Technical data

116
Strobe flash mode
If the attached flash unit has the corresponding
function and an SCA-3501/3502 adapter is being
used, the LEICA M7 allows movements to be cap-
tured in single stages using stroboscopic flashes
on one image. Using this technique, several
flashes are emitted one after another with the
shutter open, which "freezes” the subject, which
should preferably be only weakly lit, in motion.
The camera automatically calculates the required
shutter speed, which is the product of the number
of single flashes selected on the flash unit and the
flash frequency selected.
With the aperture priority mode, this shutter
speed is used independently of the prevailing
lighting conditions. The fastest possible shutter
speed is once again 1/50s.
If the selected aperture means that there is a risk
of overexposure, the shutter speed display
flashes as a warning. On the other hand, there is
no warning if you are below the metering range.
If the exposure is set manually, the shutter speed
set is used. The camera/flash unit combination
responds differently depending on whether this
speed is faster or slower than the calculated,
required speed:
If the set shutter speed is faster than required, i.e.
the desired stroboscope exposure cannot be car-
ried out, the flash is not triggered and the flash
symbol does not appear. The light balance contin-
ues to work as normal.
If the set shutter speed is sufficient for or slower
than that required for the desired strobe exposure,
the flash is triggered and the flash symbol
appears. The light balance continues to work as
normal.
For "B”, the flash is also triggered, but only the
flash LED lights up before exposure. After expo-
sure, the flash LED goes out and the digital display
counts the expired seconds.
Flash LED displays in strobe mode
•  appears even though the flash unit is turned
on and ready to use:
The shutter speed set on the camera is too fast
for the number of flashes set on the flash unit.
•  flashes slowly (at 2 Hz) before the shutter is
released:
The flash unit is not operational yet.
•  lights up continuously before the exposure:
The flash unit is operational.