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3. The flash unit must be set to A or M. For M, the reduced
power output must be determined by guide number calcu-
lation and set manually on the flash unit. For A, the aperture
settings on the camera and the flash unit must be the same.
• For indirect flash (rotated or tilted flash reflector), the flash
unit must be set to A mode.
• Do not use a cover for the flash (hot) shoe, as this will mechan-
ically shut down the internal flash.
The information below relates to the use of the built-in flash unit.
The camera primarily controls flash exposures by controlling the
light emission based on the automatically or manually set aper-
ture and the automatically or manually set distance.
For manual flash activation (modes No. 6–10) and backlight
situations, i.e. inadequate external brightness, the automatic fill-
in flash control on the LEICA CM guarantees a balanced rela-
tionship between ambient and flash illumination by appropriately
adjusted dosing of flash power output.
Important: When using the flash in any mode, check that the
main subject is within the appropriate flash range.
Flash range
The effective range of the flash depends on the set aperture and
the film speed. For good results, it is crucial that the main sub-
ject is within the appropriate flash range. See the table below for
details.
Notes:
• The distances given in the table are based on the use of posi-
tive slide film. When using negative films (for prints), where a
slight “underexposure” due to their wide exposure latitude is
not so critical, the range can be extended by a factor of 1.4.
• Deeply staggered subjects cannot be uniformly illuminated by
the flash light from the front to the back. The information re-
lates to the parts of the subject recorded in the metering field
and are therefore only a guideline.
• All values are rounded off.
Film speed Maximum effective
in ISO flash range
25/15° 0.7– 2.9m
50/18° 0.7–
4.1
m
100/21° 0.7– 5.8m
200/24° 0.7– 8.2m
400/27° 0.7–
11
.6m
800/30° 0.7–16.5m
1600/33° 0.7–23.3m
3200/36° 0.7–33.0m
5000/38° 0.7–41.2m
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