The term 135 (ISO 1007) was introduced by Kodak in 1934 as a designation for the cassette for 35 mm film, specifically for still photography. It quickly grew in popularity, surpassing 120 film by the late 1960s to become the most popular photographic film size. Despite competition from formats such as 828, 126, 110, and APS, it remains so today.
135 camera film always comes perforated with Kodak Standard perforations.
The size of the 135 film frame has been adopted by many high-end digital single-lens reflex cameras, referred to as full-frame digital SLRs.