PME 3/PME Meter Prism Viewfinder
Adjustments
Since the Hasselblad Meter Prism Viewfinders
measure the light level
on
the focusing screen
they have been calibrated at the factory to give
an
accurate reading with one particular type of
screen.
If
that focusing screen
is
replaced with
another type which gives a different light level
under the same ambient conditions, the meter
has to be adjusted to compensate for the differ-
ence.
The
PME 3 and PME meter viewfinders are
basically the same design but are differently
adjusted from the factory. The
PME 3 type
is
adjusted to the brighter Acute-Matte
t
screen
in
the 503cx camera while the previous PME type
is
adjusted
to
the lower light level of the Ground-
Glass screen (Cat. No. 42161) and similar,
comparable screens, such as Split Image
(42188), Central Grid and Split Image (42218),
Checked and Central Grid (42250) and Fine Line
(42285). The Plain Glass Screen (42200)
is
not
suitable for
TTL
measuring.
The distinction between the two viewfinder types
is
indicated
by
the designation PME 3
on
the rear
of the viewfinder body above the eyepiece. The
PME has
no
designation.
The ways of compensating for alternative usage
of the meter viewfinders are shown
in
the charts
on
the next page.
t Acute-Matte designed by MINOL TA.
23
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