I had a chance to test out the 1D Mark IV in less than ideal light. I found a large group of eagles moving through the area. It was especially gloomy, and I\'d rather not shoot in those conditions, but this is about the end of the eagles moving through. So, I thought I\'d give it a try. Most of these were shot at ISO 1250. I probably should have gone higher because that ISO was only giving me shutter speeds in the range of 1/800 to 1/1000, and I\'d really like to have a lot faster than that. I got a nice variety of types of shots, including some with busy backgrounds. All shots were in servo using the center point expanded to surrounding points. Other focus settings were as explained in the guide on my site. These were shot with the 500/4 and 1.4x. All were wide open at f5.6.