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Japanese medium-format VF and RF (edit)
6×9 Fujica G690/GL690 | Fujica GW690/GSW690 | Mamiya Press | Marshal Press
6×8 Fujica GW680/GSW680
6×7 Fujifilm GF670 | Fujica GM670 | Fujica GW670 | Koni-Omega | Makina 67 | Mamiya 7
6×6 Mamiya 6
4.5×6 Bronica RF645 | Fujifilm GA645 | Fujifilm GA645i | Fujifilm GA645W | Fujifilm GA645Wi | Fujifilm GA645Zi | Fujica GS645 / GS645S / GS645W
Japanese medium format SLR and TLR ->
Other Japanese 6×6, 4.5×6, 3×4 and 4×4 ->

The Koni-Omega is a class of medium format rangefinder cameras. These press cameras are 6×7cm (2 1/4" × 2 3/4") rangefinders with a combined viewfinder and coupled rangefinder, and automatic parallax and field-of-view compensation. Some cameras have fixed lenses while others have interchangeable lenses. Still others have interchangeable backs. All cameras use medium format roll film. Not including the military cameras (e.g., PH-501/PF) the first camera in what would later become the Koni-Omega system was released in 1954, and the Rapid Omega 100 ended production in 1981. Despite having American origins these cameras were produced in Japan for most of their production run.

Camera details

The Simmon Brothers, known for their line of enlargers, built the original Simmon Omega. The Omega 120 camera was design by Alfred Simmon.[1] The designs of later cameras were likely by Berkely Brothers and Konica. The product was principally by Konica.

There are ten 6×7cm exposures to a roll of 120 film and 20 to 220 film roll. However, the 220 film backs are less common than the 120 backs. All cameras have interchangeable film backs, thus allowing the photographer to prepare additional loaded backs while the camera is in use. The Koni-Omega Rapid M, Koni-Omega M, Koni-Omegaflex M and Rapid Omega 200 also feature fully-enclosed film magazines that allow for mid-roll film exchange. The film advance is via a pull-push operation on a handle on the side of the camera. This makes for fast advancing, and along with the ability to quickly load new film magazines this explains the use of the name Rapid.

The lenses are focused by a large knob above the film advance. The entire lens mount moves in and out with a rack-and-pinion system. The bright-line framing in the rangefinder is determined by the focus and one or more pins protruding from the rear of the lens. There is a large grip on the other side of the camera near the shutter release. No light meter is included in these cameras. All cameras allow both M and X flash synchronization.

The cameras with enclosed film magazines require a dark slide to change lenses or film backs. The cameras with film backs include an integrated internal baffle curtain that must be closed to change lenses. In both cases these systems are part of an interlock system that prevents the shutter from being fired with either a dark slide in place or if the curtain is closed. Due to the exposed linkage between the winder and the lens shutter, double exposures are possible with all cameras, but accidental double exposures are rare as it requires the photographer to manually cock the shutter using a small lever that is recessed under the lens.

List of models

  • Combat Camera PH-501/PF
  • Omega 120
  • Omega 120 KE-8
  • Koni-Omega Rapid
  • Konica Press
  • Koni-Omega Rapid M
  • Koni-Omega M
  • Konica Press 2
  • Rapid Omega 100
  • Rapid Omega 200
  • Rapid Omega 200 KE-58

List of lenses

Lenses available include:

  • 58mm f/5.6 (eight elements in four groups)[2]
  • 60mm f/5.6 (six elements in four groups)[3]
  • 90mm f/3.5 (four elements in three groups)[2][3]
  • 135mm f/3.5 (six elements in five groups)[3]
  • 180mm f/4.5 (five elements in four groups)[2][3]

The normal lens is a 90mm f/3.5 Tessar with shutter speeds from 1 to 1/500 sec and a minimum aperture of f/32. The 58mm and 60mm wide-angle lenses are widely believed to have the same optical design, but the lens diagrams contained in the user manuals prove this wrong.[4] (One of these, or both, may have an Aviogon or Biogon design.) Framing requires use of an accessory finder. The 135mm lens is less common than the other lenses. The 180mm f/4.5 is roughly equivalent to 100mm for a 35mm camera. It focuses down to 12 feet, close enough for portrait use.



Omega 120 Koni-Omega Rapid Koni-Omega Rapid M Koni-Omega M Rapid Omega 100 Rapid Omega 200
Year 1953 1964 1967 1968 1975
Producer Simmon Konica Mamiya
Film 120 film 120 / 220 roll film
Mid-roll film No Yes No Yes
Frame 90mm, 180mm 90mm, 135mm, 180mm




General links

Repair notes