Camera with flash attachment - has indication in viewfinder if flash bulb is ready or if illumination is sufficient

摘要

The position of the release lever for th efitted inertially fires flash bulb operates a microswitch. The switch connects a series resistance in a potential divider chain and provides a supply for a LED indicator in the viewfinder. This indicates if the bulb has been fires. The indicator system has a parallel circuit to indicate if there is insufficient illumination when the camera is set for daylight exposure, using the same battery and indicator.