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Sigma CorporationSigma is the largest supplier of third-party camera lenses in the world, For over four decade they has been providing more affordable options to camera manufacturers’ own brand of lenses. In 2002 Sigma introduce its first DSLR, the SD-9, employing Foveon’s unique X3 image sensor (which documents full color information about every pixel, totally different than Bayer sensors employed in all other digital cameras) plus its own unique lens mount. Identical technology which is also employed in the DP line of large sensor compact cameras. The sensor has been updated recently to offer substantially higher resolution installed in the body of the SD1. Sigma acquired Foveon, in late 2008 with the objective of increasing the time frame of its previously almost non-existent camera release schedule. Updated Article Apr 4, 2011

Sigma Compact Digital Camera Knowledge BaseSigma Compact Digital Camera Knowledge Base
Sigma cameras are engineered to portray the world exactly like it is imaged through the human eye allowing the emotions to register colors in all their passion. Sigma manufactures their own innovative Foveon image sensor providing the latest technology. These identical sensors are employed in both DSLR and digital compact cameras. Sigma’s digital compact cameras provide an edge over other compacts where their sensor sizes are 7 to 12x sizes smaller than the Foveon image sensor and are not able replicate color in the way as the Foveon sensor does allowing Sigma cameras to deliver an image with the richest, accurate colors. Updated Article

Sigma 35mm Digital Camera Knowledge BaseSigma Cameras Updated Article Feb 21, 2011 -

Since 2007 Sigma has developed three DSLR cameras, including the SD9, SD10 and SD14. In 2008, Sigma also added a high end Compact Digital Camera, known as the DP1 which employs the same big image sensor that's installed in Sigma’s DSLR cameras.  Every Sigma Camera, including SLR and DSLR camera employs the Sigma SA mount, which is mechanically analogous to the Pentax K mount plus it's an electrical reworked copy of the Canon EF lens mount lens management system.

Sigma Prime Lens Knowledge BaseSigma Prime Len Knowledge Base - Updated Article Feb 17, 2011 - Advantages of a Sigma prime lens over a zoom. Primes are sharper. It’s nearly always simpler to build sharper glass when it's not necessary to contend with multiple elements that move. When contrasting a quality prime and a quality zoom, most often, you’ll find the prime to be sharper Quicker. High quality primes are fitted with fast maximum apertures such as f/1.2, f/1.4, f/1.8. As of now, no one has created a zoom this quick no matter the focal length. Faster apertures allow you to shoot at lower ISO (and thus lower noise) as the illumination becomes low. Or to handhold in very poor light. See a fast aperture example below. a handheld ISO 3200, 1/6 shot made possible because it was captured at f/1.4 which is wide open.

Sigma Zoom Lens Knowledge BaseSigma Zoom Lens Knowledge Base - Updated Article - Sigma offers a number of less expensive alternatives, and they do not equate to lower quality and image features. At times getting the Sigma is well worth the money, particullarly a Sigma with the EX designation. EX lenses have a propensity to encompass great build and image features. Sigma is also reknown for it's standard primes such as the 30mm and 50mm lenses. In certain focal lengths like in the 100-500mm series, Sigma has an illustrious collection featuring affordable prices and engineering not found in Canon or Nikon lenses.nearly all Sigma lenses are manufactured in mounts for Nikon, Canon, Minolta/Sony, Pentax and of course Sigma.

Sigma Filters
Sigma's EX DG filters benefit from our multi-layer lens coating, developed to counteract the highly refle

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Gene Wright Vistaview360.com: Digital Camera Reviews