I bought the D800 last September and a 24 - 120 lens. I took it to Europe on A viking cruise and took pictures in dark cathedrals at 1/15 second with fantastic results. A great lens with a very usable range!!
Check out Edit/Preferences in photoshop! I can set it to open jpgs in CR.
When you see them start to dive focus the camera on the water surface below them. Make sure you are zoomed out enough to get them in the shot. Take a burst of shots!! Then just keep on trying until you get a good one. I got a few good ones this way.
Brown pelican
Forster's Tern
This continued debate about Nikon or Canon is childish, out side of Hasselblad they are the two best manufactures (if you want every possible extra gear) and are roughly equivalent. If you have one or the other feel fortunate and stop trying to compare them!!
Along the same line I got this at a local sculpture garden
Mockingbird and sculpture
Another point to keep in mind is the D800s ability to shoot in very poor light at long shutter speeds and still get great results. I have never shot a D610, but I took pictures in a cathedral in Germany that didn't allow flash and got wonderful results with the D800 and the 24-120 FX VR lens . The picture attached was taken at 1/6 second at F/5.6 no flash leaning up against a post. Taken in raw format. I was blowing up small sections of stained glass windows with great results.
I bought the D800 last September and my D7000 hasn't made it out of the bag since. The real beauty of 36 mpixels is the amount of detail you can get with cropping. I tried shooting in DX mode for a while but found it difficult to keep birds in flight in the smaller window. Now I shoot FX all the time, crop in CS6, and just rely on the mpixels to give me wonderful detail even at extreme distances. I use the 80 - 400 all the time for birding.
Long distance flight shot of Redheads
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The new 80 - 400 allows a TC, the older model which I have does not. I have an70 - 300 also and it is a great lens, and is really 450 with the DX (D7000) crop factor.
Yes, I have a D7000 and all my lenses I bought for my old D80 work fine. FX and DX lenses work on a D7000 body!