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]
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]
The Foveon X3 sensor is a digital camera image sensor designed by Foveon, Inc., and manufactured by Dongbu Electronics. It uses an array of photosites that consist of three vertically stacked photodiodes. Each of the three stacked photodiodes has a different spectral sensitivity, allowing it to respond differently to different wavelengths. The signals from the three photodiodes are then processed as additive color data that are transformed to a standard RGB color space. In the late 1970s, a similar color sensor having three stacked photo detectors at each pixel location, with different spectral responses due to the differential absorption of light by the semiconductor, had been developed and patented by Kodak.
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