« on: April 07, 2012, 12:41:21 AM »
The 5DIII's AF [...] it's still not as snappy or responsive as even my ancient 1DII.
With all due respect, I must disagree here. What lens(es) are you using and what AF settings when you say that the 5DIII is not as snappy or responsive in autofocusing as the 1DII?
With my 24mm f/1.4 L II, 85mm/100mm f/1.8 / f/2.0, 70-200 mm f/2.8L II, 135mm f/2.0L, and other fast-focusing lenses, I find the AF to be more snappy and responsive as the best bodies from both Nikon and Canon that I have ever used--until now this does not include the D4, which, together with the 1DX, would be the only camera more responsive than the 5D3. With a lens like the Tamron 60mm f/2.0 Macro for Canon, on the other hand, AF is not as "snappy," but here the culpability lies with the lens rather than the body. (That lens is excellent, by the way--it is just noisy and slow due to its not being equipped with the latest silent focusing motors.)
And the low light EV -2 sensitivity of the 5D3 is absolutely for real, not a marketing gimmick. I was shooting in theatre/jazz production Thursday evening and had no problem focusing anywhere in the dark theatre--and I'm not talking about the stage, but about the audience. Starting with ISO 25K, f/1.4, 1/10th of a second and even darker than that--it could nail focus like magic. It was necessarily to precisely aim the selected focus point at the subject, but it was easy and felt nearly too good to be true.