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2. Wide-angle lens - Wikipedia

   en.wikipedia.org/wiki/Wide-angle_lens

   Also by custom, a lens of focal length 35 mm or less is considered wide-angle. Ultra wide angle lenses have a focal length shorter than the short side of the film or sensor [citation needed]. In 35 mm, an ultra wide-angle lens has a focal length shorter than 24 mm. Common wide-angle lenses for a full-frame 35 mm camera are 35, 28, 24, 21, 20 ...

3. Micro Four Thirds system - Wikipedia

   en.wikipedia.org/wiki/Micro_Four_Thirds_system

   When compared to a full frame camera lens providing a similar angle of view, rather than weighing a few kilograms (several pounds) and generally having a length exceeding 60 cm (24 in) end to end, the optically stabilized Panasonic Lumix G Vario 100–300 mm lens weighs just 520 g (18 oz), is only 126 mm (5.0 in) long, and uses a relatively ...

4. Ultra wide angle lens - Wikipedia

   en.wikipedia.org/wiki/Ultra_wide_angle_lens

   An ultra wide-angle lens is a lens whose focal length is shorter than that of an average wide-angle lens, providing an even wider view. The term denotes a different range of lenses, relative to the size of the sensor in the camera in question. [1] For 1" any 9mm or shorter is considered ultra wide angle. For 4/3" any 10 mm or shorter lens is ...

5. History of photographic lens design - Wikipedia

   en.wikipedia.org/wiki/History_of_photographic...

   It was the first super-wide angle zoom lens for still cameras (most 35mm SLRs). Previously, combining the complexities of rectilinear super-wide angle lenses, retrofocus lenses and zoom lenses seemed impossible. The Sigma's all-moving eleven element/seven group/three cell formula was a triumph of computer-aided design and multicoating. [114]

6. Lens mount - Wikipedia

   en.wikipedia.org/wiki/Lens_mount

   Lens mount. A lens mount is an interface – mechanical and often also electrical – between a photographic camera body and a lens. It is a feature of camera systems where the body allows interchangeable lenses, most usually the rangefinder camera, single lens reflex type, single lens mirrorless type or any movie camera of 16 mm or higher gauge.

7. List of Canon camcorders - Wikipedia

   en.wikipedia.org/wiki/List_of_Canon_camcorders

   The XH A1 lens with its three control rings visible. The built-in lens has a focal length of 4.5 mm - 90 mm (equivalent to 32.5 mm - 650 mm for 35 mm), with a maximum f/stop of f/1.6. Canon also includes its image stabilization technology on the camera, the same technology used in many of their Single-lens reflex camera lenses. The lens body ...