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 company was founded in 1961 by Michihiro Yamaki, who was Sigma's CEO until his death at age 78 in 2012.
Sigma products work with cameras from Canon, Nikon, Fujifilm, Pentax, Sony, Olympus and Panasonic, as well as their own cameras.
Sigma has also made lenses under the Quantaray name, which have been sold exclusively by Ritz Camera. Similarly, Sigma lenses were sold exclusively by the former Wolf Camera, but following the merger of Wolf and Ritz, both brands could be purchased.
Sigma's digital SLRs, the SD9, SD10, SD14 and SD15, plus the latest SD1 are unusual in their use of the Foveon X3 image sensor. The company's mirrorless cameras, the Sigma SD Quattro and SD Quattro H, use the Foveon Quattro sensor, an updated version of the Foveon X3. All use the SA lens mount. The Sigma DP series of high-end compact P&S cameras also use the Foveon Quattro sensor, which gives them a much larger sensor than other cameras of this type.
In September 2018 Sigma became one of the founding members of the L-Mount Alliance; it announced that it will cease to develop SA-mount cameras and instead use the Leica L-Mount. A new full-frame mirrorless camera, Sigma FP, was launched in 2019 along with a range of L-Mount lenses and adapters.
Sigma is the world's largest independent lens manufacturer and is a family-owned business.
Up until the Sigma FP, all Sigma SLR, DSLR, and mirrorless cameras used the Sigma SA mount, which is mechanically similar to the Pentax K mount and electrically an adaptation of the Canon EF lens mount lens control system.
Sigma has been one of the first companies to experiment with putting the Foveon X3 sensor in consumer digital cameras. During photokina 2010, Sigma announced a new flagship DSLR camera, the SD1, featuring a 46MP Foveon X3 sensor. In recent years their DSLR range has been discontinued in favor of mirrorless designs.
Sigma has made a number of film SLR cameras, including the SA-300, SA-5, SA-7 and SA-9.
Sigma also produced the DP series of high-end compact digital cameras. The Foveon APS-C sized sensors were similar to those used in the DSLR line. The most-recent line made use of the Quattro sensor, a variant of the Foveon design that had higher resolution top layers and lower resolution lower layers combined into a final image, claimed to be equivalent to a 39 megapixel color filter array image. The four compact cameras were differentiated by their fixed prime lens, with the ultra wide DP0, the wide DP1, the normal DP2 and the telephoto DP3.
In February 2016, Sigma announced two new mirrorless camerasâÂÂthe SD Quattro and SD Quattro H. Both cameras used the full-depth Sigma SA mount, allowing the use of existing SA-mount lenses, and also used Foveon Quattro sensors. The SD Quattro uses an APS-C sensor with 19.6 MP in the top layer, while the SD Quattro H used an APS-H (1.35x crop) sensor with 25.5 MP in the top layer. The company claimed that the Foveon Quattro technology produced a level of detail equivalent to that of a Bayer sensor with twice the pixel count.
In July 2019, Sigma announced the Sigma fp, a small form-factor, 24.6MP full-frame mirrorless camera. At the time of launch it was the world's smallest. This was followed by the FP-L in 2021 with a 61mp sensor. Both cameras were able to shoot up to 14-bit RAW video.
In April 2025, Sigma announced the launch of the Sigma BF camera, said to stand for "Beautiful Foolishness". The user interface is intentionally minimal, utilizing only three buttons and one dial. The BF camera is equipped with a 24-megapixel full frame back-illuminated CMOS sensor. As Sigma is part of the L Mount alliance, the Sigma BF is fitted with an L mount. Uniquely, the BF camera relies primarily on 230GB of internal storage rather than typical memory card slots.
Sigma produces multiple software packages for use with their cameras and lenses.
Sigma makes autofocus lenses for the Sigma SA, Canon EF and RF, Nikon F and Z, Fujifilm X, Minolta/Sony ñ and E, Pentax K, Leica L, Four Thirds, and Micro Four Thirds lens mounts. Each lens may not be available in all mounts, and may lack certain features (such as HSM) on certain mounts.
In August 2013, Sigma announced that starting the following month, it would offer a mount conversion service for its newest "Global Vision" lensesâÂÂthose with either an "A" (Art), "C" (Contemporary), or "S" (Sport) as part of their model name. For a cost that varies with lens and marketâÂÂfrom $80 to $250 in the U.S., not including shipping costsâÂÂowners 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. Lenses designed for DSLRs can be converted to Canon EF, Nikon F, Pentax K, Sigma SA, or Sony A mounts; those designed for MILCs can be converted to Micro Four Thirds or Sony E-mount.
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In 2011, Nikon filed a suit against Sigma, alleging it had violated patents relating to Nikon's "Vibration Reduction" image stabilisation technology. In 2015, the suit ended through settlement, with no details disclosed.