A few years ago I acquired a "like new" 600mm f/11.5 KangRinpoche (I think that we can all agree that it was a clone of the FUJINON) lens in a Copal 3 for my 11x14. Cost was easily a third of the cost of a used 600mm FUJINON. I have yet to have it run out of coverage on my 11x14, no matter how extreme my movements are. Sharpness is all that I could ever want. I also have yet, and most probably never will, to have someone come along and comment that the optic is not the classic 600mm FUJINON.