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Focusing
1. While looking through the viewfinder,
adjust the focusing ring (30) until the
most important part of the subject ap-
pears sharp.
2. Extremely accurate focusing is sim-
plified by the split-image rangefinder
spot located in the center of the focus-
ing screen. Its wedge is set at a 45°
angle, making it possible to use either
horizontal or vertical lines of the sub-
ject for precise focusing. The split-
image rangefinder spot is surrounded
by a microprism collar which fractures
the image whenever it goes slightly
out-of-focus; consequently, it is an in-
valuable aid for pinpoint focusing ac-
curacy.
3. The outer ground glass ring (which
encircles the microprism collar) can
also be used for focusing.
Since the Mamiya M645 is an SLR, the
photographer always sees in the view-
finder exactly what will appear on the
film, regardless of the lens or acces-
sory being used.
Moreover, simply moving the depth-of-
field preview lever upward will allow
one to preview the depth-of-field and
appearance of out-of-focus images.
*
As an accessory, Mamiya offers
diopter correction lenses which can be
attached to the prism finders, and
diopter lenses for the waist-level
finder. Near and farsighted persons
will find these accessories useful for
obtaining accurate focus.
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