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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 Samyang 500mm F8.0 MC Mirror is a supertelephoto lens and is designed for full frame DSLRs. [1] It is a mirror lens. The lens is made in South Korea by Samyang Optics and marketed under several brand names, including Rokinon and Walimex. The lens uses manual focus only. As all mirror lenses, it cannot change the aperture.
Samyang 8mm f/3.5 Fisheye CS II; Samyang 8mm F2.8 UMC Fisheye; Samyang 8mm F3.5 Aspherical IF MC Fisheye; Samyang 8mm f3.5 fisheye; Samyang 10mm f/2.8 ED AS NCS CS; Samyang 12mm F2.8 ED AS NCS Fish-eye; Samyang 14mm f/2.8 IF ED UMC Aspherical; Samyang 16mm f/2.0 ED AS UMC CS; Samyang 24mm f/1.4 ED AS UMC; Samyang T-S 24mm f/3.5 ED AS UMC ...
This means that lenses that lack the lens information contacts introduced with the K A-mount (Pentax K- and M-series lenses as well as some third-party products) do not support open-aperture metering on these bodies. Instead, stop-down metering must be carried out by pushing the “green button” on the camera before taking a shot.
Category: Mirror lenses. ... Samyang 500mm f/8; Sony α Reflex 500mm f/8 This page was last edited on 31 December 2018, at 20:56 (UTC). Text is available under the ...
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.
A fast prime (fixed focal length) lens, the Canon 50mm f / 1.4 (left), and a slower zoom lens, the Canon 18–55mm f / 3.5–5.6 (right); this lens is faster at 18mm than it is at 55mm. Lens speed is the maximum aperture diameter, or minimum f-number, of a photographic lens.
As an example, one modern lens (Canon EF 400 mm f /4 DO IS) achieves a telephoto ratio of 0.58 in part due to a front (converging) lens group which incorporates diffractive optics. Diagram of a typical telephoto lens with a large positive lens and a smaller negative telephoto group combined to create a much longer focal length - f.
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