Nikon F3 Manuel d'instruction - Page 38
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Focusing Screen Selector Guide
Type
A:
Mane/Fresnel
field with
3mm¢ circu
lar split -image rangefinder spot
and
12mm¢ reference circle. Rapid and accurate focusing. Excellent
for
general
photography.
~
Type
B:
Mane /Fresnel
field with 3mm~ fine·
ground
mane
focusing
spot and
~
11mm~
reference circle.
Good for general
photography. especially with long
lenses
D
Type
C:
Fine-grou nd matte field with 4mm¢ clear
spot
and cross
hair.
For
photomicrography, astrophotography
"
and other high-magnification applications,
using
parallax focusing on aerial
images.
D
Type
0: Overall fine-ground matte field.
For
specialized close-up photography and
for use
with
long lenses.
~J
Type
E: Matte/Fresnel field
with
3mm¢ fine-ground mane spot, 12mm¢ reference
circle
,
and etched
horizontal
and
vertical
lines.
Ideal for architectural photography.
Type
G:
Clear
Fresnel field
With
extra-bright 12mmcp mlcropnsm focusing spot for
viewing and focusing
in
poor
light.
Four
models
(Gl-
G4) are available corre-
sponding to specific focal length lenses. Depth of field
cannot
be observed.
Type
H:
Clear
Fresnel field with microprism focusing pattern over the entire screen
area.
Permits rapid
focusing
on any part of the
screen
with optimum
edge
-Io-edge
brightness
in
poor
light.
Available
in
four
models
(Hl-H4
)
corresponding
to
particular
focal
length lenses.
Type
J:
Matte
/Fresnel
field
with
central microprism
focusing
spot and 12mmcp
circle
.
Good
for
general
photography.
[~
E8
+-1-
4
-+4
!-.+e+t
+·-+f--"t,
Type
K: Combination of Type A and
J
screens. Matte/Fresnel field with
3mm¢
split
-
image rangefinder
spot
surrounded
by
1
mm-wide
microprism doughnut.
Rapid and
accurate
focusing for subjects
with both
straight lines and ill-defined contours.
Suitable
for
general
photography.
Type
l:
Same as Type A screen bul
with
split-image rangefinder
line
at a
45°
angle.
Best for
subjects
with
horizontal
lines.
Type
M: Fine -ground Fresnel field with 5.5mmcp clear spot
and double cross
hair for
use
in parallax focusing
on
aerial
image,
plus
millimeter scales
for
calculation
of
individual magnification of objects or for measuring objects. Brilliant
image
in dim
light. Suitable for close-ups, photomicrography
and
other high-magnification
applications.
Type
P:
Same as
Type
K but with split-image rangelinder line at a 45° angle and
etched
horizontal
and vertical
lines
as an
aid to
composition
.
Rapid
and
accurate
focusi ng for
subject
with
hori
zontal
or
vertical lines or iii
-defined contours. Suitable
for general
photography.
Type R:
Same as Type A but with rangefinder prisms of sloping
surfaces
at
a smaller
angle and
horizontal and vertical
lines to aid proper composition
.
VoJorks best
with
lenses
having maximum apertures
from
f/3 .5 to
1/5.6.
Type
T:
Matte /Fresnel
field with split-image
rangefinder,
12mm¢ reference circle,
and
horizontal
and vertical
lines.
Used
when
preparing slides
lor
TV
broadcasts.
Dotted
lines indicate
standard
TV
screen
format.
Solid outline shows
"
safe action"
area,
whereas broken
lines indicate "safe
title"
area
Type
U:
Matte/Fresnel field with
3mm¢
fine-ground
matte focusing
spot and
12mm¢
reference circle. Utilizes the
same
matte field as
Type
S,
but with lenses
longer
than
100mm the
image in the viewfinder
is
easier to
see.
With shorter focal-
length
lenses, this screen is not suitable because of light fall-off
in
the corners
.