Closely related to the company's existing DP1 model, the Sigma DP2 is based around a 0.98" diagonal Foveon X3 image sensor, which has an effective resolution of 4.64 megapixels with full color measured at every pixel location. The sensor sits behind a 41mm equivalent fixed focal length Sigma lens, and offers ISO sensitivity from 50 to 1,600 equivalents.
Sigma DP2 firmware version 1.04 improves one specific function of the camera, according to the company. The main change of the new firmware is an improvement in autofocusing speed - the first time this has been addressed in the camera's firmware, although two previous updates have fine-tuned autofocus accuracy.
No other changes are listed in the release notes for the new firmware. Instructions on how to check your current firmware version, and how to upgrade the firmware, as well as the update file itself can all be found on the Sigma website.