This sale is for a genuine Mamiya 645AF Extension Ring No. 3 (NA403) to fit all of the Mamiya 645AF / Phase One auto focus cameras. It is in really excellent condition, tested and in perfect working order.
This extension ring is in perfect mechanical and electronic condition, and you can download a copy of the Mamiya instructions from this website. Apart from that there is not a lot to say – everything works perfectly. There are only very slight signs of use on the mounting rings. Please note that no caps are supplied with this extension tube.
This extension tube will give you 0.44 to 0.59x magnification with a standard 80mm lens.
I tend to use these rings just to get a closer focus with my 150mm and 210mm lenses – it is so small that it is no problem to carry around in case you need it.