The Four Thirds System is a standard created by Olympus and Eastman Kodak for digital single-lens reflex camera (DSLR) and mirrorless camera design and development.
A digital single-lens reflex camera is a digital camera that combines the optics and the mechanisms of a single-lens reflex camera with a digital imaging sensor.
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.
Advanced Photo System type-C (APS-C) is an image sensor format approximately equivalent in size to the Advanced Photo System film negative in its C ("Classic") format, of 25.1×16.7 mm, an aspect ratio of 3:2. It is therefore also equivalent in size to the Super 35 motion picture film format, which has the dimensions of 24.89 mm × 18.66 mm.
In digital photography, the crop factor, format factor, or focal length multiplier of an image sensor format is the ratio of the dimensions of a camera's imaging area compared to a reference format; most often, this term is applied to digital cameras, relative to 35 mm film format as a reference. In the case of digital cameras, the imaging device would be a digital sensor. The most commonly used definition of crop factor is the ratio of a 35 mm frame's diagonal (43.3 mm) to the diagonal of the image sensor in question; that is, CF=diag35mm / diagsensor. Given the same 3:2 aspect ratio as 35mm's 36 mm × 24 mm area, this is equivalent to the ratio of heights or ratio of widths; the ratio of sensor areas is the square of the crop factor.
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.
Lumix is Panasonic's brand of digital cameras, ranging from pocket point-and-shoot models to digital SLRs.
Bridge cameras are cameras that fill the niche between the single-lens reflex cameras (SLRs) and the point-and-shoot camera which are prominent in the prosumer market segment. They are often comparable in size and weight to the smallest digital SLRs (DSLR), but lack interchangeable lenses, and almost all digital bridge cameras lack an optical viewfinder system. The phrase "bridge camera" has been in use at least since the 1980s, and continues to be used with digital cameras. The term was originally used to refer to film cameras which "bridged the gap" between point-and-shoot cameras and SLRs.
The Fujifilm FinePix F series is a line of compact digital cameras that was known for its low-light performance in 2005, with relatively low image noise and natural colors even at high ISO settings. With its relatively large, but moderate-resolution Super CCD sensors, it concentrated on image quality, and low-light shooting without flash, which was mostly restricted to prosumer models at the time.
The Minolta A-mount camera system was a line of photographic equipment from Minolta introduced in 1985 with the world's first integrated autofocus system in the camera body with interchangeable lenses. The system used a lens mount called A-mount, with a flange focal distance 44.50 mm, one millimeter longer, 43.5 mm, than the previous SR mount from 1958. The new mount was wider, 49.7 mm vs 44.97 mm, than the older SR-mount and had a longer flange focal distance making old manual lenses incompatible with the new system. The mount is now used by Sony, who bought the SLR camera division from Konica Minolta, Konica and Minolta having merged a few years before.
The Micro Four Thirds system is a standard released by Olympus and Panasonic in 2008, for the design and development of mirrorless interchangeable lens digital cameras, camcorders and lenses. Camera bodies are available from Blackmagic, DJI, JVC, Kodak, Olympus, Panasonic, Sharp, and Xiaomi. MFT lenses are produced by Cosina Voigtländer, DJI, Kowa, Kodak, Mitakon, Olympus, Panasonic, Samyang, Sharp, Sigma, SLR Magic, Tamron, Tokina, Veydra, and Xiaomi, amongst others.
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 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.
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 Sony α6000 is a digital camera announced 12 February 2014. It is a mirrorless interchangeable lens camera (MILC), which has a smaller body form factor than a traditional DSLR while retaining the sensor size and features of an APS-C-sized model. It is targeted at professionals, experienced users, and enthusiasts. It replaced the NEX-6 and NEX-7. Review websites note that although the α6000 uses a 24 MP sensor like the Sony NEX-7, the Sony α6000 can also be seen as more of a replacement of the Sony NEX-6. In the Firmware version 1.10, an android subsystem was added. The sub system was used to run Sony's apps.
The Sigma 50mm f/1.4 DG HSM Art lens is a professional-level fixed focal length lens made by Sigma Corporation. It was announced at CES in January 2014 and immediately became highly anticipated amid reports that Sigma was not aiming to compete against Canon or Nikon's 50mm prime lenses but rather the newly released Zeiss Otus 55/1.4, a lens costing US$4000. Retail prices for the Sigma 50mm lens had not yet been announced but it was initially expected that it would sell for around US$1350. However, when official pricing was announced on April 11, 2014, the retail price was even lower: US$950.
The Sigma 300 – 800 mm lens is a professional-level supertelephoto zoom lens made by Sigma Corporation since 2005 till 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.
The Leica L-Mount is a bayonet mount developed by Leica Camera AG for interchangeable-lens autofocus digital cameras.
The Zeiss Batis Sonnar T* 2.8/135mm is a full-frame (FE) telephoto prime lens for the Sony E-mount, announced by Zeiss on April 24, 2017.
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