Canon began its fullest assault on the camera market pre-Photokina with the launch of the EOS 50D. The spiritual successor to the EOS 40D boosts the sensor to 15.1 megapixels and is consciously targeted at the extremely high ISO ranges shooting of newer Nikon cameras. By fitting gapless microlenses on top of the pixels, Canon says it has cut back on noise and can introduce two ultra-high sensiti