The five different focal lengths of the EF 17-35mm f/2.8L USM zoom lens can give you five separate impacts of the same subject matter. When using this lens, always aim for the best possible image angle through the viewfinder. Shown below are four photos of a building's facade shot in 17mm, 20mm, 24mm & 35mm. The EF 17-35mm f/2.8L USM lens is well worth the investment if you are looking for an ultra-high performance super wide-angle zoom lens. Text and photos by Philip Chong. Copyright 1999 by Canon Marketing (M) Sdn. Bhd. << Back to Main . 1 . 2 . 3 . 4 . 5 .