Control circuit and display for electronic flash unit - has digital processor and digital display of film speed and exposure settings

摘要

A digital processor (17) is linked to a digital display (38) and controlled by the information input controls. The user sets the film speed and one of the exposure factors and the digital unit calculates and displays the other factor in a digital read-out. The digital processor is connected into the exposure control circuit and can be linked to an automatic range finder (48). It provides a fail-safe indication of the exposure conditions without the user having to read a scale.