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The Mamiya Ruby Standard is a leaf-shutter fixed-lens rangefinder introduced by Mamiya in August 1961. It features a coupled selenium match-needle lightmeter. The lens is a Mamiya-Kominor 48mm f/2.0 and the shutter is a Copal SVK. This camera was sold in the Unites States by Sears as the Tower 18B.

Technical specifications[]

  • Type: 35mm
  • Released: August 1961
  • Original Price: ¥ 19,500
  • Image size: 24 × 36mm
  • Lens: Mamiya Kominar 48mm f/2.0 (6 elements in 5 groups)
  • Viewfinder: Reverse Galilean viewfinder, automatic parallax correction
    • Focusing: Double image coincidence rangefinder
    • Magnification 0.66
    • Baseline length 31.5mm
    • Effective baseline length 20.8mm
  • Shutter: Copal SVK leaf shutter with self-timer, B + 1 - 1/500
  • Flash Sync: M · X contact (full sync) 
  • Film Advance: Lever (180 degrees)
  • Exposure Metering: Built-in selenium meter with coupled match needle (visible on top only)
  • Size and weight: 80 × 131 × 67mm · 684g


In Japanese: