and later turned red when fast films appeared) and based on the number of images that the camera produces from the film roll, it may This window is placed in a place where we can see the correct numbers. Some cameras can accommodate more than one image size - this is achieved by installing or sliding the inner curtains. The cameras that accommodate (8 or 16 photos on one roll) contain two windows at the bottom of one end from the back, and they used one only when it was necessary to obtain the eight largest photos. When I wanted to get 16 photos, the number 1 was wrapped On the first window, then the exposure process took place, and for the second picture, the number 1 was wrapped on the second window, and so on.
And when the system of temporarily moving the film appeared, in which the film is presented at the correct amount by the arm designated for that, the numbers on the backing paper became almost unnecessary, except for the old photocopiers. Modern photocopiers now give ten pictures measuring 6 x 7 cm or 12 6x6cm photo or 15 6x5.4cm photos using 120-gauge film rolls. As for cameras measuring 620, they are no longer in use today, including the famous Kodak Browni 620 camera, which is one of the box cameras that were common in the late fifties of the twentieth century.