Using an 8x10-inch copy camera, with an 8-inch lens and 16-inch bellows
extension, what is the multiplying factor to obtain the correct exposure?
Multiplying factor = (bellows extension )2
2-26. SUMMARY: You have now completed lesson 2 of the subcourse. This lesson
has dealt with the basic optics, to include lens characteristics, focal plane,
focal length, lens performance factors, plus some general practical camera lens
data. This lesson was designed to give you a general knowledge about optical
functions and some of the applications in general photography. You will have
to apply the knowledges gained in this lesson to a number of tasks required of
you in your job as an 84B.