The Varifocal Viewfinder is designed for use with 28mm – 135mm interchangeable Nikkor rangefinder lenses.
How to use: Slide the finder into the Nikon rangefinder camera’s accessory shoe. Set the indicators of the scale on the body of the finder according to the focal length of the lens being used. Focus the lens then set the parallax adjustment scale at the viewfinder base to match with the focus distance shown on the barrel of the lens. This near new example comes with original brown leather carrying case, instructions, inspection card and maker’s blue velveteen box.