Leica R9 Instructions Manual page 132

Then:
3. Open the flap over the rear panel buttons
(1.33) downwards – it is held in place by a
magnet.
4. The plus and minus buttons (1.35) are used as
described below both to select the setting
type and also to manually set the film speed:
Pressing the left-hand minus button reduces
the ISO values, pressing the right-hand plus
button increases it or, with the highest ISO
value (12500), sets the camera to automatic
DX mode. Pressing the buttons briefly changes
the values by one step, while holding it down
scrolls through the values up to the respective
final values or the
If a film without DX coding or with damaged and
therefore unreadable DX coding is used in the
setting, or if no film is inside, the camera
uses ISO 100/21°. If you then load a film with
DX coding, the automatic scanning is active
again.
setting.
If you want to manually set an ISO value different
from the DX coded film speed, in order to
deliberately over- or underexpose an entire film,
appears in the rear panel display, along with
the warning displays
the viewfinder display. The manually set value is
the one that is valid in this case.
A manually set ISO value is retained after
changing the film even if the new DX coded film
has a different speed.
For safety reasons and to prevent the values
from being changed accidentally, the cover flap
on the rear panel should always be closed when
taking photographs.
126
(3.1, 2.2) there and in