2. What would a photographer need to know in order to know a lens' effective focal length on a camera with a cropped sensor? 3. The hair light, when used as a proper accent light, does its job best when it is positioned 6. When photographing a subject’s face in a two-thirds portrait view, which of the following head positions is correct? 8. Why are flat diffusers used on a meter? 13. The f-stops serve two purposes - what are they? 23. What are “equivalent exposures”? 26. The shutter speeds serve two purposes - what are they? 28. The most precise method of calibrating a computer monitor is by 31. During an environmental session using natural light, the subject has good catchlights in the eyes, but flat lighting on the face. The best way to improve this situation would be to use a