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| p.3 #2 · Sigma 120-300mm f/2.8 OS lens & USB dock delayed |
I am at a point where I can, and have, been considering a shift from Canon to Nikon. Without going into all the details or starting a C/N war, let me just say I am not happy with my current camera for high ISO noise and find the Canon 100-400 too slow for some wildlife lighting conditions (thus forcing me up into those 'nasty' high ISOs).
I am open to going 7D MKII or D400, as well as looking at the 5D MKIII and the D600. One of the key pieces in the puzzle is how the new 120-300 performs with a 1.4x tc and a 2.0x tc (Sigma, Canon or Nikon). I have heard the current one is much better than the 100-400 and at least on par even when coupled with a 1.4x tc. One of the things I am torn on and don't know enough about is which is generally a better trade-off; using a crop sensor with a 1.4x tc or using a full sensor with a 2.0x tc? Which would generally provide overall better IQ?
I know nobody can comment on the new Sigma just yet, but perhaps somebody can comment on the current Sigma or even address this vexing question from a general perspective.