Thank you everyone for your input.
I am new to posting to the forum but I follow the discussions almost every day. I have the Nikon D5100 with the Nikkor kit lens AF-S 55-300. My question is there any manufacturer who makes a teleconverter to fit that particular lens. It doesn't appear that Nikon makes one. I like nature photography especially shooting birds and was hoping a teleconverter would help with out a real large investment.