Yashica CONTAX RTS Gebrauchsanweisung Seite 54
1
Q
1
2
~
5
1
Electronic Exposure Control
The
electronic exposure control of your
CO NTAX RTS
is
based
on
through-the-Iens
light reading at full
aperture.
For
light
reading
,
an
SPD (silicon
photo
diode) is
used
.
This sensor
responds to
variation of light intensity at a speed several
thousand
times faster
than the CdS
cell used
in most
SLR
s and shows
high
sensitivity
even in extremely
low
light
levels.
Light reading range
Your CONTAX RTS provides
an ext
remely wide light
reading range
from
EV
-1
to 19
(F1.4 at
ASA 100)
.
EV
(exposure value)
denotes the
value of
exposure
through combination of the shutter speed and lens
aperture
;
the
actual exposure to light of the
film emul-
sion
depends
upon the speed
rating
of the film and
the
intensity of the
transmitted
light.
For
instance,
if correct exposure can
be obtained at
EV 10 with ASA 100
film
,
the
shutter speed
must be
ad-
justed one setting
toward
a slower
speed or
the lens
apertu re
must be
opened
by one stop when
using an
ASA
50
film
;
therefore
,
the
exposure
va
lue at
ASA 50
will be EV
9 if the
light
condition
remains
the same and
,
at
ASA
200,
it will be
EV 11
.
6
7
8
9
10
II
12
H
14
15
16
11
18
19
20
2
1
22
H
24
EV
