Coupled rangefinder
System of lens focusing which combines the rangefinder and the focusing mechanism, so that the lens is automatically focused as the rangefinder is adjusted.
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Coupled rangefinder
Focusing system in which a rangefinder and the lens focusing mechanism are linked. As the lens is adjusted, the central area of the viewfinder indicates when the lens is in focus (as found on Leica M series Cameras).
Focus: Coupled rangefinder.
Film: 120 and 220, 10 or 20 6x7cm exposures.
Shutter: Electronically controlled in-lens leaf shutter.
There are two types of optical rangefinder: a coupled rangefinder has a linkage to the distance ring of the lens and lets you focus on a subject directly with the lens's focusing ring, ...
Looking at a ground glass in a view camera is nothing like using a coupled rangefinder which is nothing like looking down at a WLF finder (where the image moves opposite to the cameras motion) which is not the same as looking through an SLR with a ...
Older, non-coupled rangefinder cameras display the focusing distance and require the photographer to transfer the value to the lens focus ring; cameras without built-in rangefinders could have an external rangefinder fitted into the accessory shoe.
in the case of a coupled rangefinder, when the lens is correctly focused. SLR cameras may have a prismatic split-image system in their viewing screen. Works on the same principle as a microprism, and is restricted to apertures of f5.6 or greater.
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 See also: Rangefinder, Lens, Finder, Focus, Camera
  
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