How do you create a believable catchlight when using a single key light?

• A. Use a blue reflector to create a catchlight in the pupil only.
• B. Position the light slightly above and in front of the subject, angle to create a visible catchlight in the eyes; ensure the catchlight shape matches the light modifier.
• C. Place the light behind the subject directly at eye level to create symmetrical catchlights.
• D. Increase ISO to make catchlights more pronounced.

Answer: (B)

Catchlights happen when the eyes reflect the light source, so the position and shape of that reflection tell the viewer where the light is coming from and add life to the eyes. With a single key light, place the light slightly above and in front of the subject and angle it toward the eyes. This puts a visible catchlight in both eyes and keeps the highlight in the upper part of the iris, which looks natural and flattering. The shape of the catchlight should match the light modifier you’re using—softboxes produce a soft, defined shape similar to the modifier, while a bare bulb or reflector will reflect a different shape.

The other ideas don’t work well for a believable look. A blue reflector or any color would tint the catchlight unnaturally and doesn’t control position the way the actual light source does. Putting the light behind the subject creates backlight, not a catchlight in the eyes. And simply cranking up ISO changes exposure, not the physical reflection and placement of the light in the eyes.