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The rangefinder only depends on matching up two identical images so that they overlap.Focus is much easier to discern in low light or when using optics that have slow maximum apertures.
This system, when well designed and produced, is very superior in accuracy when focusing lenses of 50mm and wider compared to slr cameras.
While accurate focusing a manual SLR relies on the ability of your eye to distinguish sharp from unsharp, the rangefinder is much more "binary".
The image is either in or out, there is no amount of gray area as there is in an SLR.
As light levels drop the ability of the human eye to discern sharpness drops as well, making SLR's "iffy" for available light photography.
This "mis-focus" is hard to see in viewfinders that were not intended to be used for critical focusing as in the case of autofocus cameras, which are optimized to create the brightest images in the viewfinders.
While 35mm SLR's have dominated the market, and the camera bags of professional and amateur photographers alike, the M series Leica cameras have been steadily growing in popularity and are often the "personal" camera of choice for top working pros who also shoot Canon and Nikon autofocus SLR's.
They find that their favorite photographs are often taken with the camera that puts the least complexity between the user and the image.
Everyone seems to have an opinion about the Leica M series rangefinder cameras, yet so few people have actually picked one up and used it for enough time to understand the unique features and benefits that make it one of the finest tools for certain kinds of photography.
The two current models of the M6 are called the M6 .72 ttl, and the M6 .85ttl and they represent the latest in the evolution of a family of cameras created in 1953, starting with the M3. Unlike most popular professional cameras today the photographer does not view the image through the taking lens, rather, there is a viewfinder which displays frame lines that correspond to the focal length of the lens that is mounted on the camera.