P3D Contax beam-splitter

[Jacques Cornet <Jacques.cornet@xxxxxxxxx>]

I used a Contax beam-splitter on a Contaflex II (a kind of single lens reflex developed by Zeiss to use his recently acquired Compur shutters company. 
So the lens ( a 2.8 tessar) had a between the lenses compur shutter (no problem of vertical or lateral travel) but the focal  length could only be modified by changing the front element. One of these front elements incorporated a front lens for the tessar and two prisms (not just mirrors, as I remember. It also had the equivalent of the Loreo-Argus "nose" in center.
The complete stereo equipment included a projection beam splitter equivalent consisting of two prisms and polarizing filters for the 300 watts Zeiss projector. That system, the Sterikon 10 comes in the form of a round filter, only 6 cm in diameter. The divergence of the projected images is so given by the prisms, and varies with the distance of the screen.... 
So the whole discussion of convergence, infinity and all seems to have been discounted by Zeiss..., counting on the "brain accommodation of viewers". I must add that another, more expensive, projection system included a "real" beam splitter followed by two separate projection lenses on 500 watts projector.

Zeiss Sterikon system might have inspired Mr Matagne "Spatial", a false stereo system using the same kind of prisms (smaller angle) on the projector to project two images from the same 24x36 dia, at a "certain" distance from each other, so you see a left and a right image, and a black border on the screen gives the "window".

thanks for your attention.  
Jacques Cornet
Eikenlaan, 22
B 1640 Sint Genesius Rode
Belgium
Tel./Fax : (32)(2)358.26.96