135 film

135 film. The film is 35 mm (1.4 in) wide. Each image is 36×24 mm in the most common "full-frame" format (sometimes called "double-frame" for its relationship to the "single frame" 35 mm movie format).

The term 135 (ISO 1007) was introduced by Kodak in 1934 as a designation for cartridge film 35 mm (1.4 in) wide, specifically for still photography. 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 828, 126, 110, and APS, it remains so today.

135 camera film always comes perforated with Kodak Standard perforations. This effectively eliminates such films from being "diverted" to professional 35mm uses, where Bell & Howell perforations are standard. 135 camera film (negative or reversal), if passed through a 35mm professional motion picture camera, will pass undamaged, but it will not pass with the expected and required registration accuracy for such professional uses.

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.

Characteristics

Cassette

ISO 400 Fuji 135 colour film

Individual rolls of 135 film are enclosed in single-spool, light-tight, metal cassettes to allow cameras to be loaded in daylight. The film is clipped or taped to a spool and exits via a slot lined with flocking. The end of the film is cut on one side to form a leader. It has the same dimensions and perforation pitch as 35 mm movie print film (also called "long pitch", whereas 35mm professional motion picture camera films are always "short pitch").

Ordinarily, the film must be rewound before the camera can be opened. Some motorized cameras unwind the film fully upon loading and then expose the images in reverse order, returning the film to the cassette; this protects exposed film except the one or two last images, should the camera back be accidentally opened. In disposables, the film is also fully unwound at start and exposing the images returns the film to the cassette.

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; this film speed is standardised by ISO. As of today, common film speeds for consumers are ISO 100/21° through ISO 800/30°, although films with more or less sensitivity are available for professional use.

Image format

135 frame and perforations

Image formats on 35 mm film are generally 24 mm wide, between the perforations in the 35 mm wide film. The common "full-frame" image size is 24×36 mm.

Other image formats are also used, such as the half-frame format of 18×24 mm that earned some popularity in the 1960s, and the 24×24 mm of the Robot cameras or some cameras from Agfa (Iso-Rapid). The successful range of Olympus Pen cameras with the smaller half-frame size allowed a very compact pocket-sized camera.

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 1967, the Soviet KMZ factory introduced a 24×58 mm panoramic format with its Horizont camera (descendants of which are called, in the Roman alphabet, Horizon). In 1998, Hasselblad and Fuji introduced a 24×65 mm panoramic format with the XPan/TX-1 camera. There is also a 21×14 mm format used by Tessina subminiature camera.

The perforation size and pitch are according to the standard specification KS-1870. For each full frame, the film advances 8 perforations. This is specified as 1.4960 inches (approximately 38.00 mm). This allows for 2 mm gaps between frames. Each camera model has a different location for the sprocket which advances the film. Therefore each camera model’s frame will vary in position relative to the perforations. The film is approximately 0.14 mm thick.

Length

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 favour 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 and 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 disposable cameras, or used by insurance adjusters to document damage claims. Photographers who load their own cassettes can use any length of film – with thinner film base 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.

History

Earliest 35 mm still cameras

The 35 mm film standard for motion picture film was established in Thomas Edison's lab by William Kennedy Laurie Dickson. Mr. Dickson took 70 mm film stock supplied by George Eastman's Eastman Kodak Company. The 70 mm film was cut lengthwise into two equal width (35 mm) strips, spliced together end to end, and then perforated along both edges. The original picture size was 18 x 24 mm, which in modern times is considered to be a "half-frame" format for still photography. There were four perforations on each side of a motion picture frame.

While the Leica camera popularized the format (see below), there were a number of 35 mm still cameras using perforated movie film before its introduction in the 1920s. The first patent for one was issued to Leo, Audobard and Baradat in England in 1908. The first full scale production camera was the Homeos, a stereo camera, produced by Jules Richard in 1913. It took stereo pairs, 18x24 mm, with two Tessar lenses, and was sold until 1920.

The first big-selling 35 mm still camera was the American Tourist Multiple, which also appeared in 1913, at a cost of $175 (at today's prices, the same cost as a modern $3000 Leica.) The first camera to take full frame 24x36 mm exposures seems to be the Simplex, introduced in the U.S. in 1914. It took either 800 half frame or 400 full frame shots on 50 ft (15.2 m) rolls.

The Minigraph, by Levy-Roth of Berlin, another half frame small camera was sold in Germany in 1915. The patent for the Debrie Sept camera, a combination 35 mm still and movie camera was issued in 1918, but was not marketed until 1922.

Finally, the Furet camera (made and sold in France in 1923) took full frame 24x36 mm negatives and was the first cheap small 35 mm camera to look vaguely like today's models.

Leicas

The Leica camera designed by Oskar Barnack used 35 mm film, and proved that a format as small as 24 mm × 36 mm was suitable for professional photography.

Although Barnack designed his prototype camera around 1913, the first experimental production run of ur-Leicas (Serial No. 100 to 130) did not take place until 1923. Full scale production of the Leica did not begin until 1925. While by that time there were at least a dozen other 35 mm cameras available, the Leica was a success, and came to be associated with the format. The success of the Leica was attributed by contemporary photographic writers not only to the quality of its lens, its small size, and the precision of its construction, but also to its relatively high price, which established it as a "prestige" item amongst both photographers and people of fashion.

Pre loaded cassettes and Kodak Retina cameras

Kodak Retina II

In the earliest days, the photographer had to load the film into reusable cassettes and, at least for some cameras, cut the film leader. In 1934, Kodak introduced a 135 daylight-loading single-use cassette. This cassette was engineered so that it could be used in both Leica and Zeiss Ikon Contax cameras along with the camera for which it was invented, namely the Kodak Retina camera. The Retina camera and this daylight loading cassette were the invention of Dr. August Nagel of the Kodak AG Dr. Nagel Werk in Stuttgart. Kodak bought Dr. August Nagel's company in December, 1931, and began marketing the Kodak Retina in the summer of 1934. The first Kodak Retina camera was a Typ 117. The 35 mm Kodak Retina camera line remained in production until 1969. Kodak also introduced a line of American made cameras that were simpler and more economical than the Retina. Argus, too, made a long lived range of 35mm cameras; notably the Argus C3. Kodak launched 135-format Kodachrome color film in 1935. AGFA followed with the introduction of Agfacolor-Neu in 1936.

The designations 235 and 435 refer to 35 mm film in daylight-loading spools, that could be loaded into Leica or Contax style reusable cassettes without need of a darkroom. The 335 was a daylight loading spool for the 24 × 23 mm stereo format.

The reflex camera

Nikon F – an early SLR system camera

The first 35 mm Single-lens reflex camera (SLR) was the Kine Exakta, introduced in 1936. World War II interrupted development of the type. After the war, Exakta resumed development and the Contax S model with the now familiar pentaprism viewing feature was introduced in 1949. In the 1950s, the SLR also began to be produced in Japan by such companies as Asahi and Miranda. Nikon's F model, introduced in March 1959, was a system camera that greatly improved the quality and utility of 35 mm format cameras, encouraging professionals (especially photojournalists) to switch from larger format cameras to the versatile, rugged, and fast SLR design. Numerous other film formats waxed and waned in popularity, but by the 1970s, interchangeable-lens SLR cameras and smaller rangefinders, from expensive Leicas to "point-and-shoot" pocket cameras, were all using 35 mm film, and manufacturers had proliferated.

Colour films improved, both for print negatives and reversal slides, while black-and-white films offered smoother grain and faster speeds than previously available. Since 35 mm was preferred by both amateur and professional photographers, makers of film stock have long offered the widest range of different film speeds and types in the format. The DX film-speed encoding system was introduced in the 1980s, as were single-use cameras pre-loaded with 35 mm film and using plastic lenses of reasonable enough quality to produce acceptable snapshots. Automated all-in-one processing and printing machines made 35 mm developing easier and less expensive, so that quality colour prints became available not only from photographic specialty stores, but also from supermarkets, drugstores, and big box retailers, often in less than an hour.

1990s–today

In 1996, a new format called Advanced Photo System (APS) was introduced by a consortium of photography companies in an attempt to supersede 135 film. Due in part to its small negative size, APS was not taken seriously as a professional format, despite the production of APS SLRs. In the point-and-shoot markets at which the format was primarily aimed, it enjoyed moderate initial success, but still never rivalled the market penetration of 135. Within five years of its launch, cheap digital compacts started becoming widely available, and APS sales plummeted.

Nikon F6 – a recent film-based pro camera

Such digital compacts have also inevitably eroded the market for 35 mm compact cameras. However, digital SLRs at a price (and quality) comparable with consumer-level 35 mm SLRs are a more recent phenomenon. Most of these use so-called "APS-C" sized sensors, approximately 16×24 mm in size. A handful of digital SLRs use "full frame" sensors, being 24×36 mm like 135 film. While film sales have declined dramatically as digital cameras have become more popular for still photography, 35 mm remains the most popular format for those who use film.

While they have shifted the vast majority of their product lines to digital, major camera manufacturers such as Canon and Nikon continue to make expensive professional-grade 35 mm film SLRs (such as the Canon EOS-1v and the Nikon F6). However, as of 2010, Canon no longer lists the EOS-1v on their US website, indicating that it may be discontinued. This would mark the end of an era for Canon EOS film cameras. Introductory 35 mm SLRs, compact film point-and-shoot cameras, and single-use cameras continue to be built and sold by a number of makers. Leica finally introduced the digital Leica M8 rangefinder in 2007, but continues to make its M series rangefinder cameras and lenses. A digital camera back for the Leica R9 SLR camera was discontinued in 2007. On March 25, 2009, Leica discontinued the R9 SLR and R-series lenses.

See also

• 35 mm film for the use in motion pictures.

External links

Media related to 135 film at Wikimedia Commons