Metering system
Metering systems
1. traditional metering inside a camera without electric or electronic exposure control
A selenium cell and an electromechanical instrument are combined. A glass plate with multilens surface bundles light onto the cell. The instrument, the meter, shows with its needle a) a number, or b) its needle moves around a single mark.
- a) A simple analog calculator will help to find an appropriate shutter-speed/aperture combination manually. The ASA speed of the film must be preselected on the calculation slice, then the number given by the meter transferred to that slice. Then all combinations of shutter speed and aperture shown on the calculation slice can be selected for correct exposure.
- b) In this case the meter is coupled with the ASA preselector, the aperture selector and the shutter speed selector. If the meter's needle matches the mark the combination of selection is appropriate.
