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  1. Focal length - Wikipedia

    • The focal length of an optical system is a measure of how strongly the system converges or diverges light; it is the inverse of the system's optical power. A positive focal length indicates that a system converges light, while a negative focal length indicates that the system diverges light. A system with a shorter focal length bends the rays more sharply, bringing the… See more

    Thin lens approximation

    For a thin lens in air, the focal length is the distance from the center of the lens to the principal foci (or focal points) of the lens. For a converging lens (for example a convex lens), the focal length is positive and is the d… See more

    General optical systems

    For a thick lens (one which has a non-negligible thickness), or an imaging system consisting of several lenses or mirrors (e.g. a photographic lens or a telescope), there are several related concepts that are referred to as focal len… See more

     
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  2. 35 mm equivalent focal length - Wikipedia

     
  3. Focal length - Simple English Wikipedia, the free encyclopedia

  4. 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), …

  5. What Is Focal Length in Photography? A Beginner’s Guide

  6. 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.

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  7. 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.

  8. 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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  9. What is focal length in photography? | Digital Camera World

  10. Angle of view (photography) - Wikipedia

  11. What is Focal Length in Photography? Understanding Lenses

  12. What is Focal Length in Photography? - PetaPixel

  13. Understanding Focal Length Terminology - AYRN

  14. Understanding lenses: A beginner’s guide to focal length

  15. Prime lens - Wikipedia

  16. What is Focal Length in Photography? - Camera Jabber

  17. focal length | OptoWiki Knowledge Base

  18. Long-focus lens - Wikipedia

  19. Category:Focal length - Wikimedia Commons

  20. f-number - Wikipedia