Dear Mr. Reichmann:
A few years ago you wrote an article in which you compared the Canon 500 f/4 EF L IS lens to the Canon 600 f/4 EF L IS. After extended use of both lenses, you concluded in that article that the 500 f/ EF L IS lens was a better compromise from the standpoint of weight, portability, and optimizing use of the lens. The high quality of the two lenses was a draw. At this point, I own a 500 f/4 EF L IS, which I use for wildlife photography and motor sport (American LeMans Series) photography. Do you still feel that for overall use, the 500 f/4 EF L IS is a better compromise? Having just photographed some bald eagles in the Grand Teton National Park two weeks ago, I had the feeling that a little bit more reach would have been desirable, but the extra weight of the 600 f/4 EF L IS is a factor that cannot be ignored. Maybe the answer is simply to "zoom" a little with one's feet.
Best regards,
Roman