110 is a cartridge-based film format used in still photography. It was introduced by Kodak in 1972. 110 is essentially a miniaturised version of Kodak's earlier 126 film format. Each frame is 13 mm × 17 mm (0.51 in × 0.67 in), with one registration hole.
The film is fully housed in a plastic cartridge, which also registers the image when the film is advanced. There is a continuous backing paper, and the frame number and film type are visible through a window at the rear of the cartridge. The film does not need to be rewound and is very simple to load and unload. It is pre-exposed with frame lines and numbers, a feature intended to make it easier and more efficient for photofinishers to print.
The 110 cartridge was introduced by Kodak in 1972 with Kodak Pocket Instamatic cameras. The new pocket-sized cameras became immediately popular, and soon displaced competing subminiature cameras, such as the Minolta 16 series, from the market. The 110 film width is 16 mm. A four frame strip measures 111 mm.
Estes Industries has long marketed several model rockets, the most notable being the Astrocam, with a simple 110 camera in the nose; the shutter is triggered when the nose cone separates from the rocket body.
Although the format is most closely associated with cheaply produced, low-cost cameras, Canon, Minolta, Minox, Pentax, Rollei, Voigtländer, and others, as well as Kodak, offered sophisticated, expensive 110 cameras, with excellent multi-element focusing lenses and precise, electronically controlled exposure systems. Such cameras are capable of making high-quality images on 110 film. Some of these cameras are quite small and still hold appeal to subminiature-photography enthusiasts.
The small negative size of 110 film makes it difficult to enlarge successfully. For these reasons, the 110 format is associated with prints that are often rather grainy and unsharp. This has led to the misconception that the cartridge itself is incapable of holding film flat enough for making high-quality negatives.
The 110 cartridge, as specified by Kodak, has a plastic tab on one end. Camera designers had the option of using this tab to sense film speed, enabling sophisticated cameras to switch between high- and low-speed film. A short tab indicated high-speed film, and a long tab indicated low-speed film. Kodak left it to the film manufacturer to decide which film speeds were high or low. Only a few cameras took advantage of this feature: Rollei A110, Canon 110 ED, Minolta 110 Zoom SLR Mark I/II, Minox 110S, Pentax Auto 110.
The last 110 film that Kodak produced was ISO 400 speed packed in a cartridge that senses as "low" speed. As shown in the photograph to the right, these cartridges can be modified by hand so that they signal the proper speed to the camera.
Although the format is commonly associated with print film, Kodak also produced Kodachrome 110 slide film until 1982. In 2012 Lomography re-introduced slide film for 110 with their Peacock 200 ASA model. However, since all 110 cameras do not have a settable ASA dial (low or high, depending on presence of a notch in the cassette), a ND filter has to be used over the lens or the exposure compensation dial has to be used wher available. Otherwise, over-exposure by a factor of x2 will result, leading to over-exposed negatives.
Along with standard sized slides that fit into standard projectors, 110 slide film could also be processed into smaller format slides. The latter required special Pocket Carousel projectors. or the Leica 110 projector. The sub-miniature slides were mounted in small mounts, or for Kodachrome mounted in 35mm sized mounts with a 110 frame. There were also mount adapters available that allowed the small mounts to be projected in a common 35mm projector from gepe. These adapters were not entirely satisfactory however, as to project the smaller slide at a size comparable to that from 35mm the projector had to be moved further from the screen, resulting in a dimmer image. Dedicated 110 projectors overcame this by using a brighter lamp.
Kodak's Verichrome-Pan was the only 110 black and white film produced until 2012, when Lomography manufactured their new Black and White Orca film at 100 ISO speed. This speed is supported by most 110 cameras. As of 2013, this film is still in production.
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