Exposure and Focusing
The most important thing that digital photography has in common with film-based photography is a need to record pictures that are both correctly exposed and accurately focused. This chapter reviews these requirements in more detail than previously and also recaps some of the general principles that apply as there appears to be declining knowledge in this area. Nevertheless, this chapter is still not the whole story as far as focusing is concerned and readers should consult the technical chapter on optical quality (Chapter 15) to appreciate the finer details of some of the technical limitations that apply to digital photography.
In film photography there were two schools of thought regarding exposure. One proposed ...