Chris_88 Offline Upload & Sell: Off
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I don't own any of the three lenses in question, but I have recently had the chance to handle the 500 and 600 FL. The 500 weighs only 3kg. Given that we're talking about a 500mm f4 lens, I found it amazingly light-weight and nimble. The 600 is larger and heavier, even though it feels lighter than its actual weight of 3.8 kg. I guess the question is whether you can live with 750mm f5.6 (500mm and the 1.4x TC on your D750) or need more reach (of course adding an APSC camera would help here too). If you need all the reach you can get in a handhold able package, then go for the 600mm. I guess, it depends on what you're shooting and how. For small birds, the 600mm is probably the way to go. For mammals it might be too long. The big advantage of the 400 2.8 of course is that it allows you to use the TC's and give you an 560 4 and 800 5.6.
I'd toyed with the idea of getting a 500mm prime (the old one, though), but just before I pulled the trigger, Nikon announced the D500. I want to see whether the D500 and the 200-500 5.6 will be sufficient for my needs, before I think about a big prime again.
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