I hate this lens.  I can not focus it at all.  It seems to ALWAYS be out of focus.  It looks in focus in the viewfinder, but the files are always blurry.  I have not tried it with any of the stop down plates, because I don't want to shoot it closed down.  Supposedly this lens is very special. :(  I have let some of my friends borrow it and they are always stoked on it.  It gets great reviews and then I go to use it and every time I pull it out of my kit I regret it because it becomes a huge waste of time.  Maybe you know some sort of magic spell, or you have some sort of magic touch.  If so, go ahead and be my guest.  I hope it yields you some beautiful images.  All the step down plates are included, along with the damaged box, instructions and some other junk they throw in there when you buy it.  The glass elements are all flawless, and the focus wheel feels nice.  Maybe something is just out of whack.  If you know how to repair lenses then maybe that is all it needs.  I purchased this lens at LA Samy's June 3rd 2016 for $675 with tax.  What a WASTE of money.  I hope this lens serves you well.  Know up front that I disclosed that this lens is a pile of junk, buyer beware.