5.4.6 Guide number indication when using
lenses without CPU (Fig. 31)
Lenses without CPU (i.e. without electronic data
transmission) do not transmit to the camera any
electric information about focal length and aper-
ture setting. If such a lens is used on a Group A
camera, then the mecablitz will only receive from
the camera the data relating to the film speed in
ISO. The position of the zoom reflector must be set
manually (see 5.7.2). In this case the LC-display
of the mecablitz indicates the guide number for
the current setting instead of the distance (in the
given example: guide number 34). The maximum
flash range is the result of the following formula:
guide number
Maximum flash range = -------------------
aperture
Refer to the instructions regarding the flash-
to-subject distance in section 5.5. The guide
number is not indicated when the reflector is
folded down.
5.4.7 Meter-Feet changeover (m - ft)
The maximum flash range indicated by the meca-
blitz LC display can be either in meter (m) or feet
(ft). To change between the two, proceed in the
following manner:
• Turn off the mecablitz by its main switch.
• Keep the “Select” key combination depressed
(= “Mode” key + “Zoom” key).
• Turn on the mecablitz by its main switch.
• Release the “Select” key combination (= “Mode”
key + “Zoom” key).
• The flash range indication changes from m to ft
or from ft to m.
5.5 Determining the maximum flash range
with the guide number table
Group B cameras do not transmit to the flash unit
the ISO, aperture and focal length data. Conse-
quently, the mecablitz LC display will not indicate
the camera’s aperture and the maximum flash
range. In such an event you can determine the
maximum flash range with the help of the tables
listed in the Addendum.
Use the following formula:
guide number
Maximum flash range = -------------------
aperture
☞
mecablitz and camera functions
Funzioni del mecablitz e della camera
mecablitz y funciones de la cámara
50
Fig. 31 / Grabado 31
TTL
M. Zoom
mm
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