Vivitar 2X Macro Focusing Teleconverter for Nikon F  type_Projectors RAFcamera's listing with more information

RAFcamera's listing with more information is here

This is the 3-cam version

There's no autoexposure

The Mamiya FD701 slips onto the eyepiece of a Mamiya RB/RZ prism viewfinder and provides a magnified view for precision focusing

though collectors take note: the original decayed focusing ring rubber has been replaced with good quality diamond-textured rubber material

Vivitar 2X Macro Focusing Teleconverter for Nikon F &nbsptype_Projectors RAFcamera's listing with more informationThe Vivitar 2X Macro Focusing Teleconverter MC is a 2x teleconverter with a neat trick: it's also a helicoid that allows closer focusing with any lens. In good condition, with some cosmetic wear, clean glass.