A Photometer for Measuring the Output of Timing Lights

A highly sensitive pulsed-light photometer, which has three stages of solid state amplification, measures the intensity of tiny pulsed-light sources which occur in camera timing markers on high-speed cameras. It measures the relative intensity of a 20-mil diameter pulsed-light spot, but is not affected by direct sunlight. One form of the light probe which fits between the sprocket teeth of a 16mm camera is suitable for checking the reliability of camera timing out on the range. The thin-probe mount which carries only one stage of amplification is connected by a cable to a case containing the other stages, the meter and range switches.