The Nikon D2HS has a CCD sensor type which is better than most cameras that were released more than two years ago. Most digital cameras that were released more than two years ago have a MOS sensor type. CCD sensors produce high quality, low-noise images but consume a lot more power than CMOS sensors. CCD is the most common image sensor type used in digital cameras.
This digital camera's sensor type (CCD) is actually the best sensor type across all comparable spec cameras that have been around for more than two years.
The worst sensor type across similar types of digital camera is MOS.