The Canon EOS 30D is an upgrade from the Canon EOS 20D digital single lens reflex. Little has changed — the 8 megapixel sensor is the same and image processing uses the same Digic engine. The most significant improvement has been the addition of spot metering.
Controls are not intuitive. By default the camera uses an absurd auto focussing system that is almost guaranteed to produce out-of-focus images. To reset the auto focus area to the same centre spot as the exposure meter it is necessary to consult the instruction book.