This item was recently posted with little info. and few responses. It is an AP Traveler EDT/EDF F6 field flattener in mint condition. Today I contacted AP and they cleared things up for me. This is a model they no longer make, AP67PF46. It is a single element flattener good for CCD or conventional photography. AP said they carry accys./adapters to use it with all the major conventional and CCD cameras. It is the model that Tony Hallas took many of his Traveler images with. Price is $250 or best reasonable offer.