PETRI MF-1 MICRO Mode D'emploi page 14

14
SHOOTING AGAINST THE LIGHT
When the li9ht source is behind your subject or your
subject is considerably darker than the background,
it is recommended, to compensate the reading
found. The procedure is the same as mentioned
under "Under- Exposure". Use a lens opening 1/ 2 or
1 stop wider than measured.
VIEWFINDER AND FOCUSING
What you see in the center of the viewfinder is the
" PETRI FAIL-SAFE" focusing device.
Looking through the micro-prism area
(e)
in the
viewfinder, you see the subject clearly, only when
the lens is in perfect focus. Rotating the focusing
ring you will notice the appearance of a grid in the
center of the finder. As soon as the subject is cor-
rectly focused, the flickering grid fades away. The
circle around the cluster of micro-prism (8) is plain
glass, here the subject is always seen sharp and
clear, even when the lens is out of focus. When the
lens is correctly focused, the images in the micro
prism area and the outer circle (A) will be equally
clear.