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2. List of standard zoom lenses - Wikipedia

   en.wikipedia.org/wiki/List_of_standard_zoom_lenses

   There is no precise definition of the term, but lenses marketed as "standard zoom" usually cover a range of at least 30mm to 70mm in terms of 35mm equivalent focal length with an optical zoom ratio of 2.5× (e.g. 28-70mm) to 5× (e.g. 24-120mm) — the most common being 3× (e.g. 24-70mm). [1]

3. Lenses for SLR and DSLR cameras - Wikipedia

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

   [6] A wide-angle lens has a shorter focal length and includes more of the viewed scene than a normal lens; a telephoto lens has a longer focal length and captures a small portion of the scene, making it seem closer. Lenses are not labeled or sold according to their angle of view, but rather by their focal length, usually expressed in millimeters.

4. Wide-angle lens - Wikipedia

   en.wikipedia.org/wiki/Wide-angle_lens

   The 1.5 indicates that the angle of view of a lens on the camera is the same as that of a 1.5 times longer focal length on a 35 mm full-frame camera, which explains why the crop factor is also known as a focal-length multiplier. For example, a 28 mm lens on the DSLR (given a crop factor of 1.5) would produce the angle of view of a 42 mm lens on ...

5. 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 ...

6. List of Sony E-mount lenses - Wikipedia

   en.wikipedia.org/wiki/List_of_Sony_E-mount_lenses

   Focal Length Aperture intro OSS Zeiss/G/ G Master Lens Wgt ⌀ Length Min Focus Mag Filter Size Model Notes 14mm: f / 1.8 2021 No G Master 460g 83mm 99.8mm 0.25m 0.10 N/A SEL-14F18GM Uses gel filters behind the rear element. 20mm: f / 1.8 2020 No G 373g 73.5mm 84.7mm 0.18m 0.22 67mm SEL-20F18G 24mm: f / 1.4 2018 No G Master 445g 75.4mm 92.4mm 0 ...

7. Focal length - Wikipedia

   en.wikipedia.org/wiki/Focal_length

   The focal point F and focal length f of a positive (convex) lens, a negative (concave) lens, a concave mirror, and a convex mirror.. The focal length of an optical system is a measure of how strongly the system converges or diverges light; it is the inverse of the system's optical power.

8. Ricoh GR (large sensor compact camera) - Wikipedia

   en.wikipedia.org/wiki/Ricoh_GR_(large_sensor...

   The Ricoh GR series has been compared against the Nikon Coolpix A and the Fujifilm X70, other large sensor compacts with the same fixed focal length (28mm). Ricoh GR II [ edit ]

9. Angle of view (photography) - Wikipedia

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

   The yellow line shows an example where 18 mm focal length on the 3:2 APS-C image sensor format (1.5 crop factor) is equivalent to 27 mm as the 35 mm format-equivalent focal length (27 mm = 18 mm * 1.5) and yields a vertical angle of 48 degrees.