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2. Wide-angle lens - Wikipedia

   en.wikipedia.org/wiki/Wide-angle_lens

   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, 18, and 14 mm

3. Angle of view (photography) - Wikipedia

   en.wikipedia.org/wiki/Angle_of_view_(photography)

   Ultra wide angle lens is a rectilinear which is less than 24 mm of focal length in 35 mm film format, here 14 mm gives 114° and 24 mm gives 84° . Wide-angle lenses (24–35 mm in 35 mm film format) cover between 84° and 64° Normal, or Standard lenses (36–60 mm in 35 mm film format) cover between 62° and 40°

4. Camera lens - Wikipedia

   en.wikipedia.org/wiki/Camera_lens

   Normal lens: angle of view of the diagonal about 50° and a focal length approximately equal to the image diagonal. Wide-angle lens: angle of view wider than 60° and focal length shorter than normal. Long-focus lens: any lens with a focal length longer than the diagonal measure of the film or sensor. [10] Angle of view is narrower.

5. Perspective distortion - Wikipedia

   en.wikipedia.org/wiki/Perspective_distortion

   Extension or wide-angle distortion can be seen in images shot from close using a wide-angle lens (with an angle of view wider than a normal lens). Objects close to the lens appear abnormally large relative to more distant objects, and distant objects appear abnormally small and hence farther away – distances are extended.

6. Normal lens - Wikipedia

   en.wikipedia.org/wiki/Normal_lens

   A normal lens typically has an angle of view that is close to one radian (~57.296˚) of the optical system's image circle. [citation needed] For 135 format (24 x 36 mm), with an escribed image circle diameter equal to the diagonal of the frame (43.266 mm), the focal length that has an angle of one radian of the inscribed circle is 39.6 mm; the focal length that has an angle of one radian of ...

7. Lenses for SLR and DSLR cameras - Wikipedia

   en.wikipedia.org/wiki/Lenses_for_SLR_and_DSLR...

   Conversely, the same lens can produce different fields of view when mounted on different cameras. For example, a 35 mm lens mounted on a full-frame Canon EOS 5D provides a slightly wide-angle view, while the same lens mounted on an APS-C Canon EOS 400D provides a "normal" or slightly telephoto view.