400L 5.6 delivered tomorrow

[bob williams]

Homer, Congrats. Though I love my 100-400, I often wish that I had made the same decision you did for basically the same reasons. The IQ of the 400 5.6 just seems to outshine the 100-400.
Regarding settings: a good rule of thumb is shutter speed at least double the focal length when hand held or moving subjects which means keep it above 800 when possible and don't be afraid to bump the iso if needed to maintain shutter speed. You can fix or improve noise but you can't fix blurry, so keep it fast. A tripod or mono pod isn't a must but will probably improve your keeper rate. My tripod did more to improve my images than did lens or camera upgrades.

Congrats again, and don't forget to share some of your new images.