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2. 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.

3. Chromatic aberration - Wikipedia

   en.wikipedia.org/wiki/Chromatic_aberration

   Telephoto lenses using diffractive elements to minimize chromatic aberration are commercially available from Canon and Nikon for interchangeable-lens cameras; these include 800mm f/6.3, 500mm f/5.6, and 300mm f/4 models by Nikon (branded as "phase fresnel" or PF), and 800mm f/11, 600mm f/11, and 400mm f/4 models by Canon (branded as ...

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

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

   The Sigma APO 150-500mm F5-6.3 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 consumer level photographers, and is available in Nikon, Canon, Pentax and Sigma camera mounts.

5. Optical glass - Wikipedia

   en.wikipedia.org/wiki/Optical_glass

   Optical glass refers to a quality of glass suitable for the manufacture of optical systems such as optical lenses, prisms or mirrors.Unlike window glass or crystal, whose formula is adapted to the desired aesthetic effect, optical glass contains additives designed to modify certain optical or mechanical properties of the glass: refractive index, dispersion, transmittance, thermal expansion and ...

6. List of third-party Sony E-mount lenses - Wikipedia

   en.wikipedia.org/wiki/List_of_third-party_Sony_E...

   8mm T3.1 Cine UMC FISH-EYE II Cine Lens [351] 8mm T3.8 VDSLR UMC Fish-eye CS II Cine Lens [352] 10mm T3.1 VDSLR ED AS NCS CS II Cine Lens [353] 12mm T2.2 Cine NCS CS Cine Lens [354] 16mm T2.2 VDSLR ED AS UMC CS II Cine Lens [355] 21mm T1.5 ED AS UMC CS Cine Lens [356] 35mm T1.3 AS UMC CS Cine Lens [357] 50mm T1.3 AS UMC CS Cine Lens [358] Photo ...

7. Samyang Optics - Wikipedia

   en.wikipedia.org/wiki/Samyang_Optics

   Samyang MF lens. Interchangeable manual focus lenses for 9 different mounts. [2] [better source needed]MF 85 mm f / 1.4 RF; MF 14 mm f / 2.8 RF; 85 mm f / 1.8 ED UMC CS; 12 mm f / 2.8 ED AS NCS Fish-Eye