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In a few weeks I will be headed to Yellowstone with my son to participate in a week long photography workshop. I will be bringing my 60D and 6D. My son will bring his 7D. In my kit I have a 17-40, 24-105 and 100-400. My son will bring his 15-85 and will rent a 100-400. He is debating about renting the 10-22 and perhaps the 1.4x EF Extender. With the crop factor of 1.6 he will be shooting at 24 mm with his 15-85, we think this is probably alright for most of his landscape shots.
Now for wildlife we wondered about the extender on either one of our cameras. Does anyone have any thoughts about how well the 1.4x will work on either the 60D, 7D or the 6D? I've heard, from someone at a camera store, that the 100-400 auto focus will do a lot of hunting when attached to my 60D but I'm not sure of what type of results we would get on his 7D or my 6D. The 1.4x EF Extender can be rented from Lens Rental for around $50, so we thought it might be worth the chance to try it out on this type of trip. I would appreciate your thoughts on your experience with the 1.4x on either a crop or full frame camera. Thanks for your time.