Canon interview: the end of the DX pro line

Well, Kerry, but if you already wanted/needed to use a 1.4x TC with D300? It is not uncommon for me to use 1.4x TC with either my Sigma 120-300 f2.8 or 100-300 f4. The 1.4TC doesn't degrade image quality to a noticeable degree. However, to get comparable reach on D3s one would need a 2x TC. But unlike 1.4x TC, 2x TC does degrade image quality and I tend to avoid using it. So, this is still not a perfect solution, not even a particularly good one, at least in some instances.