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Focusing with a rangefinder — Focusing Approach
A rangefinder uses a central split-image prism; when a double image or a break in a smooth line is seen, the subject is out of focus. When the images coincide the subject is in focus.
Rangefinder focusing technology can be very accurate, with good vision and subject matter that cooperates and adequate lighting. On the other hand, rangefinder focusing is confusing on highly repetitive fine detail, and it becomes difficult when the lighting dims.
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Diglloyd Guide to LEICA contains in-depth coverage of Leica M system cameras and lenses, with additional coverage of Leica M Monochrom, Leica Q.
Special emphasis is placed on Leica M lenses and certain Zeiss ZM lenses.
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