Zhumell Rangefinder RF645 - Manual (Page 17)

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3. Shooting 3-4 Exposures
3-4-3 Exposure Control Modes
The Bronica RF 645 provides three exposure control modes: the
Program AE mode, the Aperture-priority AE mode and the manual
exposure control mode. Any of the three exposure control modes
mentioned can be selected and set using the shutter speed dial.
1. Program AE mode
This is the preferred exposure control mode when focusing the sub-
ject without paying too much attention to detailed camera settings.
To set this mode, rotate the shutter speed dial, depressing the shutter
speed dial lock release button, to align "P" mark to an arrow on the
top cover. In this exposure control mode, correct shutter speeds and
lens apertures for the desired exposure are selected and set by the
camera's control system. The exposure level is controlled in extreme-
ly precise 1/12-stop increments. In the event that the photographic
subject is not well lit, special attention must be paid to the automati-
cally selected shutter speed, or blurring caused by camera shake may
result. If the illumination falls outside the metering range, both the
shutter speed and lens aperture displays on the LCD flash simultane-
ously.
2. Aperture priority AE mode
This is an automatic exposure control mode applicable to the most
variable photographic situations. To set on the mode, rotate the shut-
ter speed dial while pressing the shutter dial lock release button, and
align "A" mark to the arrow on the top cover. An f-number is then
manually set on the lens aperture ring. For a shallow depth of field to
obtain an out-of-focus background for portrait photography, select a
small f-number (a large lens opening). Alternatively, to photograph
the background in sharp focus for landscape photography, for exam-
ple, select a large f-number (a small lens opening). The Bronica RF
645 controls the exposure level in extremely precise 1/12 stop incre-
ments. Carefully observe the automatically selected shutter speed
displayed on the LCD in the viewfinder when the subject area is com-
paratively dark. If a slow shutter speed that may result in camera
shake is shown, precautionary measures should be taken such as
mounting the camera on a tripod or placing the camera on a stable
deck or against the wall, to avoid picking up such vibration and con-
sequent blurring. To compensate for an automatically determined
exposure, please refer to the articles 3-4-4 Exposure Compensation
and 3-4-5 AE Lock. If proper shutter speed cannot be selected for the
manually set f-number due to subject brightness that is out of meter-
ing range, the shutter speed display on the LCD flashes.