A fisheye lens is an ultra wide-angle lens that produces strong visual distortion intended to create a wide panoramic or hemispherical image. Fisheye lenses achieve extremely wide angles of view, well beyond any rectilinear lens. Instead of producing images with straight lines of perspective, fisheye lenses use a special mapping, which gives images a characteristic convex non-rectilinear appearance.
Sigma Corporation is a Japanese company, manufacturing cameras, lenses, flashes and other photographic accessories. All Sigma products are produced in the company's own Aizu factory in Bandai, Fukushima, Japan. Although Sigma produces several camera models, the company is best known for producing high-quality lenses and other accessories that are compatible with the cameras produced by other companies.
The Nikon F-mount is a type of interchangeable lens mount developed by Nikon for its 35mm format single-lens reflex cameras. The F-mount was first introduced on the Nikon F camera in 1959, and features a three-lug bayonet mount with a 44 mm throat and a flange to focal plane distance of 46.5 mm. The company continues, with the 2020 D6 model, to use variations of the same lens mount specification for its film and digital SLR cameras.
The Pentax K-mount, sometimes referred to as the "PK-mount", is a bayonet lens mount standard for mounting interchangeable photographic lenses to 35 mm single-lens reflex (SLR) cameras. It was created by Pentax in 1975, and has since been used by all Pentax 35 mm and digital SLRs and also the MILC Pentax K-01. A number of other manufacturers have also produced many K-mount lenses and K-mount cameras.
The Sigma 30mm f/1.4 EX DC HSM is a wide-aperture photographic lens made by the Sigma Corporation, equipped with a Hyper Sonic Motor. The lens was produced in Canon EF mount, Four Thirds System, Nikon F-mount, Pentax K mount, the SA mount, and the Sony/Minolta AF Mount varieties, all of the same optical formula. It shipped with a removable petal-type lens hood. The lens assumes a crop factor of roughly 1.5, and therefore is not usable with on full-frame or 135 film cameras.
The Sigma 8mm f/3.5 EX DG is a photographic lens introduced on 9 August 2006. It is a circular fisheye lens, designed to project a 180-degree field of view in all directions onto a circular image when used on a full-frame camera. The lens is available in Canon, Nikon, and Sigma mounts.
The 10-20mm F4-5.6 EX DC HSM is an enthusiast-level, ultra wide-angle rectilinear zoom lens made by Sigma Corporation specifically for use with small format digital SLRs.
The Sigma 50mm f/1.4 EX DG HSM is a normal prime lens made by the Sigma Corporation.
The Sigma 150mm f/2.8 APO Macro EX DG HSM is a telephoto macro prime lenses made by Sigma Corporation.
The AF DX Fisheye-Nikkor 10.5mm f/2.8G ED is a fisheye lens manufactured by Nikon for use on Nikon DX format digital SLR cameras. It provides a full 180-degree angle of view on a DX format camera.
The Sigma 18-50mm f/2.8 EX DC Macro is a wide to normal angle, zoom lens made by the Sigma Corporation.
The Sigma 12-24mm f/4.5-5.6 EX DG HSM is a professional-level wide-angle zoom lens made by Sigma Corporation. At launch it was the widest rectilinear lens available for full-frame 35mm SLR cameras, providing a field of view of 122 degrees. It has since been surpassed by the Canon EF 11-24mm f/4L zoom lens and the Irix 11mm f/4, a manual focus prime lens. The Sigma 12-24 has low distortion even compared to less wide zooms like the Canon EF 16-35mm lens.
The Sigma 10mm f/2.8 EX DC fisheye is a photographic lens manufactured by Sigma Corporation. It is a diagonal fisheye lens. Unlike most fisheye lenses, this lens is designed for digital SLR cameras that do not have a full 36x24mm sensor. This results in a much greater fisheye effect than is possible when a full-frame fisheye lens is used with a smaller sensor. The projection type of this lens is equidistant
The Sigma APO 180mm F3.5 EX DG lens was a telephoto/macro lens produced by Sigma Corporation. It contained two SLD glass elements to provide correction for chromatic aberration and was aimed toward advanced consumers.
The Sigma 50-500mm f/4-6.3 EX DG HSM is a super-telephoto zoom lens produced by Sigma Corporation. It is commonly known as the "Bigma" because of its long and heavy body. It contains four SLD glass elements to provide correction for chromatic aberration. It is aimed at advanced consumers.
The 18-50mm f/2.8-4.5 DC OS HSM is a wide-angle zoom lens produced by Sigma Corporation. The lens has four different variates, fitting on the Canon EF mount, Pentax K mount, Minolta A-mount, and the Nikon F-mount. It features internal focusing and internal zooming, as well as two SLD elements and three aspherical lenses.
The Sigma 8–16mm lens is an enthusiast-level, ultra wide-angle rectilinear zoom lens made by Sigma Corporation specifically for use with APS-C small format digital SLRs. It is the first ultrawide rectilinear zoom lens with a minimum focal length of 8 mm, designed specifically for APS-C size image sensors. The lens was introduced at the February 2010 Photo Marketing Association International Convention and Trade Show. At its release it was the widest viewing angle focal length available commercially for APS-C cameras. It is part of Sigma's DC line of lenses, meaning it was designed to have an image circle tailored to work with APS-C format cameras. The lens has a constant length regardless of optical zoom and focus with inner lens tube elements responding to these parameters. The lens has hypersonic zoom autofocus.
The Sigma 300 – 800 mm lens is a professional-level supertelephoto zoom lens made by Sigma Corporation from 2005 to 2019 for use with digital SLRs. It is a modification of the non-DG model Sigma 300-800mm F5.6 EX APO IF HSM was being in production in 2003–2005. Due to its massive size and weight, the lens has been nicknamed the "Sigmonster"
The EF 11–24 mm f/4L USM lens is a professional wide-angle lens made by Canon Inc. It was announced on February 5, 2015, and at that time was the widest rectilinear lens ever made for the 35 mm format in either its film or digital versions.
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