Certified Professional Photographer (CPP) Practice Exam

Using a crop sensor multiplier of 1.5 with a 200mm lens gives the equivalent of which lens length?

1. 150mm

2. 200mm

3. 300mm

4. 400mm

The correct answer is: 300mm

When using a crop sensor camera, the crop factor must be taken into account to determine the equivalent focal length in relation to a full-frame sensor. A crop sensor with a multiplier of 1.5 means that the effective field of view will be narrower than that of a full-frame camera. To find the equivalent focal length when using a 200mm lens on a camera with a 1.5 crop factor, you multiply the focal length of the lens by the crop factor: 200mm × 1.5 = 300mm This calculation shows that when using a 200mm lens on a camera with a 1.5 crop sensor multiplier, it effectively provides the field of view of a 300mm lens on a full-frame camera. Thus, the equivalent lens length is 300mm.