Photographer's Note

The Pentax Auto 110 and Pentax Auto 110 Super were single-lens reflex cameras made by Asahi Pentax that used Kodak's 110 film cartridge. The Auto 110 was introduced with three interchangeable lenses in 1978. Three more lenses in introduced in 1981, and then the Super model was released in 1982. 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) and was made to some professional SLR standards of quality.
Auto 110

Asahi Pentax Auto 110The Pentax Auto 110 featured fully automatic exposure, with no user-settable exposure compensation or adjustments. Metering was TTL (through-the-lens) and center-weighted. Unlike 35 mm SLRs, the system's lenses did not have a built-in iris to control the aperture. Instead, an iris was mounted inside the camera body, and functioned as both an aperture control and a shutter. This mechanism was capable of programmed exposures between 1/750 second at f/13.5; and 1 second at F/2.8. To ensure that minimal light travelling past the diaphragm blades could not get through to the film over time, the camera's mirror system also functioned as a light-tight seal when in the viewing and focusing position. Since the iris was 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, resulted in the 24mm lens being the 'normal' focal length, while lenses of wider angles or longer focal lengths were larger.

The camera detected the film speed by the presence or absence of a ridge on the cartridge, as specified in the Kodak 110 film standard. Since there was no official specification of what the film speeds should actually bethey were just "low" and "high"film and camera manufacturers had to decide for themselves the meaning. Pentax chose 100 and 400 ISO as their settings. A film with a 200 ISO speed would result in either under-or-over-exposure. The exposure latitude of the then existing color print films was 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, more recently produced 110 film is rated at 400 ISO, but is packaged with the ridge indicating 100 ISO. This ridge must be removed 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.

The camera was offered in a special edition "Safari" model, identical to the Auto 110 except for the brown-and-tan color scheme.
From the Wikipedia.

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