| The new PANOLUX
The PANOLUX is an exposure metering and control module which you can
purchase in addition to your NOBLEX. The PANOLUX automatically controls
the exposure time of your camera. There are two measuring methods for
this: reflective metering (light metering in direction of the subject),
and metering of incident light. The incident light metering offers two
different methods of measuring: pure metering of incident light
(metering of the light falling on the subject and/or the white diffuser
independent of the reflection qualities of the subject) and
subject-oriented metering of incident light (simultaneous reading with
the detector cell and the diffuser which means that the
reflections of the subject are taken into consideration). When working
in reflective metering or subject-oriented metering of incident light it
is also possible to enter correction factors into the PANOLUX which
influence the drum rotation speed during the exposure process. According
to the correction factor set on the PANOLUX, the lens drum moves slower
or faster in the corresponding parts of the exposure and different
exposure times are produced during one drum rotation. Typically, a
slower rotation will ‚brighten‘ that area. Conversely, a faster rotation
will ‚darken‘ that portion of the photograph. There are 4 measuring
methods available:
- Reflective Metering
Reflective reading is carried out by the front detector cell (808).
The PANOLUX measures the light reflected from your subject. To avoid
an overweighting of the bright sky portion, the measuring axis of the
front detector cell (808) is anlged down by approx. 15°. When normally
holding the camera, an area approx. 18 feet in front of the camera is
measured. The measuring anlge is approx. 33°.
- Reflective Metering with Exposure Correction
It is possible to influence the exposure time measured by
reflective metering by entering correction factors. This results in a
dynamic change of the shutter speed rotation during the exposure. That
means when using correction factors the lens drum moves slower or
faster in the corresponding parts of the exposure and different
exposure times are produced during one drum rotation.
- Metering of Incident Light
When working with the pure metering of incident light the light
falling on your subject (respectively on the white diffuser (807)) is
measured. The measurement does not take into account any reflected
light. The incident light is measured by two light sensors oriented to
the back right and to the back left under the white diffuser (807).
When measuring the incident light the average value between both light
sensors is determined. This average exposure time is basis for the
complete exposure.
- Subject-oriented Metering of Incident Light
When working with the subject-oriented metering of incident light
all three light sensors (807 and 808) are active. This kind of
metering results in an automatic exposure compensation by different
drum speeds during the exposure process. The compansation is
intensified when entering positive correction factors or can be
reversed when entering negative correction factors (verticals). Here
an example: Sunlight falls from the back over your right shoulder on
the subject. Consequently, the left part of your subject is brighter
(too bright) and the right part of the subject is darker (too dark).
The different measurements of the two light sensors under the white
diffuser (807) result in a faster rotation of the lens drum in the
left part of your subject and in a slower rotation of the lens drum in
the right part of your subject. An exposure compansation takes place
during the lens rotation. The exposure time for the middle part of the
subject is measured by the front detector cell (808).
- Verticals
When taking verticals with automatic contrast compansation, it is
always necessary to set a negative correction factor. Here is the
explanation: Camera and PANOLUX are in a vertical position. The light
sensor which points to the sky measures a brighter value, the light
sensor which points to the ground measures a darker value. According
to the logic used for the exposure compansation the PANOLUX
electronics would interpret the brighter part of the subject at ground
level. The contrast between sky and ground would be infensified.
However, when using negative correction factors this effect is
reversed. The PANOLUX has an effect of a graduated filter. The sky
becomes darker and the ground brighter.
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