[Leica] Leitz Large Lecture Hall Epidiascope IIIs

[fredhess at phenix-visuals.nl (Fred Hess / Phenix Visuals NL)]

Hello Willem-Jan,

Try to contact mr. Rolf Beck, documentalist at Leica Microsystems in
Wetzlar. He will surtainly be able to date this Grossraumprojektor. And
provide you some more information about this beast!

Regards /groeten,

Fred Hess


----- Original Message -----
From: "Willem-Jan Markerink" <w.j.markerink@a1.nl>
To: <leica-users@mejac.palo-alto.ca.us>
Sent: Saturday, December 07, 2002 10:22 PM
Subject: [Leica] Leitz Large Lecture Hall Epidiascope IIIs (was: Time-line:
focal length in centimeters versus mi


> Forgive me for this repeated posting, just want to be sure that I
> don't miss any audience due to the previously cryptic/non-descriptive
> header:
>
> ------- Forwarded message follows -------
> From:           "Willem-Jan Markerink" <w.j.markerink@a1.nl>
> To:             leica-users@mejac.palo-alto.ca.us
> Date sent:      Thu, 28 Nov 2002 23:13:30 +0100
> Subject:        [Leica] Time-line: focal length in centimeters
> versus millimeters on projection lenses, Epidiaskop IIIs
> Send reply to:  leica-users@mejac.palo-alto.ca.us
>
> Dear group,
>
> Last week I became the proud owner of what must be one of the most
> unique pieces of Leitz projection equipment, the Large Lecture Hall
> Epidiascope IIIs[*]....a monstrous steel contraption, 211cm tall,
> 64cm
> wide, 94cm long, 300-500kg. Needed a full-size horsetrailer with
> loading-ramp to haul it home, 5 men for pushing it in the trailer, 3
> men for controlled unloading....8-))
>
> Here a preliminary image, lenses removed:
>
> http://www.a1.nl/phomepag/markerink/epimonst.jpg
>
> However, even though I bought it from the university where it had
> been
> in active duty many many moons ago, it had been so long out of duty,
> pushed aside in a projection room, only recently being forced to move
> due to demolishing of the lecture hall itself, that no body knew its
> year of build or purchase....it even preceeded the career of the
> current janitor ("It's old Jim, but not as we know it...."....8-))
>
> My only time-line reference is the fact that I already had an
> episcopic lens from another IIIs, with different focal length
> annotation; 1:3.5/700mm instead of f=100cm/1:3.5 (both 'EPIS', and
> yes, that's 20cm & 30cm lens diameter....the big one is too heavy to
> lift to chest-height(!)). Can anyone tell me whether this helps
> putting a date stamp on it, at least accurate to a margin of a
> decade?
>
> Serial number of the projector itself is A87052, but I doubt that
> helps anything, unless a few known samples around this number exist.
>
> Oh, diascopic projection (up to 4x5", wooden slide-adapters of
> 14x14cm) is 110v/1500W (E40 lamp), episcopic projection is 4x 1500W
> (with lens/condensor between lamp and paper, each lamp one lens,
> never
> seen that in smaller episcopes; probably a must in large lecture
> halls
> because of the highly inefficient nature of the episcopic projection
> (reflective)). Episcope lenses are 50cm/1:5.7 and 60cm/1:4.5, in a
> dual/revolver set-up (for slightly different formats of
> slides)....same lenses are used on smaller Diaskop and Epidiaskop.
>
> [*] have yet to find the official German name, did speak to Leitz
> folks on the PhotoKina, who agreed with my 'Grossraum Epidiaskop
> IIIs'
> translation....further cooperative research is pending, as hardly
> anyone working at Leitz today knows much about any
> (Epi)Diaskop....either they are able to trace down one or more
> senior/retired employees, or I might get an invitation to do research
> in the Leitz archives itself....ah, the honor!....:))
>
> See also....
>
> http://www.a1.nl/phomepag/markerink/epimonst.htm
>
> ....for the only picture from a IIIs I have found in Leitz literature
> thusfar (this one has a 130cm episcope lens, 70cm diascope lens, but
> with 'internal' focus, unlike the 'open' screw-collar of both my
> 700mm
> and 100cm episcope lens (and both diascope lenses as well....only on
> an older & smaller Epidiaskop I have such sliding/internal focussing
> lenses)
>
> Only one time before have I seen such a IIIs projector being traded,
> in the UK (within some kind of association of historical photography,
> tried to track down more info back then, but failed due to their
> shielded membership structure (internal auction)).
>
> More about the last range of 'smaller' Diaskop and Epidiaskop (until
> late 60's) on:
>
> http://www.a1.nl/phomepag/markerink/diaskop.htm
> http://www.a1.nl/phomepag/markerink/epidiask.htm
>
> Bottom line:
> If *anyone* knows more about *any* of these projectors, in particular
> this huge IIIs, please step forward, in the name of optical/academic
> history....;))
>
> --
> Bye,
>
> Willem-Jan Markerink
>
>       The desire to understand
> is sometimes far less intelligent than
>      the inability to understand
>
> <w.j.markerink@a1.nl>
> [note: 'a-one' & 'en-el'!]
>
>
> --
> To unsubscribe, see
> http://mejac.palo-alto.ca.us/leica-users/unsub.html
> ------- End of forwarded message -------
> --
> Bye,
>
> Willem-Jan Markerink
>
>       The desire to understand
> is sometimes far less intelligent than
>      the inability to understand
>
> <w.j.markerink@a1.nl>
> [note: 'a-one' & 'en-el'!]
>
>
> --
> To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html
>