Well this is even a bit more complicated than that. I don't use my 70-200 much and obviously it ties up alot of money. I am thinking about selling it and getting the 80-200 AFS or AF version. really only because I would like to have the extra $ to purchase some other camera gear. I have altered my TC 14e and TC 17e so I believe I could use them on the older model if needed. Anyone have any thoughts between these?