Olympus released the Olympus-Auto electro-set (1958) and Auto-B electro-set (1959) shortly after the Ace interchangeable lens rangefinder, using styling largely borrowed from the Ace. Both of the Auto models had built-in exposure meters, and were distinguished by lens speed; the older Auto had the faster G. Zuiko 42mm f/1. 8 lens carried over from the 35 S-II and the Auto-B had a slower E. Zuiko 42mm f/2. 8 lens. Cosmetically, the Auto had a cover for the meter window, which was omitted on the Auto-B. :25–28 The 'electro-set' designates the semi-automated exposure system; by setting the film speed on the camera body, match-needle metering is used to set aperture and shutter speed simultaneously. The aperture and shutter speed settings are coaxial with the lens and are geared to turn together when the shutter speed is changed; the aperture may be varied, but the shutter speed will change with aperture to maintain exposure. The Auto Eye of 1960 succeeded the older electro-set models and added full shutter-priority autoexposure using a non-interchangeable version of the D. Zuiko 45mm f/2. 8 from the Ace. :29–30 The camera will not release the shutter if the correct exposure cannot be set based on the selected shutter speed. A slightly faster D. Zuiko 43mm f/2. 5 was used for its successor, the Auto Eye II, released in 1962. :31–32
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