Pentax 645 - FOCUSING PROCEDURE

FOCUSING PROCEDURE
View the subject through the viewfinder, and rotate
the focusing ring of the lens. Focusing is possible in
three ways; using split-image, microprism, and/or
matte field. With the split-image method, the
focusing ring should be rotated until the upper
and lower image halves are perfectly aligned.
When using the microprism collar, control
focusing until glitter vanishes within the collar
area. In the case of the matte surface, focusing
should be adjusted until the image becomes sharp
and crisp. At times, when the maximum
aperture of the lens in use is limited in f/stop
capability (less than f/5.6: example, f/8), the
split-image or microprism collar may not render a
satisfactory focusing view. In this event, the use of
the matte field is recommended; or, an appropriate
interchangeable focusing screen 645 (separately
available) can be used. (Refer to P-62 for further
details concerning this particular use.)
In focus
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