9VIII said:The deal is that the 400f5.6, as-is, nearly performs as well as all the V1 Big Whites. That seriously devalues a lot of hardware. They made V2 Big Whites to rectify that, but from an amature's perspective the main thing missing is still just IS, the competition for IQ is still close enough.
Even without adding IS, look at the 100-400MkII VS the 400f5.6 when both have a 2XTC, the zoom still sucks.
The comment about the 400/5.6 vs the 100-440mm II is simply untrue. With the 2xTC the 100-400 II is actually sharper in the centre than the 400/5.6, and you don't put a 2xTC on these lenses to capture the extreme corners - you do it for small subjects in the centre.
http://www.the-digital-picture.com/Reviews/ISO-12233-Sample-Crops.aspx?Lens=278&Camera=453&Sample=0&FLI=4&API=2&LensComp=972&CameraComp=453&SampleComp=0&FLIComp=6&APIComp=2
I wouldn't use the 2xTC on either of these lenses under normal circumstances. Using the 1.4xTC, which is much more usual, the 2 lenses are pretty much the same. If the 400/f/5.6 performs nearly as well as the big whites then so does the 100-400mm II!
http://www.the-digital-picture.com/Reviews/ISO-12233-Sample-Crops.aspx?Lens=278&Camera=453&Sample=0&FLI=3&API=1&LensComp=972&CameraComp=453&SampleComp=0&FLIComp=5&APIComp=2
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