I sold the 200-400 today and a hunting a 500f4. Does anyone really know what the major differences between a ASFI vs an ASFII are besides price / weight and a minor difference in minimum focus??? I have found several AFS I's in the 4K range and an AFS II for $4600 from Bob Johnson of EarthboundLight...however it is gray and black (Canon colors?) AND it''s a Gray market although he claims it's in mint condition. A) I don't know if I could stick that thing on my camera. B) Where the heck do you get them fixed if you have a problem? Good Old Nikon USA won't repair them???