The Sigma sd Quattro H Digital Camera is hte first camera to feature the newly developed APS-H size Foveon X3 Quattro direct image sensor with incredible 44.8 megapixel (51 megapixel equivalent) resolution. Featuring the Sigma SA mount, the Quattro H is compatible with all of the Sigma Global Vision lenses in the Contemporary, Sports, and Art lines, and it is designed to take full advantage of these lenses' superb optical performance.
The Quattro H uses a 1:1:4 RGB pixel ratio with a layered design, thus eliminating the need for an optical low-pass filter. The sd Quattro H can create
25.5MP lossless compressed raw images with a spatial resolution
equivalent to, and with richer colors, than that of a 51MP Bayer sensor.
These vast quantities of image data are handled quickly and efficiently
thanks to a Dual TRUE III image processing engine. Additionally, the
relatively unique APS-H size provides a 1.3x crop factor when compared
to a full-frame 35mm sensor.
Image quality is the key advantage of the Foveon sensor, with the
processing and available feature set allowing photographers to benefit
as much as possible from the technology. Ensuring sharp imagery, this
newly designed sensor has a hybrid phase- and contrast-detect autofocus
system with nine selectable points. There is even focus peaking for
shooters who prefer the precision of manual focus. Users will also be
able to shoot at up to 3.8 fps in High quality and with a sensitivity
reaching up to ISO 6400. Also, a Super-Fine Detail exposure mode is
available which will take seven exposures and blend them into one
exceptionally clean raw image file with a wide dynamic range.