Field-test of Canon EF 24- 85mm f/3.5- 4.5 USM zoom lens. In this issue of Nuts & Bolts, the focus is on Canon's EF 24-85mm f/3.5-4.5 USM Zoom Lens, one of the most versatile, compact and affordable lens in the EF range. If you are looking for a reasonable-priced Canon zoom lens having a focal length wider than a 35mm or 28mm at the lower end, this is the lens to consider. The EF 24-85mm f/3.5-4.5 USM Zoom is very compact for a lens in its class, its overall length is about 40% longer than the EF 50mm f/1.4 USM standard lens and is smaller than a grown man's hand. It was first offered as the standard companion zoom lens for Canon's first Advance Photo System (APS) AF SLR camera, the EOS IX and come in a matching silver metallic finish as the camera's body itself. << Back to Main . 1 . 2 . 3 . 4 . 5 . 6 . 7 .