billnikon wrote:
You own a Nikon D810 and a D4, a 24-70 and a 14-24, so obviously you have quality equipment. Why would you even consider? ............ you know! My suggestion would be the NIKON 200-500 F5.6 lens ($1400.00), I own this lens and use it all the time with great results, both your camera's can use GROUP AUTO FOCUS, I would further suggest using the center spot, Nikon then picks the four focus spots around it, this focus mode is great for birds in flight because as long as one of the 5 focus spots (Nikon will only show 4, it does not show the center spot) are on the bird the camera system eliminates any back ground and your bird are in perfect focus. The only other lens I would consider is the Nikon 200-400 f4, this lens is heavy and expensive, but as you already know because you own the D810 and D4, YOU GET WHAT YOU PAY FOR. Enough said, you have been warned.
You own a Nikon D810 and a D4, a 24-70 and a 14-24... (
show quote)
I agree with Bill! You seem to have invested almost 10 grand in camera bodies alone and now want to skimp on the purchase of a super zoom.