Certified Professional Photographer (CPP) Practice Exam

What is the purpose of using the Sunny 16 rule when assessing exposure?

1. To determine color balance

2. To find a baseline exposure

3. To measure sensor sensitivity

4. To improve focus accuracy

The correct answer is: To find a baseline exposure

The Sunny 16 rule serves as a guideline for achieving a baseline exposure in bright sunlight conditions. This rule suggests that on a sunny day, if you set your aperture to f/16, you can achieve a correct exposure by matching your shutter speed to the reciprocal of the ISO setting. For example, if you're shooting at ISO 100, your shutter speed should be 1/100 seconds. This method allows photographers to quickly estimate exposure without needing a light meter, making it especially useful in situations where time is of the essence or when outdoors. The other options, while related to photography, do not align with the primary function of the Sunny 16 rule. Determining color balance involves adjusting the color temperature of the light to achieve natural colors, which is not addressed by the Sunny 16 rule. Measuring sensor sensitivity pertains to the ISO setting itself, which the rule utilizes but does not specifically measure. Lastly, improving focus accuracy relates to techniques for ensuring sharp images rather than directly influencing exposure, which is the core focus of the Sunny 16 rule.