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LA PROFONDEUR
DE
CHAMP
:
Ouand
la
mise
au
point
est
r6alis6e
sur un
sujet
bien
particu-
lier, les
plans
en avant
et derridre
le
sujet
seront suffisamment
nets. C'est
ce
que
I'on
nomme la
profondeur
de champ.
Celle-ci
peut
6tre calcul6e selon les
proc6d6s
suivants:
l. Tout objectic
est muni d'une
6chelle de
profondeur
de
champ.
Par
exemple,
avec
une
distance
appareil-sujet
de
3
mdtres
et un r6glage
d'ouverture du diaphragme
de
tl16, la
zone
qui
se
trouve
entre les deux indications f/16
de
l'6chelle
de
profondeur
de champ de l'objectif
(eviron
2
d 8
Mdtres
ou
6,6
ft.
a
26,3 ft.)
Correspond
d
la zone
de
nettet6.
(Figr
38)
SCHARFENTIEFE
Beim
Scharfeinstellen
eines
bestimmten
Motivs
erscheint
ein
gewisser
Bereich von
und hinter
diesem Motiv verhiiltnismd-
Rig scharf
im
Bild.
Dieser Bereich wird
,,Schdrfentiefe"
gen-
annt.
Die
Schdrfentiefe
kann wie
folgt bestimmt werdbn:
1. Jedes
Objektiv weist eine
Schdrfentiefenskala
auf. Bei
einer Entfernung von
3m und Arbeitsblende
von 1:16
ist
zum
Beispiel
der Bereich zwischen
den
beiden
Skalenmar-
kierungen
,,16"
(ungef6hr
2
-
8
meter)
scharfeingestellt.
(Abb.38)
;
#*lr
&
-#
I {n.
..Fi.
t:-.;!*
&-*;@";*-r
4?
www.butkus.us
23


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