4
In this chapter
- Lenses & Focal Length
- Focal Length & Digital Cameras
- Autofocus & Manual Focus
- Controlling Depth of Field
The Importance
of Lenses
Good photographers know their cameras and how they work. This
chapter explains the science behind the most important part of that
equipment: lenses. The more you know how to work with lenses, the
better a photographer you will be. Fortunately, even beginners have
been exposed to what this chapter covers:
■Focal length.You probably have heard the numbers surround-
ing lenses, such as a 28mm lens and a 400mm lens. You might
have heard the terms wide-angleand telephotoused instead of
these numbers.■Aperture and depth of field. Open the lens to f2.8 and see
depth of field disappear.