 In the early history plate sizes were often specific for the make and model of camera although there quickly developed some standardisation for the more popular cameras.The introduction of roll film drove the standardization process still further so that by the 1950s only a few standard roll films were in use.These included 120 film providing 8, 12 or 16 exposures, 220 film providing 16 or 24 exposures, 127 film providing 8 or 12 exposures (principally in Brownie cameras) and 135 (35mm film) providing 12, 20 or 36 exposures – or up to 72 exposures in the half-frame format or in bulk cassettes for the Leica Camera range.