condyk wrote in post #6870564
Oh yeah baby ... have been considering either the Sigma or Nikon 300mm 2.8 VR. Good timing

Dave, I've heard good things about the 300 f2.8 VR. I doubt the Sig can match it wide open, at least if it's anything like the L IS. But the Sig is a strong performer, just not as strong as the OEM here.
malla1962 wrote in post #6871182
The results are just what I would expect from the canon,
Have you tested the 300EX against the 120-300?
No, but I have plenty of crops on file between them (not direct comparisons) and my impression is that they are close without TCs. With TCs, I think the prime is better, and regarding AF, I think the prime is quite a bit better (both faster and more accurate). But that's simply the copies I've used (both "DG" versions).
gasrocks wrote in post #6871189
LightRules always comes through. We just kinda expect that I guess. I had a Canon EF 300/4 L IS which I sold when I Got the EF 300/2.8 L IS. Emergency came up and I had to sell that. I hear good things about the Sigma and Tokina versions. I now have a Tamron SP LD IF 300/2.8 AF model. It is wonderful - especially for the price. Even takes TCs well - ok, not as good as the EF but nothing can beat that.
Gene, how is the Tamron 300 f2.8? I assume the AF is somewhat slow? Accuracy? At least compared to ring - sonic units.
CountryBoy wrote in post #6871209
Thanks for the comparison . I've been thinking of the 300mm L , instead of the 400mm 5.6L.
CB, 300 f2.8 or 300 f4? I have both currently and am going to add the 300 f4 IS and 7-2 f2.8 IS compared to the Sigma 300 f2.8 shortly. I'm looking at the pics once I finish typing this sentence...