 | EF-S lens mount, exclusively for EOS 20D and Digital Rebel bodies |
 | Superior AF performance and speed, with full-time manual focus by simply turning ring |
 | Close-focusing to 9.5 inches, fill the frame with subjects as small as 3.6 x 5.4 inches |
 | Relatively compact size and light weight for an ultra-wide zoom lens |
 | Inner focusing system (no front element rotation); length doesn't change if zoomed |
 | Circular aperture design, natural highlights, even stopped down two stops |
 | Electronic diaphragm, manually-set apertures stay constant from f/4.5 thru f/22 |
 | Excellent optical quality and true wide-angle coverage with select digital SLRs |