Galvanometer
Qη
the body
Galvanometer ./
needle visible\\
\in the viewer
dots
，
press lens lightlγto the camera
bodγand turn it clockwise until it clicks
In.
2) ALPA lenses
ALPA has chosen an incomparable
selection of lenses produced bγthe most
well-known manufacturers: Kern
，
Kinoptik
，
Angenieux
，
Schneider
，
Zoomar and Zeiss.
Each lens undergoes a rigorous control of
an extremely high standard. The lenses
have a range of focal lengths between
24 and 600 mm and their baγonet
mounting sγstem has remained unchanged
since 1952. Among this fine selection of
lenses are three exclusive to ALPA- the
well-known Kern Macro-Switar 1.9/50
rnm (the standard lens of the ALPA) and
the Kinoptik apochromats.
F. EXPOSURE READINGS
1) Basic Principles
Fig. 13 illustrates the ingenious
，
elec-
tronic behind-the-Iens CdS meter sγs-
tern which couples opticallγ-with anγ
Potentiometer
Photoresistor
compensates light
enteflng
the eyepiece
Fig.
13
of the more than 20 lenses
，
accessorγ
，
at anγdistance
，
extreme film speed range from
AS
A.
All f/stops
，
shutter speeds and ASA
ratings are directlγcross-coupled to the
highly sensitive galvanometer for ins-
tant exposure settings
，
automatically-
or manuallγ. Two CdS cells take accu-
rate overall light readings with predo-
minance on the center area
，
while the
third CdS cell electronically compen-
sates for light entering the eγepiece
，
for absolutelγprecise exposures. The
well illuminated needle is always clearly
visible
，
either at eγelevel in a separate
window below the viewing screen
，
or at
waistlevel in a second window in the
accessory clip on the camera top. The
camera release button automatically
activates the 2 standard Mallory mercury
batteries (PX 450)
，
extending batterγ
life to 2γears or more. Goldplated
contacts guarantee accurate function-
ing of the meter sγstem
，
even while
battery voltage decreases.
Important: Alwaγscheck ASA rating
，
when changing your film (see page 2)
anγlens
for an
3-6400
9
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