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A standard Hollywood movie averages about five 2,000-foot reels in length. The "reel" was established as a standard measurement because of considerations in printing motion picture film at a film laboratory, for shipping (especially the film case sizes) and for the size of the physical film magazine attached to the motion picture projector.
The first commonly available increase in tape length resulted from a reduction in backing thickness from 1.5 to 1.0 mil (38 to 25 μm) resulting in a total thickness reduction from 42 to 35 μm (1.7 to 1.4 mils), which allowed 3,600 ft (1,100 m), 1,800 ft (550 m), and 900 ft (270 m) tapes to fit on ten-and-a-half-, seven-, and five-inch reels respectively.
A reel of half-inch magnetic tape being loaded onto an IBM 729 tape drive that is attached to an IBM 1401 being restored at the Computer History Museum. IBM 's first magnetic-tape data storage devices, introduced in 1952, use what is now generally known as 7-track tape.
The feed and takeup reels are held vertically on the axis, except behind the projector, on oversized spools with 12,000-foot (3,700 m) capacity or about 133 minutes at 24 frame/s. This large capacity alleviates the need for a changeover on an average-length feature; all of the reels are spliced together into one giant one.
This translates into about 5 megabytes to 140 megabytes per standard length (2,400 ft, 730 m) reel of tape. Effective density also increased as the interblock gap (inter-record gap) decreased from a nominal 3 ⁄ 4 inch (19 mm) on 7-track tape reel to a nominal 0.30 inches (7.6 mm) on a 6250 bpi [clarification needed] 9-track tape reel. [12]
Depending on the manufacturing processes and camera equipment, lengths can vary anywhere from 25 to 2000 feet. Common lengths include 25 feet for 8 mm, 50 feet for Super 8 , 100 and 400 feet for 16 mm, 400 and 1000 feet for 35 mm, and 1000 for 65/70 mm.
The standard also specifies position and placement of the cue marks at the end of the reel. Either by 1992 or 2000, the name of the leader was changed from "Universal Leader" to "Television Leader." The latest overall length of both styles is the same: in 35mm, 16 feet and 4 frames or 260 frames.
These were scenes from feature-length films generally edited to fit onto a 200 ft (61 m) reel that ran 8–9 minutes. Also popular were theatrical cartoons which could fit on the 200-foot reels without being edited.
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