1:35 Scale

135 (ISO 1007) is a film format for still photography. Introduced in its modern form in 1934 it quickly grew in popularity, surpassing 120 film by the late 1960s to become the most popular photographic film format. Despite competition from formats such as 110 and APS, it remains so today. more...

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The film itself has the same dimensions (35 mm wide) and perforations (16 per 72 mm) (KS1870) as 35 mm movie print film but is enclosed in a light-tight cassette to allow cameras to be loaded in daylight. The standard image format is 24 × 36 mm. Other image formats are also used, like the half-frame format of 18 × 24 mm that earned some popularity during an era of unusually high film costs in the 1960s and the 24 × 24 mm of the Robot cameras. Odd formats include the 24 × 32 mm and 24 × 34 mm on the early Nikon rangefinders, and 24 × 23 mm for use with some stereo cameras. In 1998, Hasselblad introduced a 24 × 65 mm panoramic format with the XPan camera. There is also a 14 × 21 mm format used by Tessina subminiature camera.

The film is housed in a single spool metal cassette. The film is clipped or taped to a spool and exits via a velvet-covered slot. The end of the film is cut on one side to form a leader, which is to be inserted into a corresponding slot in the camera take-up spool.

The film is available in lengths for varying numbers of exposures. The standard full-length roll has always been 36 exposures (assuming a standard 24 × 36 frame size). Through about 1980, 20 exposure rolls were the only shorter length with widespread availability. Since then, 20 exposure rolls have been largely discontinued in favor of 24 and 12 exposure rolls. With most cameras it's in fact possible to get 3 more exposures than the nominal capacity on the film if the camera is loaded in a darkroom. Some cameras allow this with daylight loading. 27 exposure disposable cameras are loaded in the dark with standard 24 exposure cassette. Other, mostly shorter lengths have been manufactured. There have been some 6, 8, 10, and 15 exposure rolls given away as samples, sometimes in single-use cameras, or used by insurance adjusters to document damage claims. Photographers who load their own cassettes can use any length of film — with thinner emulsions up to 45 exposures will fit.

Ilford at one time made HP5 black and white film on a thin polyester base, which allowed 72 exposures in a single cassette. They produced special reels and tanks to allow this to be processed.

Ordinarily, the film must be rewound before the camera can be opened. Some cameras, particularly disposables, unwind the film fully upon loading and then expose the images in reverse order, returning the film to the cassette. This enables counting of the available exposures and protects exposed film (except the most recent images) should the camera back be accidentally opened.

Since the 1980s, film cassettes have been marked with a DX encoding pattern for automatically setting the camera to use the correct sensitivity value for the film. Different films are sensitive to light at different degrees, and are usually written as a number preceded by "ISO." Common film sensitivies for consumers are ISO100 through ISO800, although films with much greater and much less sensitivity are available, and are generally for professional use.

Read more at Wikipedia.org