Automatic High-Speed Synchronisation (Hss); Manual Flash Exposure Correction - Metz 50 AF-1 digital Manual De Instrucciones

7.3 Automatic high-speed synchronisation (HSS)

Various cameras support automatic high-speed synchronisation (see the
camera's operating instructions). This flash mode makes it possible to use a flash
unit even with shutter speeds that are faster than the flash sync speed.
Interesting results may by achieved in this mode when, for example, a wide
open aperture (e.g., f/2.0) is used to limit the depth of field in portrait shots
taken in very bright ambient light. The flash unit supports high-speed synchroni-
sation in E-TTL and M flash modes.
For physical reasons, however, high-speed synchronisation significantly reduces
the number and the maximum flash range. Be sure to note, therefore, the flash
range on the display of the flash unit. High-speed synchronisation is activated
automatically if a shutter speed faster than the flash sync speed is set on the
camera, whether manually or automatically by the exposure program.
Note that in the case of high speed synchronisation the guide number of
the flash unit also depends on the shutter speed. The faster the shutter
speed, the lower the guide number!
Setting procedure
TTL
E
TTL
E
HSS
HSS
F 5,6
7,5 105
m mm
Zoom
High-speed synchronisation can be deleted by repeatedly pressing the „Mode"
button until the „HSS" symbol disappears.
Second curtain synchronisation (REAR) is automatically deactivated when
the flash unit is set to high-speed synchronisation HSS!
90
• repeatedly press the„Mode" button
TTL M
until „E HSS" or „ HSS" flashes
in the display.
The setting takes effect immediately.
After about 5 seconds the display stops
flashing and the setting is saved auto-
TTL M
matically. „E HSS" or „ HSS" is
shown in the display.

8 Manual flash exposure correction

The auto flash exposure mode of most cameras is adjusted to a reflection factor
of 25% (the average reflection factor of flash subjects). A dark background that
absorbs much of the light or a highly reflective bright background (backlit shots,
for example) may result in, respectively, underexposure or overexposure of the
subject.
To offset these effects, the flash exposure can be adjusted manually for the shot
with a correction value. The extent of the correction depends on the contrast bet-
ween the subject and background!
In TTL flash modes, manual flash exposure correction factors of from -3 EV
(f-stops) to +3 EV (f-stops) can be adjusted on the flash unit in one-third incre-
ments.
Tip:
Dark subject against light background: positive correction factor.
Light subject against dark background: negative correction factor.
Exposure correction by means of alteration of the lens aperture setting is
impossible, since the camera's automatic exposure program regards the
altered aperture setting as the normal working aperture setting.
When setting the correction factor, the distance shown in the display can
change and be adjusted to the correction factor (depending on the
camera model)!
Setting procedure
• Press button — or + until „EV" flashes.
Set a negative correction factor with the
button — or a positive one with the button +.
The setting takes effect immediately.
After about 5 seconds the display stops flashing and the
setting is saved automatically. After saving, „EV" appears in the display with the
correction value set in place of the aperture factor.
E TTL
EV
0,7
0,7
EV
6,8 35
m mm
Zoom