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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

   Camera lenses often include an adjustable diaphragm, which changes the size of the aperture stop and thus the entrance pupil size. This allows the user to vary the f-number as needed. The entrance pupil diameter is not necessarily equal to the aperture stop diameter, because of the magnifying effect of lens elements in front of the aperture.

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. Lenses for SLR and DSLR cameras - Wikipedia

   en.wikipedia.org/.../Lenses_for_SLR_and_DSLR_cameras

   A "slow" lens (one that is not capable of passing a lot of light through) might have a maximum aperture from 5.6 to 11, while a "fast" lens (one that can pass more light through) might have a maximum aperture from 1 to 4. Fast lenses are, by definition, larger than slow lenses (for comparable focal length), and typically cost more. [2]

6. 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.

7. The best budget telephoto lenses for Canon, Nikon, Sony and ...

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