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2. Sigma 24mm F1.4 DG HSM Art - Wikipedia

   en.wikipedia.org/wiki/Sigma_24mm_F1.4_DG_HSM_Art

   The Sigma 24mm F1.4 DG HSM Art is an interchangeable wide angle lens for full frame cameras. It was announced by Sigma Corporation on February 10, 2015. A full two stops faster than most 24mm primes, it is designed to capture wide angle imagery with shallow depth of field, as one might with a medium or large format camera.

3. Sigma 24mm f/1.8 EX DG lens - Wikipedia

   en.wikipedia.org/wiki/Sigma_24mm_f/1.8_EX_DG_lens

   The Sigma 24mm f/1.8 EX DG is wide-angle lens which features a fast f/1.8 maximum aperture for use in low-light situations, and macro focusing capability to a ...

4. List of Nikon F-mount lenses with integrated autofocus motor

   en.wikipedia.org/wiki/List_of_Nikon_F-mount...

   Nikon AF-S Nikkor 24mm f / 1.4G ED; Nikon AF-S Nikkor 24mm f / 1.8G ED; Nikon AF-S Nikkor 28mm f / 1.8G; Nikon AF-S Nikkor 28mm f / 1.4E ED; Nikon AF-S Nikkor 50mm f / 1.4G back showing eight electrical contacts. Typical AF-S lenses have 7–10 contacts (with VR: 10) increased from about five contacts from AF or AF-D lenses. [1]

5. Sigma 12-24mm f/4.5-5.6 lens - Wikipedia

   en.wikipedia.org/wiki/Sigma_12-24mm_f/4.5-5.6_lens

   The Sigma 12-24mm f/4.5-5.6 EX DG HSM is a professional-level wide-angle zoom lens made by Sigma Corporation. [1] At launch it was the widest rectilinear lens available for full-frame 35mm SLR cameras, providing a field of view of 122 degrees.

6. Sigma Corporation - Wikipedia

   en.wikipedia.org/wiki/Sigma_Corporation

   Sigma has made a number of film SLR cameras, including the SA-300, SA-5, SA-7 and SA-9. Up until the Sigma FP, [7] all Sigma SLR, DSLR, and mirrorless cameras used the Sigma SA mount, which is mechanically similar to the Pentax K mount and electrically an adaptation of the Canon EF lens mount lens control system.

7. Four Thirds system - Wikipedia

   en.wikipedia.org/wiki/Four_Thirds_system

   Four Thirds logo. The Four Thirds System is a standard created by Olympus and Eastman Kodak for digital single-lens reflex camera (DSLR) design and development. [1] Four Thirds refers to both the size of the image sensor (4/3") as well as the aspect ratio (4:3).