If you are going to leave the tc on the 300mm most of the time then I reckon you would be better off getting the 400mm f5.6. From the many threads I have read on this subject the bare 400mm f5.6 is better than the 300 with a tc. You can also use a tc with the 400mm which will bring it up to 560mm (AF only with the pins taped).
If, on the other hand you think you would use the bare 300mm a fair bit then that would be the way to go as you are gaining a stop. Either way they are both very good lenses.
|