First announced in August 2004 to coincide with the launch of the EOS 20D, the EF S 17 85mm F4 5.6 IS USM is Canon's logical upgrade from the basic 18 55mm.Keep in mind that the Canon EF S 17 85mm f 4 5.6 IS USM Lens is an EF S lens and only works on EF S compatible Canon EOS bodies such as the 20D, 30D.EF S 17 85mm f4 5.6 IS USM Zoom Lens Electronics. . Canon EF S 17 85mm f 4 5.6 Image Stabilized USM SLR Lens for EOS Digital SLR's 4.0 out of.Canon EF S 17 85mm introduction. The Canon EF S 17 85mm f4~5.6 IS USM was announced in August 2004 as general purpose zoom for Canon digital SLRs with EF Equivalent to a 28 135mm lens, this new EF S lens brings true wide angle to tele coverage to EOS 20D and Digital Rebel shooters.