Leica M3 - 14

Whenever vertical lines cut through the rangefinde r field,
you can also meas\ire the distance by the split-image
method. This is made particularly easy by the sharp
boundary of the rangefinder field. The part of the subject
that is displaced sid~ways in this field moves across dur-
ing focusing until the image becomes continuous across
the boundary of the frame . In measuring the distance you
ha ve si multaneously set the lens ex actly to this distance .
The
functioning of the optical depth-of-field indicator in the measuring field of the com -
bined range - viewfinder :
9
O bj ects ou ts i de d ept h-of-fie ld
The double im a ge lies wi thi n the
1
-
wide upper mark: Obje ct is sti ll
re nd ered s harp at f /l6
Plane of sharp focus
,
, ,
I_ Th e double _I
image lies wit hi n th e n arrow l ower mar k:
Object is still rendered sharp at f/5 .6
53280·11