I've had a look around some of the internet sources and it seems there were a reasonable number of installations which used the Optiverter system. They are associated with new-build cinemas from around 1970. One particular twin cinema used conventional dual projection in their large auditorium and an Optiverter in the smaller one.
Here are a couple of pictures of an original Trans-Lux RP lens - offered for sale on that auction site some years ago. (No idea what the collar was meant to do). Some original Trans-Lux documentation stated that the typical throw ratio was about 1:1. Another of their patents shows a lens mount with adjustable sideways shift so that both images could be exactly superimposed, and the keystone eliminated.
Trans-Lux RP Lens 01.jpg Trans-Lux RP Lens 02.jpg
And here is one of the rear projection system of the former Times Newsreel Theatre, here in Melbourne, Australia.
Times Newsreel - Melbourne.jpg
The cinema was in a basement, and the projection room was another level below, with a steep upwards rake. This shot was taken well after closure and the dust is a consequence of the redevelopment works in the building above. Some documentation on site showed that they originally had a genuine Trans-Lux screen.
Here are a couple of pictures of an original Trans-Lux RP lens - offered for sale on that auction site some years ago. (No idea what the collar was meant to do). Some original Trans-Lux documentation stated that the typical throw ratio was about 1:1. Another of their patents shows a lens mount with adjustable sideways shift so that both images could be exactly superimposed, and the keystone eliminated.
Trans-Lux RP Lens 01.jpg Trans-Lux RP Lens 02.jpg
And here is one of the rear projection system of the former Times Newsreel Theatre, here in Melbourne, Australia.
Times Newsreel - Melbourne.jpg
The cinema was in a basement, and the projection room was another level below, with a steep upwards rake. This shot was taken well after closure and the dust is a consequence of the redevelopment works in the building above. Some documentation on site showed that they originally had a genuine Trans-Lux screen.
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