Automatic Flash Sync Speed Control; Correct Exposure Indication; Flash Range Indication - Metz MECABLITZ 58 AF-1 digital Mode D'emploi

13. Automatic flash sync speed control

Depending on the camera model and camera mode, the shutter speed is swit-
ched to flash sync speed when flash readiness is reached (see the camera's ope-
rating instructions).
Shutter speeds cannot be set faster than the flash sync speed, or they are swit-
ched automatically to the flash sync speed. Various cameras have a sync speed
range, for example from 1/30 sec. to 1/125 sec (see the camera's operating
instructions). The sync speed set by the camera depends on the camera mode,
the ambient light, and the focal length of the lens used.
Shutter speeds slower than the flash sync speed can be set according to the
camera mode and the selected flash synchronisation (see also the camera's ope-
rating instructions and 16).
When using a camera with a between-the-lens shutter (see the camera's
operating instructions) or P-TTL-HSS high-speed flash mode (see 16.4),
flash sync speed is not controlled automatically. As a result, the flash can
be used at all shutter speeds. If you need the full light output of the flash
unit, you should not select a shutter speed that is faster than 1/125
second.

14. Correct exposure indication

The correct exposure indication „OK"
exposed in TTL flash mode or automatic flash mode.
If no „OK" exposure indication
underexposed. You will need to repeat the shot with the next smaller f-number
(for example, f/8 instead of f/11), or the distance to the subject or reflecting sur-
face (for example with bounce flash) will have to be reduced. Note the maximum
flash range indicated on the display of the flash unit (see 15).
110
only lights up if the shot was correctly
appears after the shot, then the shot was

15. Flash range indication

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 most photographic situations. Strong deviations from this reflection factor, as
in the case of highly reflective or poorly reflective subjects, may affect the flash
range.
In 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 7.7). There is no flash range indication in remote
mode or when the main reflector is swivelled or tilted.
Automatic adjustment of the flash range indication
The cameras transfer the flash parameters (e.g. lighting sensitivity ISO, lens focal
length, aperture and exposure correction) to the flash unit. The flash unit automa-
tically 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.