Leica SF 26 Manuel page 57

Setting the function
Press the TTL button
The LED in the TTL button illuminates
yellow.
Photographing
Tap the shutter release
(Makes the data exchange possible between
the flash unit and camera, which is required
for TTL flash mode.)
Check flash readiness, i.e. whether the
STATUS LED is green
Take a photograph
If the shot is exposed correctly, the
STATUS LED illuminates red for ca. 3
seconds.
Please note:
Please note whether there are limitations for
your camera in terms of film sensitivity for TTL
flash mode (for example, ISO 64 to ISO 1000;
see camera's manual)!
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