Canon EOS Digital Camera Flash Metering System
Canon EOS Digital Camera Flash Metering System By Tim Harris | December 9, 2008 by Tim Harris When Harold Edgerton invented the modern electronic flash in 1931, the world of photography was revolutionized. The principle behind the electronic flash is that when you charged up a capacitor or condenser and release the energy through a flash light bulb (A glass bulb containing inert gases), a split second burst of light will occur. This output of light occurs instantly when you send power to t