Many Canon EOS cameras come with a built-in pop-up flash, but while this is a convenient way to add a blip of light, they’re not powerful. A Speedlite gives greater range, but being anchored to your camera limits your options. By taking your Speedlite off-camera it enables you to light subjects from any angle for more creative lighting.
Being able to liberate the light from the hotshoe for off-camera effects is great, and being able to control multiple lights from one unit is better. There are two types of wireless trigger – optical and radio-frequency. The former requires a direct line of sight from the camera, has a limited range and is affected by bright sunlight. The latter has a greater range, can travel through solid objects and is unaffected by
