The low ISO performance on the D10 was very good. Noise was in short supply below ISO 200, and fine detail and sharpness were noticeably better than other cameras in its class. Subjects get visibly grainier between ISO 200 and 400, and at ISO 400 things start to look smeary. At ISO 800 it looks like something's smeared on the lens. You can pretty much write off using ISO 1600.
This was just a random one-handed snapshot I took while walking by these flowers. However, you can still see that the D10 has very good sharpness and detail. Had I stopped to actually steady the camera, this photo might have been sharper. It's only in the very corners of photos that photos got slightly softer at ISOs below 400.