The EOS 20D is compatible with all Canon lenses in the EF lineup, ranging from ultra-wide-angle to super-telephoto lenses, and including Canon's new EF-S series lenses, manufactured specifically for the 20D and Digital Rebel. The EF lineup employs advanced optical know-how and micron precision engineering to deliver unprecedented performance in all facets of the photographic process. Aspherical optics and Fluorite elements, for example, are featured in the universally acclaimed L-series Lenses. Canon's Image Stabilization feature minimizes the effect of camera shake. Through Canon's EF Lenses, photographers can truly maximize the quality and liberating performance of the EOS 20D.
EOS 20D users will find the all-new EF-S 17-85mm f/4-5.6 IS USM lens a perfect match for their new camera. It offers a 35mm equivalent of 27-136mm zoom range, includes Canon's Image Stabilizer (which adds an equivalent of 3 stops), a full-time manual focus mechanism, all in a compact, robust construction.
For wide-angle aficionados, the new EF-S 10-22mm f/3.5-4.5 USM (available in October, 2004) provides the shortest minimum focal length ever offered in an interchangeable digital SLR lens (excluding fisheye lenses). With a 35mm equivalent 16-35mm zoom range, high-speed USM autofocus and full-time manual focus, the EF-S 10-22mm zoom lens significantly expands the versatility of the EOS 20D.
The EOS 20D features the acclaimed E-TTL II flash metering system introduced with the EOS-1D Mark II. Whether using its flush mounted integral flash (guide no. of 43/13 @ ISO 100 m/ft.) or any of the flashes in the EX Speedlite line, E-TTL II provides stable flash brightness through numerous exposures.
Canon's new Speedlite 580EX is perfectly suited to the EOS 20D. It includes a maximum guide no. of 190/58 @ ISO 100 m/ft., which, when mounted on the EOS 20D, automatically compensates for the EOS 20D's sensor size, enabling high output flash, with more flashes per charge. It includes an AF-assist Beam, which works in conjunction with the EOS 20D's focusing system, and automatically sends color temperature information to the camera when the flash fires, for more accurate color rendition with flash photography.
In addition to Canon's EF series of lenses and Speedlites, several other accessories are designed to work specifically with the EOS 20D. The Battery Grip BG-E2 adds a vertical shutter release, and is compatible with up to two of Canon's BP-511/511A/512/514 Lithium-ion battery packs, or alternatively a set of six AA batteries, for greater convenience when traveling. Canon's Semi Hard Case EH/7-L can accommodate the EOS 20D with a small zoom lens (EF-S17-85mm f/4-5.6 IS USM included), and the EOS 20D is compatible with Canon's DVK-E2 image data verification kit to check original image data authenticity, whenever verification is essential.