The MINOX B PRIVATE EYE model was similar in most respects to the model IIIS cameras. However, these were the first MINOX cameras with a built in coupled light meter to aid in achieving accurate exposure. Before the camera is opened for the purpose of inserting a film cassette, the ASA/ISO index of that particular film is set on the exposure meter by rotating the shutter speed dial until the small marker on the rotating meter dial points to the respective ASA/ISO index on the meter. The camera is then opened, film cassette is inserted, shutter speed set to 1/100 sec., and then the camera is closed. To take an accurately exposed photo, one looks through the camera's viewfinder and while composing the image, the meter button is pressed and released. This allows the meter's needle to move and then lock into position. The camera's shutter speed dial is rotated until the triangular marker is pointing to where the needle is sitting. The exposure is now accurately set.
MINOX B PRIVATE EYE #851 855
MINOX B PRIVATE EYE #812 623
MINOX B BR. ALUMINUM #616 319
MINOX B BR. ALUMINUM #681 287
MINOX B BR. ALUMINUM #915 399
MINOX BL BR. ALUMINUM #1206 943
Although the MINOX BL is partially electronic, it wasn't the first camera in the MINOX line that required a battery. Actually, the MINOX C preceded the BL and the C model was fully automatic with regard to exposure. The BL has an upgraded light metering system that requires power to operate. It is operated in a similar manner to the B model. Unlike the C model and those that came after it, the camera's shutter can be operated whether there is a battery installed or not. The shutter is still mechanical.