I just got my first dSLR last week, I got the 40D, I love it so far. I got it with the 28-135 IS lens. I am got the new camera because I am going to Yellowstone soon. I was looking for good ideas on the lens or lenses to take in addition to what I already have, I bought the 50mm 1.8 and 55-250mm IS. I was thinking the 100-400 L series IS lens with the 2X converter, will the converter hurt my image quality alot or will I need to get good shots of wildlife that is far away, I am thinking of renting since a good telephoto lens is out of my price range right now, here is my duck picture, lots of ducks. Thanks for any help, I really like this site already.