I drove up to Crown Hill Nature Park Sunday and took the big telephoto lens. I may have arrived a little late in the day, Noon, but I spent an hour walking around the lake. It was cool and overcast all day; it didn't reach 60F today.
I went birding in Belmar Park in Lakewood Colorado early Saturday morning. I took the new telephoto lens and spent about an hour circling the park.
The telephoto is a little heavy at 4.5 lbs - add the camera and it's 6 lbs! I used auto focus part of the time but found manual focus to work better in some situations. Focusing on a small bird in a tree can be a little tricky; auto focus may be able to focus on the tree but not the bird and birds don't stay in one place for very long.