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13. Correct exposure indication
The correct exposure indication „OK“
only lights up if the shot was correctly
exposed in TTL /E-TTL flash mode or automatic flash mode.
If no „OK“ exposure indication
appears after the shot, then the shot was
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).
14. Displays in the camera viewfinder
Flashing flash symbol
:
Use or switch on the flash unit (on some cameras)!
Illuminated flash symbol
:
The flash unit is ready for use (on some cameras).
Some cameras feature a faulty-exposure warning function in the viewfinder:
Accordingly, the stop value, the shutter speed or both displays, will flash in the
viewfinder to indicate over- or underexposure.
Fundamentals in connection with faulty exposures:
• With overexposure: Do not flash!
• With underexposure: Switch on the flash unit or use a tripod and set a slower
shutter speed.
There can be various reasons for faulty exposures in the different exposure and
automatic programs.
Refer to the operating instructions to establish whatever is applicable to
the displays in the viewfinder for the given camera model.
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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-, 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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