Easily my favourite lighting technique.
Strong sunlight can produce harsh lighting and a cloudy day the lighting can be flat.
When the light comes from two opposite directions it can be both soft and give the subject that 3D effect.
When it happens naturally the results can be stunning. Good luck with that one!
When it does not happen naturally the easiest way to do this is to take your subject out of the strong sunlight and put them in the shade of a tree, with the background in full sun and bounce the light back in onto your subject or use flash.
Where there is no sun light, 2 flash guns or 1 flash and a reflector, can be used either side of the subject.
With only 1 key light, there are not lots of unnatural key lights in people’s eyes.
