The breakthrough Sigma SD9 high-definition, digital single-lens reflex (SLR) camera contains the world's first image sensor to feature three layers of photo-detectors. The camera’s SLR system can take advantage of over 30 different lenses, from 8mm circular fisheye to 800mm ultra-telephoto, plus two digital flashguns, power pack, and accessories.

Optics and Resolution
The Sigma SD9, powered by the Foveon X3 image sensors, captures red, green, and blue light at each and every pixel in three distinct layers. All other image sensors feature just one layer of photo-detectors, with just one photo-detector per pixel.

The SD9's three layers are embedded in silicon to take advantage of the fact that red, green, and blue light penetrate silicon to different depths, allowing full color to be measured at every pixel. This means that for every pixel on a Foveon X3 image sensor, there's actually a stack of three photo-detectors, forming the first and only full-color capture system.

Storage and Transfer
The SD9 uses CompactFlash memory cards and is compatible with CompactFlash Type I/II cards, which enables you to use IBM Microdrives as well. You can transfer the images from camera to computer with high-speed IEEE 1394 (also known as FireWire) and widely available USB (1.1) interfaces. The camera's video-output system can be switched between the PAL system (used in Europe) and the NTSC system (used in Japan and the U.S.).

Image Format
With the RAW data recording system of the SD9, it is possible to obtain high-picture definition and compact file size. The lossless compression system of RAW data eliminates image deterioration, and provides superior pictures, without sacrificing original image quality.

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