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Confusion always results when users of Canon EOS camera tries to use the various modes available without trying to understand how they work. This is because the Canon EOS Camera has different modes like AV (Aperture Priority), TV (Shutter Priority), Program (P) and Manual (M) mode to handle its operations. The differences in they way they handle flash illumination is more obvious especially when the ambient light is low. This guide will give you a brief rundown on the various modes so that you will have a better understanding. We are also assuming that the FP mode of the camera is not turn on.

This guide will seek to provide you with an explanation of the various concepts and terms which are used which respect to Canon EOS flash photography.

Before deciding to use Non canon non dedicated flashes with Canon EOS cameras, you will need to be aware of its trigger voltage. Canon Speedlites flashes uses no more than 6 volts in their trigger circuits. As such you have to ensure that the non canon Flashes should also comply within this tolerance. The Canon EOS cameras like the EOS-1,A2/A2E,10s,630,Elan,RT and Rebel are all designed to operate with no more than 6 volts passing through their trigger circuits.