so...i picked up my AFD as a kit, with an 80/2.8. and i recently picked up another 80/2.8 in order to sell the AFD as a kit and still have an 80/2.8 in the bag, since i upgraded to the AFDIII.
i just noticed today, while packing my bag for tomorrow, that one has a smooth plastic barrel, and the other has a rubbery coating on the barrel.
my assumption is that the rubbery one is just a more recent version, but should be the same otherwise.
anything else i should know?