Asahi Pentax Auto 110 жүйесі: 110 пленкаға арналған ультра кішкентай SLR камералар

Single lens reflex camera made by Asahi Pentax that use Kodak's 110 film cartridge

The Pentax Auto 110 and Pentax Auto 110 Super were fully automatic single lens reflex cameras manufactured by Asahi Pentax for use with Kodak 110 film cartridges. The Auto 110 was introduced with three interchangeable, fixed focal length lenses in 1978. A further three lenses (including one zoom lens) were added in 1981 to coincide with the release of the Auto 110 Super the following year. The camera system was sold until 1985. The complete system is sometimes known as the Pentax System 10, apparently for its official Pentax name, although most Pentax advertising only uses the camera name or Pentax 110. This model represented the only complete ultraminiature SLR system manufactured for the 110 film format, although several fixed lens 110 SLRs were sold. The camera system also claims to be the smallest interchangeable lens SLR system ever created. The cameras and lenses were very small (the camera fits in the palm of a hand easily).

The Pentax Auto 110 features fully automatic exposure, with no user settable exposure compensation or adjustments. Metering is TTL (through the lens) and center weighted. Unlike 35 mm SLRs, the system's lenses do not have a built in iris to control the aperture. Instead, an iris is mounted inside the camera body, and functions as both an aperture control and a shutter. This mechanism is capable of programmed exposures between 1/750 s at f/13.5; and 1 s at f/2.8. To ensure that light travelling past the diaphragm blades could not get through to the film over time, the camera's mirror system also functions as a light tight seal when in the viewing and focusing position. Since the iris is part of the camera, all of the system's lenses had to be constructed with an f/2.8 aperture. The lens' designs, based upon the film dimensions, result in the 24 mm lens being the 'normal' focal length (i. e. equivalent angle of view to a 50 mm lens on a 135 format camera), while lenses of wider angles or longer focal lengths were larger.

The camera detects the film speed by the presence or absence of a ridge on the cartridge, as specified in the Kodak 110 film standard. Since there is no official specification of what the film speeds should actually be—they were just "low" and "high"—film and camera manufacturers had to decide for themselves the meaning. Pentax chose ISO 80 and 320 as their settings, but commercially available films at ISO 100 and 400 are close enough to work in practice. A film with an ISO 200 speed would result in either under or over exposure. The exposure latitude of color print films is about 2 f/stops (meaning that a photographer could expose either 2 f/stops under or 2 f/stops over the exposure set by the camera). Unfortunately, some recently produced 110 film is rated at ISO 400, but is packaged with the ridge indicating "low". If this is the case, the ridge must be removed (by filing or cutting with a sharp blade) for the camera to expose correctly. Since only a few 110 cameras ever supported the ISO auto selection, this does not affect the majority of cameras using the format but does affect the Pentax Auto 110. In 2012/2013 ISO 100 film has been produced and marketed under the Lomography label, and gives excellent results, without the need to modify the cartridge casing. The camera was offered in a special edition "Safari" model, identical to the Auto 110 except for the brown and tan color scheme.

Introduced in late 1982, the Super is identical in basic shape and size to the previous model and accepts the same lenses. Many improvements and changes were included to make this model arguably a better camera than the previous Auto 110. Film winding is improved with a single stroke film advance lever that advances the film and cocks the shutter in one winding (the Auto 110 takes two strokes to advance the film). A switch around the shutter release button enables a new ten second self timer mode and a shutter lock; the self timer activates a red light on the pentaprism housing, which flashes during the 10 second shutter release count down. A button on the front on the user's left hand side gives a +1.5 EV (exposure value) backlit scene exposure compensation. The optional winder offers an improved battery cover, a well known weak component in the Auto 110. The shutter button is protected from accidental tripping by an altered casing around the button. The flash synchronization socket cover on the Super is permanently attached to the camera in an attempt to prevent loss, though many still get lost when the plastic tether breaks. The viewfinder screen has a split image rangefinder center, surrounded by a microprism collar, whereas the Auto 110 has the split image rangefinder center only. The low light warning activates at 1/45 s (the Auto 110 activates at 1/30 s).

Two models of motor winder were produced. The original 110 Winder took 2 AA batteries and could wind through 100 cartridges of 110 film with one set of batteries. It works only in single shot mode. It takes about 1.5 s to wind a frame. The 110 Winder II, introduced in 1982, adds a continuous shooting mode and improves the battery cover door, which was fragile on the original.

A custom electronic flash unit, the AF130P, was part of the original Auto 110 system, and was produced until the camera ceased being manufactured. Pentax responded to criticism that this electronic flash unit was too large by introducing the smaller AF100P electronic flash unit in 1980. This unit, however, was never part of the Pentax camera kits and became rare.

Pentax produced a range of various camera carrying cases and also a belt clip for the cameras.