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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.
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.
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.
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 ...
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 ...
The focal point F and focal length f of a positive (convex) lens, a negative (concave) lens, a concave mirror, and a convex mirror. The focal length of an optical system is a measure of how strongly the system converges or diverges light ; it is the inverse of the system's optical power .
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.
Sigma 15 mm f /2.8 EX DG Diagonal Fisheye; TTArtisan 11mm f /2.8 Fisheye (notable as the first fisheye lens marketed, among others, in Leica M rangefinder mount and for Fuji GFX (the lens does not cover the full GFX frame, though!). An expert found it is actually 15 mm in focal length and has an angle of view of only 176°.
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