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2. 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.

3. Sigma 150-600mm f/5-6.3 DG OS HSM lens - Wikipedia

   en.wikipedia.org/wiki/Sigma_150-600mm_f/5-6.3_DG...

   The Sigma APO 150-600mm F5-6.3 DG OS HSM lens is a super-telephoto lens produced by Sigma Corporation. It is actually a range of two slightly different lenses based on a common design: the Sports and Contemporary. Both lenses feature similar specifications, but there are some notable differences.

4. 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.

5. Wray (lenses) - Wikipedia

   en.wikipedia.org/wiki/Wray_(lenses)

   Wray (Optical Works) Ltd. was a British camera and lens manufacturer based in Ashgrove Road, Bromley, Kent, UK.It operated from 1850 to 1971, making lenses for cameras, photographic enlargers, reconnaissance, mapping, microchip replication, and an anamorphic projection system for cinemas.

6. 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 ...

7. Schneider Kreuznach - Wikipedia

   en.wikipedia.org/wiki/Schneider_Kreuznach

   The 1000 mm lenses, by comparison, give only an 18° angle of coverage, but require even less focal distance than other telephoto designs (slightly more than 1/2 the effective focal length, as opposed to about 2/3 for a normal tele lens). 180mm f/5.5; 180mm f/5.6; 240mm f/5.5; 270mm f/5.5; 300mm f/5.5; 360mm f/5.5 (for 4x5") [4] 500mm f/5.5 ...