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  2. Focal length - Wikipedia

    en.wikipedia.org/wiki/Focal_length

    Focal length is a measure of how strongly an optical system converges or diverges light. For a thin lens in air, the focal length is the distance from the center of the lens to the principal foci. Learn how to measure and calculate focal length for different types of lenses and systems.

  3. Camera lens - Wikipedia

    en.wikipedia.org/wiki/Camera_lens

    Learn about the theory, construction, and types of camera lenses, which are optical lenses or assemblies used with cameras to make images. Find out how lens elements, coatings, materials, and design affect lens performance and resolution.

  4. Photographic lens design - Wikipedia

    en.wikipedia.org/wiki/Photographic_lens_design

    Zoom lenses - variable focal length lenses. Zoom lenses cover a range of focal lengths by utilising movable elements within the barrel of the lens assembly. In early varifocal lens lenses, the focus also shifted as the lens focal length was changed. Varifocal lenses are also used in many modern autofocus cameras as the lenses are cheaper and ...

  5. How to pick a lens for your mirrorless camera in 2019 - Engadget

    www.engadget.com/2019-04-15-mirrorless-camera...

    If you'd rather use an F-mount lens with an adapter, I'd recommend the more expensive 24-70mm f/2.8 L II lens over the 24-105mm f/4.0 L II lens. Sure, it's a good $500 more than the f/4.0 model.

  6. Zoom lens - Wikipedia

    en.wikipedia.org/wiki/Zoom_lens

    A zoom lens is a camera lens that can vary its focal length and angle of view, unlike a fixed-focal-length lens (prime lens). Learn about the types, advantages, disadvantages, and history of zoom lenses in photography, video, and astronomy.

  7. 35 mm equivalent focal length - Wikipedia

    en.wikipedia.org/wiki/35_mm_equivalent_focal_length

    Learn how to calculate the angle of view of a lens-sensor combination based on the 35 mm film format. Find out the crop factors, conversion formulas and examples for different sensor sizes and aspect ratios.

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