Yes-I've used all the Kenko extension tubes and the Canon teleconverters in different configurations with the 100-400. It's more than enough magnification. In fact, if you put the entire Kenko set on there, the minimum focusing distance is actually inside the lens. Using extension tubes with a zoom lens can be very confusing, because the minimum focusing distance increases as you zoom in. So, you have to fight the natural instinct to zoom in on something to increase magnification. Here's a crop of a photo that I took handheld with extension tubes:
http://www.northrup.org/photos/Animals/nl-8.htm Not a great picture, but proof of concept nonetheless. And my comments on the extension tubes in general: http://www.northrup.org/equipment/extension.htm Tony -----Original Message----- Where extension tubes do make a difference at 400mm is minimum close focus distance. I find even 12mm to be useful when shooting such subjects as birds & butterflies, & will use anywhere from 12 to 50mm extension with these subjects, sometimes in conjunction with a 1.4x Canon converter. I don't find this makes the set up any more clunky to handle than it already is. OTOH, I'd agree that trying to shoot anywhere close to 1:1 with the 100-400 & extension tubes sounds like a real exercise in futility, particulary when there are so many better options. * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
