This is the Canon EF-S 17-85mm f/4-5.6 USM standard zoom lens:
Sample Photos
Official full-resolution Canon 30D image sample from Canon Japan:
You can view the other 5 Canon 30D samples here.
Accessories and add-ons
The EF-S 17-85 IS USM takes 67mm filters. Recommended filter brands are B+W and Hoya.
Resources
Official Canon EF-S 17-85mm f4-5.6 IS USM page at Canon USA.
Related
Canon Lenses – Main page