The Fujica ST605 is a 35mm SLR made in Japan by Fuji, introduced in c.1976. It has a M42 lens mount - for Praktica/Pentax Screwmount Lenses, a rubberized silk curtain focal plane shutter running from 1/2 to 1/700s. It has an internal light meter requiring two SR44 1.5 batteries.
The Fujica ST605N is an updated ST605 with shutter speed setting shown in the view finder.
The exposure meter of the FUJICA ST605N consists of 2 Silicon photocell light receptors located on either side of the viewfinder eyepiece, which are connected to an FET (Field Effect Transistor) circuit and are coupled with the shutter and diaphragm It measures the average light intensity which falls on the entire surface of the focusing glass In other words. it measures the light that has passed through the lens and will actually reach the film4.butkus.org
Its special features are: high sensitivity, complete accuracy, instantaneous response, and a spectral sensitivity close to that of color film. Other merits are its compatibility with any lens that can be mounted on the camera, and elimination of the necessity of making exposure corrections in taking close-ups and in shooting with a filter on the lens because the light that has passed through the selected aperture is the light that is measured