U.M. 2

El-(eXam Ple)
Programmed AE
mode
either
of
the two blinks
Use fl
as h or
higher
ISO/
ASA rating
film,
Shutter -speed priority AE mode : Wh en 2 sec,
is set on the shutter speed selec
tor dial and a
number equal to
or smaller th an the len s' m ax i-
mum aperture blinks; or
Programmed AE mode: When the lens' max-
imum aperture blinks,
you can
a) Use flash or other additional light;
or
b) Use a film with a higher ISO/ ASA
rating,
With the shutter button pressed halfw ay, a red " M"
LED 4 appears whenever you remove the aperture
ring of the lens from " A" or when you mount a non-
FD le ns , See pp , 57 -58 , It warns yo u that exposure
will
not be automatic,
41
14. Exposure
Taking a picture is a matter of letting light fall on
the
film under controlled conditions, This is
called exposure, When you press the shutter
button , some blades (called a diaphragm) inside
the lens
shift to form an opening called the aper-
ture,
Almost simultaneously, the first shutter
curtain starts to move inside the camera, A
second
shutter curtain follows it after a fixed
interval
which you control with the shutter
speed selector dial. The amount
of light that
exposes a frame depends on the shutter speed
and the size
of the aperture,
For the same exposure, a change
in the shutter
speed requires
an equal and opposite change in
the aperture, The AE-l PROGRAM makes this