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Most cameras now set the speed film automatically using DX coded film cassettes, but if there’s a dial you can usually override. This can be used to uprate a film or adjust to suit your shooting preferences or to bring an out of calibration exposure meter back in line.
A technique used to gain speed with a film. You manually override its ISO speed, using the film speed dial or exposure compensation dial, to make the film more sensitive. To film would then be given longer in the developer.