for the cost of a full set of AF kenkos, Dianne, you could always just splurge for a 60 micro (just trying to give you incentive to buy! Lol) sorry i dont have more time or else i would comment on the choices you aregoing between, i have seen wonderful from both and idont think you could really go "wrong" myself, given this decision, i would get the tubes. I do not have them but the research i have done, when the money avails i will get the tubes. they can also be used in other lenses to get just a little better close focusing distance, but they wont focus to infinity, remember. i really dont know too much about either.