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Focusing
According to your predominant photographic work you will have chosen between 3 permanently built-in viewfinder screens.
The image is focused by rotation of the distance setting ring (13) on the lens.
a)Screen with split-image wedge
This screen is particularly suitable for quick focusing with wide-angle and standard lenses. Unless focusing is critical, edges and lines of the object are mutually displaced in the horizontal split image.
A ring-shaped quadrangular micro-prism
screen surrounds the central split image. This serves for the focusing of objects lacking crisp outlines. Out-of-focus setting is indicated by distinct flickering.
The surrounding field consists of triangular micro-prisms, producing a ground-glass screen effect. This surrounding field is therefore used mainly for focusing with longer-focal-length lenses and in the close-up range.
