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The rangefinder
The measuring field of the rangefinder
appears in the centre of the viewfinder as
a bright, sharply outlined oblong. If you
block the large field window (15) of the
viewfinder, only the reflected bright-line
frame and the measuring field remain
visible. Focusing can be carried out
according to the coincidence or to the split-
image method.
Coincidence (double image) focusing:
in portraiture, for instance, focus on the
highlight in the sitter's eye. Observe the
subject through the viewfinder and rotate
the lens until the double contours in the
measuring field coincide.
Split-image focusing: Sight an edge or
any other clearcut line; if you find that this
line is offset sideways as it enters the
measuring field, rotate the lens until the
line becomes continuous as it passes from
the viewfinder- into the measuring field and
out again. This method is to be preferred
because of its superior accuracy.