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2. Wide-angle lens - Wikipedia

   en.wikipedia.org/wiki/Wide-angle_lens

   For a full-frame 35 mm camera with a 36 mm by 24 mm format, the diagonal measures 43.3 mm, and by custom, the normal lens adopted by most manufacturers is 50 mm. Also by custom, a lens of focal length 35 mm or less is considered wide-angle.

3. Nikon Nikkor Z 14-30 mm f/4 S - Wikipedia

   en.wikipedia.org/wiki/Nikon_Nikkor_Z_14-30_mm_f/4_S

   The Nikon Nikkor Z 14-30 mm f /4 S is a full-frame wide-angle zoom lens with a constant aperture of f /4, manufactured by Nikon for use on Nikon Z-mount mirrorless cameras. Introduction [ edit ]

4. List of Sony E-mount lenses - Wikipedia

   en.wikipedia.org/wiki/List_of_Sony_E-mount_lenses

   for A-mount lenses on full-frame E-mount camera, glass-less, CD-AF / OS-PD-AF with SSM/SAM lenses only. [63] Sony Lens Adapter E/A 4 2013 Mount adapter 35mm 160g LA-EA4 for A-mount lenses on full-frame E-mount camera, SLT-PD-AF with all AF lenses. [63] Sony Lens Adapter E/A 5 2020 Mount adapter 35mm 88g LA-EA5

5. Venus Optics - Wikipedia

   en.wikipedia.org/wiki/Venus_Optics

   Laowa 9 mm f/2.8 super wide angle lens for APS-C, introduced in 2015 Laowa 25 mm 2.5-5x ultra macro lens for full frame, introduced in 2018. The first lens was the 60 mm f/2.8 2 x Ultra Macro, a full frame lens with a magnification factor of 2:1 that could also be focused to infinity which is unique. [8]

6. Fisheye lens - Wikipedia

   en.wikipedia.org/wiki/Fisheye_lens

   Pentax F 17–28 mm f /3.5–4.5 Fisheye – This lens was born for 35 mm full frame film cameras, to take the place of the 16 mm f/2.8 in the AF era. It starts from a 17 mm full-frame (diagonal) fisheye. When it reaches 28 mm, the fisheye effect is almost gone, leaving an overdistorted wideangle image. It was intended as a "special effect ...

7. 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 ...