thanks all. hope to get some better ones. they don't get too close so had a lot of misses. saw a lot of eagles but too far away for a shot. bunch of peregrines too so it is a target rich environment once it gets a little colder and they come in closer looking for food and land in trees that are closer.I am having serious lens envy as the one guy I shoot with a lot has the nikon 600 f4 and met another guy there yesterday that has a 1ds mark III and ; canon 800mm f5.6. do they make extenz for lens ?