[Tord555]

The pricing is staggering. I wonder what the thinking is? No-one will buy this for kids sport, which is the niche that you might imagine a smallish sensor camera with good continuous tracking might carve out. But serious hobbyists are unlikely to bite because they tent to care more about IQ than the images they take (sometimes guilty of this error myself) Maybe some kind of semi-professional sports or wildlife photographers for whom the price of a 1dx or D4 and associated super teles is out of bounds? You might get the shot, and the quality would be OK (and the DOF is going to be thin enough at 800mm equiv. even at the slowish aperture). But this is surely not a huge market!

Having two 70-300CX in the house tells all, doesn't it?! It is far beyond any other modern 70-300 lenses I've used in sharpness, not least in its long end (outclassing my 80-400 VR II easily, a at least twice as expensive lens, to my dismay, so that is now sold).

 

I have never found any problems shooting with them at 300mm (not worse than any other 300mm lens), as DOF is governed by actual focal length, not equivalent focal length.