Sigma has unveiled the SD1 digital SLR, which sports a newly designed 46 megapixels 24×16mm APS-C X3 direct image sensor. The three-layered sensor is claimed to capture all primary RGB colors "at each and every pixel location, ensuring the capture of full and complete colour," says Sigma.

The sensor uses three silicon-embedded layers of photo detectors, "stacked vertically to take advantage of silicon’s ability to absorb red, green and blue light at different respective depths." Sigma adds that the technology "efficiently reproduces colour more accurately, and offers sharper resolution, pixel for pixel, than any conventional image sensor."

In addition, claims Sigma, since color moiré isn't generated, "the use of a low-pass filter is not required, meaning light and colour, generated by the sensor is captured with a three-dimensional feel."

Sigma says it is working on a full-frame version of the sensor, despite the three-layer design's complexity.

The DSLR also uses dual TRUE II processing engines to ensure that images are processed quickly. It features an 11-point twin-cross autofocus sensor, a three-inch TFT colour LCD screen and a Pentaprism viewfinder.

The SD1 is housed in a magnesium-alloy body designed to "withstand rough use and shocks in harsh conditions." It is also weather-resistant thanks to O-ring sealing connections.

While Sigma did not confirm a release date and price for the SD1, it does say that the camera will be compatible with more than 40 Sigma lenses.

More details to come today...