Rodolfo Paiz Offline Dedicated FM Upload & Sell: On
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p.1 #16 · Sigma 300-800 vs Nikon 800 5.6 vs? | |
I wouldn't try to do MF while tracking a moving subject on the water, but that's just me. If you have the cash to buy the right stuff, and you really want that reach, then I'd first get a D300s with grip for the better balance, frame rate, battery life, and ergonomics. Try out the 200-400 with 1.4x and 1.7x TC's, since it'll now become a the equivalent of a 420-840/5.6 (1.4x) or a 510-1020/6.7 (1.7x).
I probably put at least 60,000 clicks through a D300 with the 200-400 lens, and it's an awesome combination. In low-ISO daylight, and if you need the reach, then the D300s will give you most of the image quality that you get from the D3. But when you factor in the use of lower-power TC's and less cropping, the overall IQ you get from the DX body will probably exceed what you're getting now from the D3 with 2x or stacked TC's.
After you've tried that, if you still want more reach, rent a new 600/4 VR for a week and try it with the 1.4x TC (1260/5.6 equiv.) or the 1.7x TC (1530/6.7 equiv.).
The AF performance on any of the combos I've described, especially the AF tracking, will absolutely humiliate what you're getting at f/8 or smaller with the 2x or stacked TC's. Which will become even better and easier when you notice that the 51 AF points cover a much larger part of the frame on the DX sensor, making subject tracking a joy. In the end, if you need more reach than that, then by all means go back to the naked 200-400 on the D3, and shoot from a bloody boat.
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