The camera prototype was on display at the Photo Marketing Association trade show here. It featured a main camera body and a detachable grip for taking vertically oriented shots and--if other manufacturers' products are anything to go by--for housing more batteries.
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More images of upcoming Olympus dSLR
The DP1 also has a 2.5-inch display, a fixed 28mm lens, a hot shoe to mount an external flash and support for RAW images taken directly from the sensor without in-camera processing.
The camera is due to ship in the US this summer, Sigma said, but the company isn't releasing price details. At press time, the regional distributor for Sigma in Asia was unable to furnish further details either.
Read more camera gizmos here | Latest PMA 2007 coverage