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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.
Samyang Optics is a South Korean manufacturer of camera lenses for several major brands of third-party mounts for still photography and video cameras.The company was founded in 1972 and has about 150 employees.
The optical construction consists of 21 lens elements divided into 15 groups. The 9-bladed diaphragm begins at f/5 when shooting wide open, progressing towards f/6.3 at 500mm. As expected with similar long telephoto zoom lenses, optical quality drops off at the extremes of the telephoto range.
Interchangeable lenses for digital and conventional SLR cameras, including compact high-ratio zoom lenses of which Tamron was the pioneer in 1992 when it released the 28–200 mm. [3] The most-current lens of this type is the AF 16–300 mm F/3.5-6.3 Di II VC PZD MACRO. Tamron was the maker of the manual-focus Adaptall series which have ...
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 ...
For a cost that varies with lens and market—from $80 to $250 in the U.S., not including shipping costs—owners can send their lenses to their local Sigma company, which in turn sends them to Japan for mount replacement, including calibration and optimization for the new camera system.
The front element of the Tessar can be replaced to make a long-focus or wide-angle lens. In 1957 Carl Zeiss offered the long-focus Pro Tessar 115 mm f/4 and 85 mm f/4, and the wide-angle Pro Tessar 35 mm f/3,2 for use on the central-shutter SLR Zeiss Ikon Contaflex Super B cameras.
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.)
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