From everything I've been able to read the 70-200VR is quite a lens. I have the 80-400Vr mainly for bird photos, which gets me out there to about 600mm at the long end. I'm concerned that with the 70-200VR even at the long end I'll only be somewhere around 300mm, which isn't alot of reach when shooting wild life. My hope is that the 70-200VR is good enough that I can crop the photo and end up with close to what I would get using the 80-400VR at the 400 end. Any thoughts?