How many minutes can I shoot a roll of Super 8mm bifilm?

In p>1965, Super 8 came out, and the film type was Kodachrome II Type A, which was the same size as 8 mm. The biggest difference was that the hole of 8 mm was horizontal, and the hole of Super 8 was thin and straight (see the above picture), so more space could be made for painting, and the painting of the latter was 5% larger than that of the former. The film is wrapped in a black plastic square box, which is convenient for loading. Even in the daytime, as long as the film is not exposed to fierce sunlight, the film will not be exposed. The length of each roll of film is 5 feet. Since the standard shooting speed of Super 8 is 18 fps (that is, 18 frames per second), a roll of film can be shot for 3 minutes and 2 seconds. (* Note: each roll of film has the following words on its packaging: 5 ft (15m). Many people mistakenly think that the film is 5 feet long and can shoot for 15 minutes. In fact, m stands for meters, not minutes.) Ektasound cartridge was released in 73. There is a magic stripe posted next to the film, which must be used in a super-8 camera that can record. Most of the eight films with sound use 24 fps as the film speed, so the sound will be pleasant, so a roll of film can only be shot for 2 minutes and 4 seconds. Other sound-making methods include magnetic coating-coating magic oxide on the edge of the developed film, and then recording narration on a recordable projector; Tape pasting-Tape pasting on film by magic striper ... The decline/revival of Super 8; The 197s was the golden age of Super 8, and in 1978, there were as many as 38 types of Super 8 films on the market; however, the appearance of video in the mid-198s made the number of people who beat Super 8 drop continuously, and video has undergone many "changes" for more than ten years. Around 1996, Kodak stopped producing Super 8 audio films, and Super 8 players only had two colors and two kinds of black and white films to choose from. The news that Kodak completely stopped producing Super 8 films came out from time to time … but in the past one or two years, Super 8 has somehow recovered. Especially in the United States: many music videos are also shot in super 8, such as Jim Jarmusch's documentary "Year of the Horse" for Neil Young. "Bangkok Dangerous" filmed by the Peng brothers in Thailand and "Brother" filmed in Yan Yan Mak also used Super 8, and some photographers made their own web pages to teach people to shoot Super 8 on the Internet. Ebay became the most important auction place for Super 8 photographic equipment ... And Kodak actually made Vision 2, a film used for commercial film shooting, into Super 8 format last year, which proved that Kodak had no intention to completely ban Super 8 and actively provided new choices for photographers. Useful webpage:. geocities/super8mmgroup/

I remember it seems to be 2 minutes, so it's set for 3 minutes, because it was used nearly 2 years ago.