Certified Professional Photographer (CPP) Practice Exam

What is one of the primary uses of an incident light meter in photography?

1. To determine depth of field

2. To measure ambient light

3. To calculate shutter speed

4. To estimate ISO settings

The correct answer is: To measure ambient light

The primary use of an incident light meter in photography is to measure ambient light. This tool serves to capture the amount of light that is falling onto the subject rather than the light reflected from it, which is what reflected light meters do. By measuring ambient light, photographers can assess the exposure needed to achieve a properly lit image, ensuring that the camera settings are adjusted accordingly for optimal results. Using an incident light meter helps photographers achieve accurate exposure readings regardless of the subject's color or reflectivity, which can sometimes mislead reflected light meters. This capability is particularly valuable in scenarios where consistent and reliable lighting conditions are required, such as in portrait photography or controlled studio settings. Understanding this use of an incident light meter is crucial for photographers aiming to enhance their technical skills and achieve more dynamic and well-exposed images.