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  2. Wide-angle lens - Wikipedia

    en.wikipedia.org/wiki/Wide-angle_lens

    Ultra wide angle lenses have a focal length shorter than the short side of the film or sensor [citation needed]. In 35 mm, an ultra wide-angle lens has a focal length shorter than 24 mm. Common wide-angle lenses for a full-frame 35 mm camera are 35, 28, 24, 21, 20, 18, and 14 mm

  3. Lenses for SLR and DSLR cameras - Wikipedia

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

    The maximum aperture for a zoom lens may be the same (constant) for all focal lengths, but it is more common that the maximum aperture is greater at the wide-angle end than at the telephoto end of the zoom range. For example, a 100 mm to 400 mm lens may have a maximum aperture of f/4.0 at the 100 mm end but will diminish to only f/5.6 at the ...

  4. Canon EF-S 10–22mm lens - Wikipedia

    en.wikipedia.org/wiki/Canon_EF-S_10–22mm_lens

    The Canon EF-S 10–22mm f / 3.5–4.5 USM lens is a wide to ultra-wide angle zoom lens for Canon digital single-lens reflex cameras with a Canon EF-S lens mount. [1] The field of view has a 35 mm equivalent focal length of 16–35mm, which is analogous to the EF 16–35mm f / 2.8L on a full-frame camera. The 10–22mm is an internal focusing lens.

  5. Ultra wide angle lens - Wikipedia

    en.wikipedia.org/wiki/Ultra_wide_angle_lens

    An ultra wide-angle lens is a lens whose focal length is shorter than that of an average wide-angle lens, providing an even wider view. The term denotes a different range of lenses, relative to the size of the sensor in the camera in question. [1] For 1" any 9mm or shorter is considered ultra wide angle. For 4/3" any 10 mm or shorter lens is ...

  6. 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]

  7. Photographic lens design - Wikipedia

    en.wikipedia.org/wiki/Photographic_lens_design

    Cross-section of a typical retrofocus wide-angle lens. Extreme or ultra-wide-angle lens - a wide-angle lens with an angle of view above 90 degrees. [4] Extreme-wide-angle lenses share the same issues as ordinary wide-angle lenses but the focal length of such lenses may be so short that there is insufficient physical space in front of the film ...

  8. 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 ...

  9. Canon EF 20-35mm lens - Wikipedia

    en.wikipedia.org/wiki/Canon_EF_20-35mm_lens

    The EF 20–35mm lens is a wide-angle lens made by Canon Inc., with an EF mount. There are two models, an L-series f / 2.8L [1] and a consumer-grade f / 3.5–4.5. [2]