Certified Professional Photographer (CPP) Practice Exam

What is the primary function of a light meter in photography?

1. To adjust shutter speed

2. To determine exposure settings

3. To focus on the main subject

4. To measure depth of field

The correct answer is: To determine exposure settings

The primary function of a light meter in photography is to determine exposure settings. A light meter measures the intensity of light in a scene, allowing photographers to calculate the appropriate combination of aperture, shutter speed, and ISO to achieve a well-exposed image. By providing a precise reading of the available light, the light meter helps ensure that the photograph captures details in both highlights and shadows, resulting in a balanced exposure. Using a light meter is crucial, especially in challenging lighting conditions where the right exposure settings may not be immediately apparent. Understanding how to interpret the readings from a light meter equips photographers with the knowledge to make informed adjustments to their cameras, leading to successful photographic outcomes. The other choices focus on elements of the photographic process that are influenced by exposure but do not directly relate to the primary function of a light meter. For instance, while adjusting shutter speed is part of setting exposure, it is just one aspect of a broader process that a light meter helps to facilitate. Similarly, focusing on the main subject and measuring depth of field are important aspects of photography, but they are not functions attributed to the light meter.