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2. Sony FE 100-400mm F4.5-5.6 GM OSS - Wikipedia

   en.wikipedia.org/wiki/Sony_FE_100-400mm_F4.5-5.6...

   The Sony FE 100-400mm F4.5-5.6 GM OSS is a premium, variable maximum aperture full-frame telephoto zoom lens for the Sony E-mount, announced by Sony on April 19, 2017. [ 1 ] [ 2 ] The FE 100-400mm GM lens is currently the second longest focal length native zoom lens offered for the Sony E-mount, only surpassed by the Sony 200-600mm G lens.

3. f-number - Wikipedia

   en.wikipedia.org/wiki/F-number

   An example of the use of f-numbers in photography is the sunny 16 rule: an approximately correct exposure will be obtained on a sunny day by using an aperture of f /16 and the shutter speed closest to the reciprocal of the ISO speed of the film; for example, using ISO 200 film, an aperture of f /16 and a shutter speed of 1 ⁄ 200 second. The f ...

4. Sony FE 200-600mm F5.6-6.3 G OSS - Wikipedia

   en.wikipedia.org/wiki/Sony_FE_200-600mm_F5.6-6.3...

   The Sony FE 200-600mm F5.6-6.3 G OSS is a premium, variable maximum aperture full-frame telephoto zoom lens for the Sony E-mount, announced by Sony on June 11, 2019. [1] [2]The Sony 200-600mm lens is currently the longest focal length native zoom lens offered for the Sony E-mount.

5. Sony FE 70-200mm F2.8 GM OSS - Wikipedia

   en.wikipedia.org/wiki/Sony_FE_70-200mm_F2.8_GM_OSS

   The Sony FE 70-200mm F2.8 GM OSS is a premium, constant maximum aperture full-frame (FE) telephoto zoom lens for the Sony E-mount, announced by Sony on February 3, 2016. [ 1 ] [ 2 ] The 70-200mm f/2.8 lens is popular among event photographers and photojournalists where the lower light capabilities are required.

6. Telephoto lens - Wikipedia

   en.wikipedia.org/wiki/Telephoto_lens

   A telephoto lens, also known as telelens, is a specific type of a long-focus lens used in photography and cinematography, in which the physical length of the lens is shorter than the focal length. [ 1 ] : 93 This is achieved by incorporating a special lens group known as a telephoto group that extends the light path to create a long-focus lens ...

7. Photographic lens design - Wikipedia

   en.wikipedia.org/wiki/Photographic_lens_design

   Very-large-aperture lenses designed to be useful in very low light conditions with apertures ranging from f/1.2 to f/0.9 are generally restricted to lenses of standard focal length because of the size and weight problems that would be encountered in telephoto lenses and the difficulty of building a very wide aperture wide angle lens with the ...