Konica EEmatic S
Konica merged with Minolta in 2003 to form Konica Minolta, however, all camera production ceased three years later. Konica has a long history of involvement in the sale and production of photographic products dating back to 1873. Konica is perhaps best known as a producer of high quality 35mm film and photographic paper. They produced numerous rangefinder camera models during the 1960s and 1970s, all of which have a good reputation. The best of these is the converted later model Konica Auto S3 released in 1973. A camera very similar in size and shape to the Minolta Hi-Matic 7sII.
The Konica EEmatic S came out in 1965. EE stands for “Electric Eye.” In this case, it means the earlier selenium light meter around the lens. With this Konica model set to “Auto,However” the meter controls both the aperture and the shutter. However,there is no means by which the photographer can set either. In fact, there is no way to tell which combination of aperture and shutter speed have been selected by the camera for correct exposure of the film. In this respect, you are completely in the dark. If the combination selected by the camera is out of its range because there is either too little, or too much light, the shutter mechanism locks. In which case the yellow spot visible in the viewfinder becomes red.
I found that in use the shutter locks in dim light. This makes the Konica EEmatic S rangefinder camera useless in anything other than broad daylight. I suspect that the shutter locks at 1/30th second or below so as to prevent blurred shots caused by camera shake. However, unlike the Yashica Electro, you cannot use a tripod to take a sharp photograph in low light levels.
The is a sliding switch on the bottom of the lens barrel which has two settings: Auto and Flash. The Auto setting is described above, while the Flash setting sets the aperture to f2.8 and the shutter to 1/30th of a second.
Cameracollector.com has some info here on the Konica EEmatic S
Lens: KONISHIROKU HEXAGON 1:2.8 f=40mm
ASA range 10, 25, 50, 64, 100, 160 and 200.
Size: 126mm x 85mm x 62mm
Flash: Accessory shoe without direct contact. There is a conventional flash socket on the front of the camera.