So after my outing with the 200-500 and the D5, I really wanted to give the lens a try on the 810. Where-as I didn't find loons, I did run into a family of mallards. Here are a few. This lens continues to impress me. Even if it cost $2500, it would be a great buy. Considering it costs half of that makes it a steal. #1 #2 #3 And since you looked at this thread, I'll throw in a bonus eagle #4 As always, C&C is welcomed.