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Why do certain photographs appeal to us so much while others do little to spark our interest? Sometimes it has to do with our emotional connection to the subject matter, but more often it has to do with human evolution and the way that we see.
Light that comes into a scene off-axis from the camera view will ALWAYS look more dynamic, interesting and pleasing. It looks more three-dimensional, and it creates shadows on textures, shapes and form that enhance the visual appeal of the image.
And aside from that, using the flash off-camera prevents red eye and that horrible “deer in the headlights’ look that straight-on flash usually gives. You probably already know all this, though.
Of course, the main issue with using off-camera flashes is how to trigger them. Essentially, there are five different ways to trigger a remote lighting unit: