What Is Focal Length In Photography
In photography, we use focal length as a primary descriptor of lenses. It’s the measure (in millimeters) of the distance between the rear nodal point and the focal point of the lens, while the lens is focused to infinity. Yep, that’s quite a mouthful, so let’s break it down. How Focal Length Works The purpose of a photographic lens is to take parallel rays of light and converge them into a single point of focus so they can be recorded, either on a piece of film or, far more commonly, with a digital sensor....