Nikon Photomic FTN Finder Gebruiksaanwijzing - Pagina 20
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EXPOSURE CORRECTION
-2
-
IYz
-
1
-
Yz
+Yz
Special Lens-Focusing Screen Combinations
Because the light-transmitting properties of some focusing
screens
differ from those of ordinary
screens,
certain lens-
screen
combinations require exposure correction to com-
pensate for the
influence
of the screen. Compensating marks
from
-2
to
+
1/2 are engraved around the ASA film speed
dial.
Correct settings
are given in the table at right.
The numbers
in
the table indicate the exposure
corrections
to be made
in
f/stops: this means you have to
stop
down or
open up the lens diaphragm
according
to the indicated num-
bers. With the Photomic
FTN
meter, however,
exposure compensation
is automatic at all
aperture
settings when the proper mark on the ASA
scale
index ring
is set
opposite the film
speed
dial. If
exposure correction
is required, line up the proper marking opposite the number
corresponding
to the film speed.
For example,
the
table
indicates a half-stop decrease (-1/2)
for the 135mm f/3.5 lens with Type
C screen.
If the film speed is ASA 100, line up the number
100
on
the film
speed
dial opposite
-
1/2 mark. When no exposure
correction
(0) is indicated,
the ASA rating for the film in use
should appear
opposite the red triangular
index.
-Measure exposure
by the full-aperture method.
-Use
the stop-down measuring method .
•
-
Neither method
will
work. With these lens-screen combinations the viewfinder can be used
only for focusing, not exposure
measurement.
Combinations represented by a blank
space
are unusable because of image darkening or con-
siderable moire over the
screen
area.
20