Stop-down slider and depth of field
The LEICA R9 meters the exposure with the lens
diaphragm open. When the stop-down slider (1.3)
is operated, the lens diaphragm closes and allows
a visual evaluation of the focused and unfocused
areas in the viewfinder (the exposure meter then
shows incorrect values!). This is particularly
useful for close-up photographs.
In the camera’s flash metering mode
F
and,
m
and
A
- in the flash unit’s
TTL HSS
mode, pres-
sing the stop-down slider also fires the flash. The
shutter release is blocked when the stop-down
slider is pressed.
The depth of field scale for the lens shows the
range of depths of field for the set subject
distance. For example, if the Summilux-R 50 mm
f/1.4 lens is set to 5m, the depth of field at f/4
reaches from approximately 4m to 8m, at f/11
from approximately 3m to 20m.
1.3
187
11
4
