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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.
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.
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 ...
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.
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.
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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