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Closed
aperture light measuring
Mesure de la lumiere
a
diaphragme ferme
In
ordinary situations, the open aperture
light reading is
more convenient as
it
enables
bright
viewing
of the
subject area and
also
effectively provides against inaccuracy of
light
measurement resulting
from
strong
backlight entering
through
the
viewfinder
eyepiece.
Nevertheless, closed
aperture
light
reading
is necessary in
photomicrography or when
using lenses
of
undeterminable
f-number.
The method of closed aperture light reading is identical
with any
type
of
lens
used.
1.
Adjust both
the
lens
selector
dial
and diaphragm setting
lever
of
the
camera
to
f/1.4.
2.
Stop
down
the
lens
to the
required aperture and match
the needles
by
turning
the shutter speed
dial.
3.
Take every
precaution against
backlight
entering
from the
viewfinder eyepiece.
Because
the
light
transmitted through the
lens
in case
of
closed
aperture
light
reading
is
often weaker than
the
backlight,
error
in
exposure
reading is liable to
occur.
To prevent errors in
light reading, therefore,
the use of
the eyecup
is
recommended.
L'on preferera, en generol,
10
methode de mesure de
10
lumiere a diophrogme ouvert, etant donne que
celie methode permet d
'
avoir une
imoge
de viseur cloire,
et
que
10
lumiere
entront
por I'oculoire du viseur
n'influence pos
10
mesure
.
Lo methode de mesure de
10
lumiere a diophrogme ferme devro neanmoins
etre
utilisee lors de micro-photographie oinsi que lors de I'utilisation d'objeetifs dont
10
luminosite n'est
pos connue
.
Lo methode reste
10
meme pour tous les objeetifs utilises.
1.
Plocer Ie levier de reglage du diophrogme oinsi que
Ie
seleeteur d'objectif
sur
1,4.
2.
Regier Ie diophragme sur
10
voleur
desiree et oetionner
Ie
bouton de reglage des
vitesses jusqu'a
superposition
des aiguilles dons Ie viseur.
3.
Eviter toute entree de lumiere por
I'oculaire
du
viseur.
Lors de
10
mesure de
10
lumiere
a
diophragme
ferme,
10
lumiere
entrant
per I'oculoire P'lut influencer
10
mesure de
10
lumiere
.
II
est
recommende
d
'
utiliser un oeilleton
.
17
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