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2. 35 mm equivalent focal length - Wikipedia

   en.wikipedia.org/wiki/35_mm_equivalent_focal_length

   35 mm equivalent focal lengths are calculated by multiplying the actual focal length of the lens by the crop factor of the sensor. Typical crop factors are 1.26× – 1.29× for Canon (1.35× for Sigma "H") APS-H format, 1.5× for Nikon APS-C ("DX") format (also used by Sony, Pentax, Fuji, Samsung and others), 1.6× for Canon APS-C format, 2× for Micro Four Thirds format, 2.7× for 1-inch ...

3. List of Sony E-mount lenses - Wikipedia

   en.wikipedia.org/wiki/List_of_Sony_E-mount_lenses

   Sony Lens Adapter E/A 1 2010 Mount adapter APS-C 110g LA-EA1 for A-mount lenses on E-mount camera, glass-less, CD-AF / OS-PD-AF with SSM/SAM lenses only. Sony Lens Adapter E/A 2 2011 Mount adapter APS-C 200g LA-EA2 for A-mount lenses on E-mount camera, SLT-PD-AF with all AF lenses. Sony Lens Adapter E/A 3 2013 Mount adapter 35mm 110g LA-EA3

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. Though designed for Sony's full frame E-mount cameras, the lens ...

5. Sony FE 24-70mm F2.8 GM - Wikipedia

   en.wikipedia.org/wiki/Sony_FE_24-70mm_F2.8_GM

   The Sony FE 24-70mm F2.8 GM is a premium constant maximum aperture full-frame (FE) zoom lens for the Sony E-mount, announced by Sony on February 3, 2016. [1] [2]Though designed for Sony's full frame E-mount cameras, the lens can be used on Sony's APS-C E-mount camera bodies, with an equivalent full-frame field-of-view of 36-105mm.

6. B4-mount - Wikipedia

   en.wikipedia.org/wiki/B4-mount

   The B4-mount is used by practically all 2/3" broadcast lenses and cameras (as of 2019). Although the standard was set in 1992, the B4 mount already existed before 1980. The Sony BVP-300, produced from 1978, was possibly the first camera with a B4 mount. Further, all Sony Betacam cameras had a B4 mount. [2]

7. 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.

8. Sony E 55-210mm F4.5-6.3 OSS - Wikipedia

   en.wikipedia.org/wiki/Sony_E_55-210mm_F4.5-6.3_OSS

   The Sony E 55-210mm F4.5-6.3 OSS is a variable maximum aperture telephoto zoom lens for the Sony E-mount, released by Sony on August 24, 2011. The lens is sometimes bundled with various Sony Alpha mirrorless cameras along with the Sony 16-50mm kit lens. [2] [3]

9. Lenses for SLR and DSLR cameras - Wikipedia

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

   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]