How much is a 35mm film now? How long can a roll of film last? What's the difference between film and camera film?

Generally, it is 122 m and 305 m, and there is 122 m, such as Kodak Vision3 250D. I have seen 1 100 yuan-1500 yuan.

1 min 35mm film needs more than 27m film, and a film takes about 4.4 minutes.

Movies are mostly negative and rarely positive. Generally, in order to cope with high-speed filming, the back is coated with carbon black to prevent static electricity.

Therefore, instead of the traditional C4 1 process, ECN-2 process is used for cleaning, which basically means an extra step of removing the carbon black layer, using a small nozzle and spraying high-pressure water to wash off the carbon black layer.

Usually, in order to adapt to various scenes, the film is much wider than ordinary negatives and digital cameras. For example, Kodak's Vision3 250D has a latitude of 15 from -6 to +8 (if you count 0EV, 15 is not 14). Generally, the top-grade civil black-and-white film known for its tolerance is -3 to +4.

Of course, there are some exceptions. For example, Kodak has 5222 (double X) black and white film, and there is no carbon black layer. Kodak 100D film has no carbon black layer, and it is processed with E-6, which is the same as ordinary reverse film, but with a slightly higher tolerance.