Nikon announced that Japanese astronaut Akihiko Hoshide had the digital SLR Camera Nikon D2XS with him at his space trip to the ISS last month.

On this mission, several Nikon products, including six digital SLR camera Nikon D2XS, three NIKKOR lenses (AF-S DX Zoom-Nikkor 12-24mm f/4G IF-ED, and AF DX Fisheye-Nikkor 10.5mm f/2.8G ED), and Speedlights (SB-800) were used.

In addition to recording activities inside the space shuttle and the ISS, the D2XS was used to photograph the External Tank from the Shuttle Flight deck soon after it separated from the Shuttle.

Hoshide also used the D2XS to record clear images of activities inside the Space Shuttle and Space Station as well as views out the windows of spacewalking activities and Earth. Beautiful images were also taken of the Space Station from inside the Space Shuttle as they were undocking and preparing for return to Earth.
Four of the six D2XS cameras carried aboard Discovery mission were left on the ISS to enable continued recording of ISS activities and for future damage inspection photography of upcoming Shuttle missions.

Except for changes in lubrication oil to meet NASA specifications and the adoption of a specialized firmware, the D2XS cameras used aboard the Space Shuttle and in the ISS were basically the same as commercial models. The D2XS, released in June 2006, is a high-end Nikon digital SLR camera.
See some photos in this Nikon press-release. See also Amazon.com where the D2XS is on sale.