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  3. Tokina - Wikipedia

    en.wikipedia.org/wiki/Tokina

    Tokina 135 mm f /2.8 lens on an Olympus Digital body Zoom. AT-X 107 DX AF fisheye 10–17 mm f /3.5–4.5 (available with and without the built-in hood. No hood version can be used on full-frame. The lens is also sold under Pentax brand.) AT-X 116 PRO DX AF 11–16 mm f /2.8; AT-X PRO SD 11–20 mm f /2.8 (IF) DX

  4. APS-C - Wikipedia

    en.wikipedia.org/wiki/APS-C

    Several third-party lens manufacturers, such as Tamron, Tokina, and Sigma, also manufacture a range of lenses optimised for APS-C sensors. Canon Canon EF-S lens is compatible with Canon's APS-C digital SLRs. Canon introduced the Canon EF-S line of lenses in 2003 alongside the 300D.

  5. Fisheye lens - Wikipedia

    en.wikipedia.org/wiki/Fisheye_lens

    Nikon AF-S Fisheye Nikkor 8–15 mm f /3.5–4.5 E ED – designed for full-frame and FX cameras, this lens behaves identically to the Canon. Tokina AT-X AF DX = Pentax DA ED IF 10–17 mm f /3.4–4.5 – a fisheye zoom lens designed for APS-C sensor cameras, also sold as an NH version without integrated lens hood: then, it is usable on full ...

  6. History of photographic lens design - Wikipedia

    en.wikipedia.org/wiki/History_of_photographic...

    The modern lens aperture markings of f-numbers in geometric sequence of f/1, 1.4, 2, 2.8, 4, 5.6, 8, 11, 16, 22, 32, 45, 64, 90, etc. was standardized in 1949. Previously, this British system competed with the Continental (German) sequence of f/1.1, 1.6, 2.2, 3.2, 4.5, 6.3, 9, 12.5, 18, 25, 36, 50, 71, 100 ratios.

  7. Kenko (company) - Wikipedia

    en.wikipedia.org/wiki/Kenko_(company)

    Lenses. For current Kenko teleconverters and lens extension rings see List of Nikon compatible lenses with integrated autofocus-motor (note that Canon EF versions also exist). See also. Canon Extender EF; Nikon F-mount teleconverter; Tokina; List of Kenko teleconverters with Nikon F-mount; Formatt Hitech; References

  8. Olympus Corporation - Wikipedia

    en.wikipedia.org/wiki/Olympus_Corporation

    Olympus Pen FT and 38mm f1.8 Zuiko lens Olympus OM Zuiko Lenses. The Pen system design team, led by Yoshihisa Maitani, later created the OM system, a full-frame professional 35mm SLR system designed to compete with Nikon and Canon's bestsellers. The OM system introduced a new trend towards more compact cameras and lenses, being much smaller ...