Camera magazine
In 16 mm filmmaking, most magazines are designed to accommodate up to 400 feet of film stock, which usually is the longest standard roll size available from film manufacturers (longer rolls can be made upon special request sometimes, but require special magazines).
In 35mm filmmaking, there tend to be three common magazine types - 1000 foot magazines, which accommodate the longest standard roll size of 35 mm film; 400 foot magazines, which are often used when the camera is handheld in order to minimize the amount of weight upon the camera operator; and 400 foot Steadicam magazines, which are specially designed with a pair of moving spindles that gradually change position as the film rolls through the camera in order to maintain a steady center of gravity, which is advantageous for Steadicam operation.
Furthermore, in between these two sides there are always two separate slots or throats where the film exits and then re-enters the magazine.
Therefore, the loading of motion picture film must be done in a dark room or light-tight changing bag by the clapper loader.
The small amount of film which is exposed on the take-up side would not be used for exposure under any design, and thus is not considered a significant loss of stock.
Virtually all magazines are designed for the feed side to contain film stock wound with the emulsion facing inwards, which is the standard manufacturing wind.
Although different regions and types of filmmaking may have variants as to how this is done, generally larger budget feature films follow the following labelling convention: 1000' NR 5219 117 049.01 (27.4) M# 2314 R# C54Where 1000' indicates the amount of film loaded (this can be indicated in meters instead, region depending); NR indicates "new roll" - otherwise it must be SE "short end" or RC "re-can"; 5219 is the manufacturer's stock code (in this case 35 mm Kodak Vision3 500T color negative film); 117 049.01 (27.4) are emulsion code numbers indicating the exact information of what batch of emulsion, printer, and cut the film came from - they are written on the film can and act as a "fingerprint" for the roll; M# 2314 is the serial number of the magazine itself; and R# C54 indicates that this the 54th roll of the "C" Camera.
However, usually this is buffered by additional precautions made to maintain light-tightness, against both fault of equipment and humans.
Cases containing magazines often include an indicator of what is inside through the usage of colored stickers or magnets.
If the magazine is pulled off with the intention of being put back on the camera without the take-up side first being unloaded, then the appropriate colored sticker will be placed on the case, and written with the amount of film left, followed by the word hot (to indicate that it is still in usage).
