Leica M Instruction Manual page 195

Note:
If the automatically controlled or manually set shutter speed is faster
than / s, the flash is not fired unless the flash unit is HSS
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180
compatible (see p. 194).
Flash exposure displays in the viewfinder with system-
compatible flash units
A flash-shaped LED (2.1.3) appears in the camera viewfinder as
confirmation and to display the various operating conditions. This LED
appears together with the displays for exposure metering for the
ambient light level, described in the relevant sections.
In automatic flash mode
(flash unit set to Guide Number Control)
• does not appear although the flash unit is turned on and ready to
use:
A faster shutter speed than
and the connected flash unit is not HSS compatible. In such cases,
the Leica M will not fire the flash unit even though it is turned on
and ready to use.
• flashes slowly (2Hz) before taking the picture:
The flash unit is not yet ready to use.
• lights up before taking the picture:
The flash unit is ready to use
/ s is set manually on the camera
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• remains continuously lit after firing but the rest of the displays
have disappeared:
Flash exposure was OK, the flash is still ready to use.
• flashes quickly (4Hz) after firing but the rest of the displays have
disappeared:
Flash exposure was OK, but the flash is not yet ready to use again.
• disappears along with the rest of the displays after firing:
Underexposure, e.g. due to the selected aperture being too small
for the subject. If the flash unit is set to a partial discharge power,
because of the lower power requirement it may be ready for use
despite the flash LED not lighting up.
When the flash unit is set to camera control (A) or manual
mode (M)
• does not appear although the flash unit is turned on and ready to
use:
A faster shutter speed than
such cases, the Leica M will not fire the flash unit even though it is
turned on and ready to use.
• flashes slowly (2Hz) before taking the picture:
The flash unit is not yet ready to use.
• lights up before taking the picture:
The flash unit is ready to use
193
/ s is set manually on the camera. In
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180