The upper red band (40) also shows you the maximum aperture of the lens in use; in the illustration on the
opposite page, an f/1.7 lens is on the camera, so the band rests between f/1.4 and f/2. When you mount a faster
or slower lens on the camera, this band will more up or down to show the new maximum aperture (and,
simultaneously, the new underexposure zone.)
"Your Konica's sensitive through-the-lens meter automatically determines correct exposure over an
exceptionally wide range of lighting conditions...with ASA100 film, from a subject so dimly-lit it requires an
exposure of 1/2 second at f/1.7 to a scene
almost 50,000 times brighter - so
bright it requires an exposure of
l/l000th second at f/16! Within this basic "range" of meter sensitivity, the red band (40) in the viewfinder
remains at a position corresponding to the maximum aperture of your lens (f/1.7 in the illustration).
Under certain conditions, the red band (40) will drop
below
the maximum-aperture position. For example, with
an f/1.7 lens and ASA 100 film, selecting a shutter speed of one second will cause the red band to drop down to
a position between f/2 and f/2.8. Here, your camera is preventing imcorrect exposure by actually showing you
that, with this film/lens/shutter-speed combination, f/2.4 is the widest lens opening at which your camera will
automatically operate. As always, your photograph will be perfectly exposed, so long as the Meter Indicator
Needle (41) does not go into the red-band. Thus, with your Konica Autoreflex-A3 you need never worry about
whether or not you're operating within your meter's "coupling range" - You
are, and will obtain a perfectly-
exposed photograph automatically, so
long as the meter needle is out of the red!
4.b utkus .org
Konica's Control-Center viewfinder also shows you:
1) Underexposure Indicator for f/1.2 Lens (38);
2) Complete Aperture Scale (42); and
3) Match-Needle Index Mark for stop-down metering with uncoupled lenses or accessories (39).
USING AUTOMATIC EXPOSURE CONTROL (AEC)
