Ergo. Years of release 1927-1931.

The frame format is 4.5x6. Plate detective camera in the form of a monocular.
Sighting and shooting is performed at an angle of 90 degrees to the monocular axis.
The front pseudo lens is the diaphragm setting knob (4.5 to 36).
The interliner central shutter with 1/25, 1/50, 1/75, 1/100, “B” and “Z” shutter speeds. Lens "Tessar" (4.5 / 35).
Focusing on the scale of distances, moving the lens using a mechanical drive. The minimum shooting distance is 2 meters.
Used for covert shooting of objects and subjects.

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