Variable
Sensing
Spot
Angle
de
mesure
variable
EI
punto
sensible
variable
Die
veränderliche
Messßäche
2Smm
(1
0°
1 0')
35mm
(
SO
10')
50mm
( 5°40')
----
135mm
( 2°
13
')
----
400mm
(45')
----
SOOmm
(23')
When
using a wide angle lens, a\'erage light reading
is
more effecti\'e, while with tele photo lens spot
reading
is
aprerequisite.
In the Sensorex system, the use
of
a wide ang
le
lens automatically sets
the
meter eloser to a\'erage reading, while on the other hand the use
of
a telephoto lens decreases the area
and angle
of
the sens
in
g spot
to
enab
le
most accurate spot reading.
When
the lens
is
int
erchanged, the light acceptance angle
of
the exposure meter changes auto
mati-
cally. Since however marking
of
this variable sensing spot on the screen
of
the finder would impair
elear \'iew,
th
e actual area
is
not
indicated (See illustration for the area
of
the sensing spot when
lenses
of
different focal lengths are used).
With
any type
of
lens,
see
that
the main area
of
the subject (The face in
ca
se
of
portraits)
is
centered
in the
mu
l
ti-m
icroprism focusing spot.
Aim the camera slightly downward when taking exposure reading
of
an open landscape,
This
wi
ll
prevent the bright li
ght
from the sky directly entering the sensing spot and causing under-exposed
results.
19
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