Several years ago having been relatively uninterested in wildlife photography my interest peaked when I became aware of the winter migration of the Bald Eagle to our area. Not wanting to spend much I opted for the Nikon 70-300mm VR. I was able to get some good shots when I was able to get close enough. When the birds were distant cropping the image lacked the sharpness I am use to with portrait primes (Portraits have been my primary interest). At 200mm and under the lens is plenty sharp but at 300mm I can't crop with good results. As a result I'm considering (and saving for) two lenses: 70-200 VR ii, and 300mm f4 afs both to use with tc-14 extender for wildlife. I can use the 70-200mm for upgrade with low light events, full body portraits, etc. But the 300mm f4 is probably better for wildlife. My conflict is I'm not sure which or if there are options I'm not aware of. Your thoughts and experience are greatly appreciated.