Certified Professional Photographer (CPP) Practice Exam

What is a common disadvantage of zoom lenses compared to fixed focal length lenses?

1. Higher cost

2. Less versatility

3. Variable aperture

4. More weight

The correct answer is: Variable aperture

Variable aperture is a common disadvantage of zoom lenses compared to fixed focal length lenses. Zoom lenses often have a variable aperture, meaning that the maximum aperture can change as you zoom in or out. This can be limiting in scenarios requiring consistent exposure, particularly in lower light conditions, where maintaining a wider aperture may be essential for achieving sufficient light. On the other hand, fixed focal length lenses typically offer a constant maximum aperture throughout their range, allowing for more consistent exposure and depth of field control. This can make fixed lenses preferable for certain types of photography, such as portraiture or low-light scenarios. The other potential disadvantages, such as higher cost, more weight, and less versatility, are context-dependent and do not apply universally to all zoom lenses or all fixed focal length lenses. For instance, many high-quality prime lenses can be quite expensive, and some lightweight zoom lenses are available. Thus, while a variable aperture presents a clear and specific challenge faced when using zoom lenses, the other aspects can vary based on the photographer's requirements and choices.