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35 mm equivalent focal length - Wikipedia
Focal length - Simple English Wikipedia, the free encyclopedia
Lens - Wikipedia
A lens is a transmissive optical device that focuses or disperses a light beam by means of refraction. A simple lens consists of a single piece of transparent material, while a compound lens consists of several simple lenses (elements), …
What Is Focal Length in Photography? A Beginner’s Guide
What is Focal Length and Angle of View in …
The simplest focal length definition is a description of the distance between the center of a lens and the image sensor when the lens is focused at infinity.
What is Focal Length in Photography? - How-To Geek
May 30, 2018 · 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.
Understanding Focal Length - Nikon USA
Focal length controls the angle of view and magnification of a photograph. Learn when to use Nikon zoom and prime lenses to best capture your subject.
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Understanding lenses: A beginner’s guide to focal length
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