The PANOLUX EXPOSURE MODULE, affixed to the top of the camera via a " hot Shoe " type of mount, automates and varies exposures in three different modes of operation. 

All Auto Exposure measurements are made with the camera set to the " A " position located on the Shutter Speed Selector Dial.

Prior to any exposure or measurement, ISO and desired Aperture must be programmed into the Panolux Exposure Module. 

MODE 1. STANDARD EXPOSURE MODE:
In this mode of operation,  the PANOLUX operates as a reflected exposure meter. Also, Mode # 1 makes the camera operate in Aperture Priority.  After the PANOLUX is attached and programmed, rotation of the lens/drum is automatically controlled, with the PANOLUX choosing the correct drum rotational speed. Speeds are stepless, and therefore the camera is not locked into only the shutter speeds shown on the shutter speed selector dial.

MODE 2. VARIED EXPOSURE MODE:
In the Varied Exposure Mode, the PANOLUX operates as an incident meter. A single reading is taken and locked into the memory of the exposure module. When the shutter release button is depressed, and the lens/drum begins it's rotation, the memorized light measurement will cause the rotation of the drum mechanism to either slow down, in the case of a " cool " or darker area of the subject to be photographed, or speed up, in the case of a " hot " or brighter area of the subject to be photographed. This slowing down/speeding up of the lens/drum helps greatly to even out the overall exposure. Of course, there are no " seams " visible when this exposure compensation takes place. Exposure graduations from the darkest area to the lightest area will be a total of 3/4 of a stop. ( Best utilized with chrome film because of the narrow latitude of the film. )

MODE 3. INVERSE MODE:
In the Inverse Mode, the PANOLUX operates again as an incident exposure meter. A single reading is taken and locked into  the memory of the Exposure Module. As in most verticals, taken with panoramic cameras, the sky portion of the photograph will tend to be more overexposed than the rest of the photograph. Also, the foreground portion of the photograph will tend to be darker, or undexposed. When utilizing the inverse  mode, of the PANOLUX, the rotation of the lens/drum is speeded up during the first 1/2 of the exposure and slowed down during the second 1/2 of the exposure, therefore evening out the entire exposure. As in the Varied Exposure Mode, the total exposure compensation equals 3/4 of a stop.

The PANOLUX is available for Models 135 U, 150 E2 150 FE, 150 UX & 175 UX.

TECHNICAL DATA:

Silicone Photo Diode Incident Meter                               Two ( 2 ) Silicone Photo Diodes
Angle of Measurement/Reflected Mode                           33 Degrees
Angle of Measurement/Incident Mode                             150 Degrees
Measurement Axis                                                           15 Degrees angled towards foreground
Film Speed Range                                                            ISO 25 to 3200
Shutter Speed Range                                                        1/500 sec. to 1 sec.
Aperture Range                                                                 f. 4.0 to f.16 in 1/2 stop increments
Power Supply                                                                   2 x 1.5 V  ( LR 1 )