Tried out the Teleconverter TC-14EII on the new lens, gives 700mm but you lose 1 stop so your F4 becomes F5.6 min. which is okay if you have lots of light, Kingfishers on pictures are quite far away but low light also as you will see, so may stick with standard 500mm giving me more light at F4 and put converter on if needing that extra reach, we will see, did get some nice pics but nothing new about at the moment.
