Why is shooting against the sun called backlit ?
Place the subject between you and the sun. This will light your subject from their back. That’s why the subject is said to be “backlit.”
While shooting backlit, keeping the following in mind :
When the sun is behind the subject, your subject gets rimmed by light. This bright line separates your subject from the background. Since the subject appears to be separate, it also layers your subject in front of the background elements, emphasizing the 3D nature of the world — although the video image itself is a 2D image.
Backlighting also emphasizes your subject’s form. If there is something important about their form that you want to emphasize (pregnancy, cowboy hat, unique nose. etc.), you can use the rim light to emphasize the characteristic. Also, backlighting places their front in shadow which creates a more dramatic look.
Blur the background
Blur out the background behind your subject. To get this effect use a telephoto lens, zoom in on your subject and use a wide aperture (low F stop) so you get a shallow depth of field.
Use a fluid head tripod
It’s possible that your subject won’t stay in one place, so…
Use a fluid-head tripod to follow your subject with a smooth movement. Try to emphasize either tilting up and down, or panning back and forth. Keep the resistance high to get a smooth movement.
Angle of the sun
The best time to do backlighting is when the sun is at a 45 degree angle in the sky. If the sun is too low, the light shines directly into the lens, creating lens flare and reducing the contrast in your image.
If the sun is too high in the sky, the light falls too much on their shoulders and head. Also, it creates deep shadows in the subject’s eyes. This might not be the look you want.