Title pretty much describes this item. Near mint in near mint Pentacon box. I no longer have the Pentacon Six, so this needs to go to a home where it will be used. It attaches to the eyepiece on the prism and provides a 2.7X magnification and an adjustable diopter correction ranging from -4 to +5. If you need one, you won't find one in better condition. Money cheerfully refunded if not as described. Can send photos upon request either to your email or smart phone. $65 including insured shipping in the USA. Overseas shipment possible at additional cost. Bill Barber (nsurit on eBay)