This is off topic, so if you would, please email me privately at: jerryols@badlands.nodak.edu I'm about to buy either a Sigma, Tokina, or a Canon 17-35mm Wide angle zoom lens. Does anybody know which lens is The Sharpest, or is there little difference? Does anybody know if either the less expensive brands are as sharp as the CANON 17-35mm? and Lastly, does anyone know of a reliable website for Cameras and Lenses? The B&H is a great store, but was wondering if these lenses, especially the Canon, could be had for a better price elsewhere? Jerry - Please: Stay on topic. Trim quoted messages. http://www.leben.com/lists for list instructions.