The digital Spectra professional IV meter was introduced in May 1992 at the American Society Of Cinematographers Club House. It measures Foot-candles, Lux and F/stops - the key unit of measurement used in Cinematography and Television applications.
The Spectra Professional IV-A measures incident and reflected light directly in -stops, footcandles or lux and instantly calculates the f/stop difference, contrast ratio and average of your particular lighting situation. The multiple channel memory enables you to recall the stored measurement, current measurement, f/stop difference, contrast ratio and average. The meter covers a sensitivity range of almost one-million to one.
This makes the hand-held incident meter a kind of insurance policy that eliminates second-guessing and gambling with exposure control, especially under the more difficult and extraordinary light conditions that are apt to confront the serious photographer.
The Spectra Professional IV-A has a Digital f-stop measuring range that extends from f/0.24 to f/128 in 1/10-stop increments and the Analog Bargraph range from f/0.7 to f/45 in 1/3-stop increments. Both are displayed simultaneously on a backlit liquid crystal display, along with film-speed, frames per second for cine use or exposure time for still photography.
Insert this dimmer on any line up to 1000 watts to adjust brightness on special lamps.
Edison U-Ground plugs.