I've had both, still use the Nikkor 500mm f4 AFS, it's the best lens you're ever likely to buy, that is unless the new one that's just been launched is even better, (if it is it must be absolutely fantastic!!!). If your budgets tight there's nothing wrong with the Sigma 500mm f4.5, resolution and build quality are very good, loses a bit if you use the Sigma 1.4 converter, not so the Nikkor with TC14E, I can't tell the difference with or without. The fact that the present Nikkor is about to be replaced will make it even more available as people with loads of cash trade them in. A top quality secondhand one shouldn't cost you any more than £3000, (don't pay any more it's a buyers market), a TC14E approx £180 to £200.
nirofo.
Last edited by nirofo; 01-10-07 at 00:43.
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