This sale is for a Mamiya 645 No. 2 Extension Tube tube is in mint condition. This tube has only absolutely minimal signs of use – barely used. The box however is in very rough condition – my dog got hold of the box while I was taking the photos of the actual tube!
This extension tube will give you 0.29 to 0.45x magnification with a standard 80mm lens; a copy of the Mamiya instruction leaflet can be downloaded from the Downloads section. I tend to use this and the #1 and #3 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.