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2. Sigma 120-400mm f/4.5-5.6 DG OS HSM lens - Wikipedia

   en.wikipedia.org/wiki/Sigma_120-400mm_f/4.5-5.6...

   The Sigma APO 120-400mm F4.5-5.6 DG OS HSM lens is a super-telephoto lens produced by Sigma Corporation. It contains three SLD (Special Low Dispersion) glass elements to provide correction for chromatic aberration. It is aimed toward advanced consumers.

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

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

   At launch it was the widest rectilinear lens available for full-frame 35mm SLR cameras, providing a field of view of 122 degrees. It has since been surpassed by the Canon EF 11-24mm f/4L zoom lens and the Irix 11mm f/4, a manual focus prime lens. [2] The Sigma 12-24 has low distortion even compared to less wide zooms like the Canon EF 16-35mm ...

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

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

   The sequence of lens designations may differ in literature. See also full list of Nikon designations, Sigma designations, Tamron designations and Tokina designations.. Nikon AF-S/Sigma HSM/Tamron USD or PZD: The lens contains an integrated ultrasonic focus motor based on piezoelectricity, which enables quiet or low noise autofocus operation.

5. Sigma 150-500mm f/5-6.3 DG OS HSM lens - Wikipedia

   en.wikipedia.org/wiki/Sigma_150-500mm_f/5-6.3_DG...

   In 2010, Sigma recalled some lenses due to a "potential autofocus defect". Sigma offered customers a modification service, free of charge. Lenses requiring the modification were those with serial numbers between 10674301 and 10972000. Sigma lenses APO 50-500mm F4.5-6.3 DG OS HSM and APO 120-400mm F4.5-5.6 DG OS HSM were also affected. [2]

6. Sigma Corporation - Wikipedia

   en.wikipedia.org/wiki/Sigma_Corporation

   Sigma Corporation (株式会社シグマ, Kabushiki-gaisha Shiguma) is a Japanese company, manufacturing cameras, lenses, flashes and other photographic accessories. All Sigma products are produced in the company's own Aizu factory in Bandai , Fukushima , Japan .

7. Sigma 50-500mm f/4-6.3 DG lens - Wikipedia

   en.wikipedia.org/wiki/Sigma_50-500mm_f/4-6.3_DG_lens

   The Sigma 50-500mm f / 4-6.3 EX DG HSM is a super-telephoto zoom lens produced by Sigma Corporation. It contains four SLD (Special Low Dispersion) glass elements to provide correction for chromatic aberration. It is aimed at advanced consumers.