Pentax 645 - VIEWFINDER AND FOCUSING; DIOPTER ADJUSTMENT

DIOPTER ADJUSTMENT
The eyepiece is equipped with a diopter adjusting
ring. Accurate focusing of the viewfinder image
becomes possible only with the diopter adjusting
operation.
1. As illustrated, the diopter adjusting ring
possesses a diopter adjusting index. Whenever
the arrow indications of +and— appear at the
top, it indicates that the ring is positioned at -1
dioptry. If far-sighted, rotate the diopter
adjusting ring in the direction of the arrow
for the + marking to the left side. However,
should you be near-sighted, the diopter adjusting
ring must be rotated for the — marking to the
right side.
It is recommended that the diopter ring
adjustment be performed prior to a shooting
session to fit with your visual requirements,
avoiding adjustments during picture taking.
2. To adjust diopter, as illustrated, direct the
camera to face a bright/plain color background;
then, rotate the diopter adjusting ring to a point
whereby the border-line of the microprism and
matte field can be seen most clearly. Adjusting is
generally made easier when the focusing screen
image is blurred or out of focus.
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