Sigma SD1

Sigma SD1
	Sigma SD1 with 50mm, f/1.4
Overview
Type	Digital single-lens reflex
Intro price	$9799 USD
Lens
Lens	Interchangeable (Sigma SA mount)
Sensor/medium
Sensor	23.5×15.7mm APS-C 1.5x crop (Foveon X3)
Maximum resolution	4704 × 3136 × 3 (44.3 million effective pixels, 14.8 megapixel output image size)
Film speed	100–6400
Storage media	CompactFlash (CF) Type I (Not microdrive or CF Type II)
Focusing
Focus modes	Single AF, Continuous AF (with AF motion prediction function) and Manual
Focus areas	11-point twin-cross AF
Viewfinder
Viewfinder	Optical, pentaprism
Image processing
Image processor	True II Image processing engine
General
LCD screen	3 in (63 mm), 460,000 pixels
Made in	Japan

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.^[1]

Sigma SD1 Merrill

In February 2012, the SD1 was relaunched as the SD1 Merrill, honoring the late Richard B. 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.^[2]