Choosing the right focal length is a crucial part of the creative decision making process for a photographer. You can have the best camera for beginners, but if you don't truly understand focal length, you'll struggle to pick the right lens for the right situation.
Focal length is used to determine your lens's angle of view, which is what you see when you look through your camera's viewfinder. The angle of view is measured from the point where rays of light converge within a lens (the point of convergence) to the camera's sensor (or film) and is calculated while the focus is set to infinity.
