I have a 300mm f/4D ED IF AF-S lens (not the latest edition) on my D800 and I'm looking to get a teleconverter.
My question is which one - 1.4 or 1.7?
The main use would be small birds (we make 'em smaller over here) & BIF.
I have a Sigma 170-500mm f5.6-6.3 - it works OK but the resolution is way behind the Nikkor when you magnify the image. And it struggles to focus in dim light. I guess this is because of the aperture, so I'm wary of using a 1.7x & finding the same thing.
On the other hand the extra reach would be nice.
Anyone used the 1.7x tc with the 300mm f4?