All this week I've decided to post photos taken from the kayak. For a few years I used the Sigma 135-400mm lens; on the 20D and 40D the focal length is equal to 216-640mm. Last year I upgraded to the Canon 100-400mm IS "L" lens. This is a great lens for kayaking because of the IS or Image Stabilization, there is no way to set up a tripod in your kayak. I purchased my 40D last fall so kayaking was over with for the season so I'm looking forward to using it this year. While I'm paddling I keep the lens between my legs in a waterproof bag, most of the time wildlife you see is off in the distance so it gives you time to get the camera out and get ready to snap some pictures.