The Sigma DP1 was a high-end compact digital camera introduced by the Sigma Corporation. It featured a 14-megapixel Foveon X3 sensor (2652 × 1768 × 3 layers), a fixed 16.6 mm F4.0 lens (28mm equivalent), a 2.5” LCD and a pop-up flash. It was the first "compact" camera that featured an APS-C sized sensor, a feature that Sigma claimed would result in DSLR quality images from a small, pocketable camera.

It was first announced on September 26, 2006, and after several production delays was delivered in the spring of 2008.

A follow-up camera, the Sigma DP2, was released in 2009; it features a different lens, and they are being sold in parallel. An improved version called DP1S was announced on November 17, 2009.

In February 2012 it was announced by Sigma Corporation that an updated version of both the DP1 and DP2 series, to be known as DP1 Merrill and DP2 Merrill, will incorporate the updated 46 MP Foveon sensor of the SD1, resulting in substantially greater image detail.

Another notable change of the 'Merrill' DP cameras is the focus ring is now in the traditional location around the lens barrel.

Available in March 2013, the Sigma DP3 Merrill has 46MP with 50mm f2.8 (75mm in 35mm film format) and a new Face Detection autofocus.
The Sigma SD1 is a digital SLR camera produced by the Sigma Corporation of Japan. The camera uses a Foveon X3 sensor, which comprises 3 layers of 4800 x 3200 pixels (46 megapixels), giving much higher chromatic resolution than the equivalent Bayer array. It uses a Milbeaut image processor. The Foveon sensor does not use an aliasing filter, thus further improving the resolution.

The SD1 was announced by Sigma at Photokina 2010 on September 21, 2010. It was officially put on sale in May 2011 at a RRP of nearly US $10,000.

In February 2012, the SD1 was relaunched as the SD1 Merrill, honoring the late Dick Merrill, inventor of the Foveon sensor. With the relaunch, the price was dramatically cut, to a recommended price of US$3300 and a minimum advertised price of $2299. Sigma gave existing SD1 owners credit toward the company's lenses and accessories equal to the price cut.
The Sigma DP2 Quattro is a large sensor digital compact camera announced by Sigma Corporation on February 13, 2014. It is the first Sigma camera to feature a new, "Quattro" branded sensor.