Stereoscopic cameras taking two pictures to make 3D photos were successful in the beginning of XXth century.
So, from 1905, Voigtlander made several stereoscopic cameras, first adapting existing cameras -like the Alpine stereoscopic-
then manufacturing special stereoscopic cameras for 3D pictures.
Two models are well known : the Stereofotoskop with a simple reflex finder and the Stereoflektoskop with a real reflex finder.
The Stereofotoskop uses only 4.5×10.7 plates, but the Stereophotoskop uses 4.5×10.7 or 6×13 plates according to the model.

Stereflektoskop 4.5×10.7 (1923-1928)

Stereflektoskop 6×13 (1936-1938)

 

 

Stereflektoskop 4.5×10.7 (1923-1928)

N°687XX（1925） – 格式板4,5×10,7。
Compur Stereo快门1/250。 3个Heliar 4.5 / 65mm镜头。
带反射探测器的立体摄像机。
升起和降落。
通过围绕中心镜头旋转环来调节隔膜。
光学折叠取景器在一边。
12块板。 通过推拉改变板。
N°687XX (1925) – Format plates 4,5×10,7.
Compur Stereo shutter 1/250. 3 Heliar 4.5/65mm lenses.
Stereoscopic camera with reflex finder.
Rise and fall.
Diaphragm adjusted by rotating a ring around the central lens.
Optic folding finder on side.
12 plates. Changing plates by push-pull.
Top of the finder hood.

Stereflektoskop 6×13 (1936-1938)

N°110XXX（1936） – 格式板6×13。
Compur Stereo快门1/250。 3个Heliar 4.5 / 75mm镜头。
带反射探测器的立体摄像机。
升起和降落。
通过旋转与速度滚花相反的滚花来调节隔膜。
折叠式运动发现器。 相机正面有大型保护盖。
12块板。 通过推拉改变板。N°110XXX (1936) – Format plates 6×13.
Compur Stereo shutter 1/250. 3 Heliar 4.5/75mm lenses.
Stereoscopic camera with reflex finder.
Rise and fall.
Diaphragm adjusted by rotating a knurl opposite to the speed knurl.
Folding sports finder. Large protective flap on the front of the camera.
12 plates. Changing plates by push-pull.
Sports finder open.

Protective flap closed.

Camera with its own case.
Compartment for filters under the lid.