"The Canon EOS 30D is the successor to the popular EOS 20D, aimed at the higher-end enthusiast market. When it was announced in February 2006 though, there was some surprise and disappointment to learn it used exactly the same 8.2 Megapixel sensor as its predecessor. Until this point, Canon buyers could traditionally look forward to higher resolution sensors on new bodies.
But after this initial surprise wore off, Canon’s reasoning became clearer. The earlier 20D already delivered excellent image quality with very low noise, so beyond marketing numbers, was there really any point increasing the resolution of its sensor? Instead Canon took the already successful 20D and addressed its criticisms." Read the full review here