Flash Range Indication; Automatic Adjustment Of The Flash Range Indication; Manual Adjustment Of The Flash Range Indication; Fe Flash Exposure Storage - Metz MECABLITZ 58 AF-2 digital Manual De Instrucciones

15 Flash range indication

A F 4.5
14 m
AZoom 70
14 m
most photographic situations. Strong deviations from this reflection factor, as in
the case of highly reflective or poorly reflective subjects, may affect the flash ran-
ge.
In TTL-, E-TTL and automatic flash mode, the subject should be in the middle third
of the indicated range. This will give the automatic exposure control sufficient
scope for compensation.
To avoid overexposure, the minimum distance from the subject should be no less
than 10% of the indicated value. An adjustment can be made to a particular
photographic situation by changing the aperture setting, for example.
In manual flash mode M, the distance that must be maintained from the subject
for correct flash exposure is indicated. An adjustment to the photographic situa-
tion at hand can be achieved by, for example, changing the aperture setting on
the lens and by selecting either full light output or „P" for a partial light output
level.
☞ The flash range can be expressed in either meters (m) or feet (ft) according to
the chosen setting (see 7.8). There is no flash range indication in remote
mode or when the main reflector is swivelled or tilted.

15.1 Automatic adjustment of the flash range indication

Cameras transmit to the flash unit the flash parameters for ISO film speed, focal
length of the lens (mm), aperture and exposure correction. The flash unit auto-
matically adjusts its settings accordingly. The maximum flash range is calculated
from the flash parameters and the guide number and indicated on the display.
This requires an exchange of data between camera and flash unit, effected for
example by tapping the shutter release.
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The maximum flash range is indicated on
the display panel of the flash unit. The
value indicated relates to subjects with a
reflection factor of 25%, which applies to

15.2 Manual adjustment of the flash range indication

If the camera does not send the parameterrs, the zoom position, ISO film speed
and f-stop parameters must be adjusted manually on the flash unit if the flash
range indication is to be reliable (see Chapter 6).

16 FE flash exposure storage

Some Canon cameras offer the possibility of FE flash exposure storage (FE =
flash exposure). This mode is supported in E-TTL flash mode.
FE flash exposure storage in E-TTL mode permits the amount of light required for
the subsequent shot to be determined and stored prior to exposure. This can be
expedient when flash exposure has to be adapted to specific details that may not
necessarily be identical with the main subject.
Set the flash unit to E-TTL flash mode (see 5.2). Focus the camera's AF sensor mete-
ring area on the zone whose flash exposure is to be predetermined. When the FE
button on the camera is actuated the flash unit will fire an FE test flash (the desi-
gnation FE may vary with individual camera models - please refer to the operating
instructions for the given camera). The electronic measuring circuit inside the
camera assesses the light reflected from the FE test flash to determine the light out-
put required for the subsequent exposure. The main subject can thereafter be focu-
sed with the AF sensor metering area of the camera. When the shutter release is
pressed the picture will be exposed with the previously determined light output.
☞ Due to system-inherent reasons any changes in the light situation after the FE
test flash has been fired will not be taken into account when the picture is shot.
Some cameras do not support FE flash exposure storage in the "green" full
auto mode and programmed image control modes (see camera's operating
instructions).