Leitz 4x5" projectors?

[Willem-Jan Markerink <w.j.markerink@xxxxx>]

Dear group, in particular the old farts among us, and those with a 
Teutonic-gear affection:

Does any of you have experience with, or knowledge of a Leitz 4x5" 
projector? I stumbled upon such a dinosaur, with 500mm 
lens....apparently used for commercial breaks in cinema's....yet all 
I hear when digging for info is that these things are supposed to be 
6x7, not 4x5"?

Anyone able to tell me a bit more about these things, and perhaps 
such cinematographic projectors in general? Perhaps even an average 
price on the used market?

--                 
Bye,

Willem-Jan Markerink


      The desire to understand 
is sometimes far less intelligent than
     the inability to understand


<w.j.markerink@xxxxx>
[note: 'a-one' & 'en-el'!]