Lesson #2 in Photography for Ignorant Geniuses
Find earlier photography lessons here.
Lenses
At the very basic level, a lens is what controls and directs light onto the camera’s sensor. Lenses are usually named and defined by their focal length in millimeters. Focal length affects two major aspects of photography: magnification and composition (through field of view). Do not worry if you’re lost – the aim of this lesson is to explain how these will affect your pictures.