Dörr DCF 50 wi Notice D'utilisation page 13

AF Red Light Beam
The DÖRR DCF 50 Wi is fitted with an AF red light beam. AF reflex cameras require a minimum of
contrast for proper distance settings. In weak light conditions the available contrast of the object may
be insufficient for automatic focusing. In this case your flash projects a contrast pattern onto the object
when the camera´s shutter release is slightly touched. With the support of the AF red light beam, the
auto-focus system of your camera can now recognize structures and even in darkest rooms the exact
distance can be determined quickly and precisely. The AF red light beam covers a range of approx. 1 to
8 m. Note: Depending on the camera model it may happen that the camera´s built-in AF red light beam
has priority. In this case the AF red light beam of the flash will not be activated.
Wireless TTL Flash (only for cameras featuring W-TTL)
For many objects a lateral flash is more advantageous then frontal flashing. Illumination will be more
balanced and thus more convenient. The DÖRR DCF 50 Wi is fitted with the advanced wireless TTL
function. You can enjoy creative photography with multiple lightings from various directions. Before
starting, you should be familiar with the following details:
Master Flash: A master flash is required to control and release one or more distant flashes. Depending
on the camera model, the incorporated camera flash (Nikon) can take this function and/or a computer
flash can be mounted to the camera that is ready to fulfill the master function (Nikon, Canon).
Remote Flash: The DÖRR DCF 50 Wi can be used as a remote flash (distant and not connected to the
camera). You can use one or more remote flashes. There is no limitation on the number of remote
flashes set in one time.
Groups: In wireless photography you can assign remote flash units into any of the three groups:
A, B, or C. You can set the mode and output levels for each remote flash group.
Example:
• Flashes in group A work in normal TTL mode
• Flashes in group B work with TTL mode with 2/3 f-stop minus correction
• Flashes in group C work with manual flash and ¼ power ratio
Depending on the camera model, different numbers of remote flash groups can be controlled.
Please read your camera's user manual.
Channels: It may happen on photo shootings, that many photographers work with similar flash
technology. In order to avoid interferences, the DÖRR DCF 50 Wi offers 4 channels (1,2,3 and 4)
for wireless operation. You can use the channel of your choice for communication between master
and remote flash. However, you need to make sure that both master and remote flash are set to the
same channel.
Wireless TTL Flash with DÖRR DCF 50 Wi – How to Proceed:
1. Make sure that the slave mode switch is at OFF position.
2. Press the MODE button until the STTL icon is shows up on the LCD and continue pressing MODE
until the desired channel and group are displayed, e.g. STTL 3B. When the wireless TTL mode
(STTL) is activated, you will see red AF light blinking at the flash front.
3. Adjust the desired flash angle using the flashe's ZOOM button.
4. Now get the DÖRR DCF 50 Wi to the desired position and be aware that:
• It should not flash directly into
the camera.
• The sensor for wireless TTL flash
is not covered.
• There is no obstacle between
master and slave flash. The
sensor at the remote flash must
always be directed towards the
master flash. It is advisable to
position the remote flash in a
way that the sensor points
exactly to the the master flash.
Then you can turn the flash
reflector to the desired direction.
• The maximum wireless TTL flash
control range is app. 10m for frontal position and around 7m for lateral position of the remote flash
(can vary depending on the ambient light conditions).
• The remote flashes of one group should be position aside of each other.
• The sensitivity of the sensor for wireless TTL flash control at the remote flash can be strongly
reduced by direct sunlight. It may be necessary to protect the flash from direct sunlight using
a shade or umbrella.
5. Once all flashes are positioned properly, check the settings again. Now you can start taking
pictures.
Slave Function
The DÖRR DCF 50 Wi can be released wirelessly by an external flash source (e.g. from another flash
unit). Slide the slave selector to position S. The photo sensor is active now. Place the flash at a
desired location. The light sensitive sensor now reacts on light reflections caused by the camera's
incorporated flash or another flash and releases the DCF 50 Wi simultaneously. The TTL auto flash
mode is not active in slave mode. The flash will fire automatically with full power in manual flash mode.
Pressing the MODE button, you can reduce the flash power down ratio to 1/32.
Modern TTL flash systems are operating with pre-flashes fired in short sequences before the main
flash will fire. To ensure that the DÖRR DCF 50 Wi will fire in slave mode simultaneously with the main
flash, the pre-flashes must either be switched off or they must be ignored by the photo sensor. The
number of pre-flashes fired depends on the camera and flash model:
Approx.
5 to 7m
Master flash
Approx.
5 to 7m
Group A
>=30¡
>=30¡
Group C
Less than
approx. 10m
Group B
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