Certified Professional Photographer (CPP) Practice Exam

What occurs when film speed increases, according to exposure principles?

1. Less light is required for correct exposure

2. More light is required for correct exposure

3. No change in lighting conditions

4. Greater sharpness in images

The correct answer is: Less light is required for correct exposure

When film speed increases, it indicates a higher sensitivity of the film or sensor to light. This increase means that the medium can capture the same level of exposure with less light. For instance, if a film or sensor is rated with a higher ISO number, it requires significantly less light to achieve the same exposure compared to a lower ISO setting. This is especially beneficial in low-light conditions, allowing for proper exposure without the need for additional lighting. The reduction in the amount of light needed translates to more versatility in various shooting situations, such as in dimly lit environments or when capturing fast-moving subjects without motion blur. This principle is vital for photographers as it directly influences their ability to achieve desired effects and exposure settings in different lighting scenarios.