I used to have one at work. Actually I conceived of, helped design and
had built about 20 of them. The projector was vertical with a 2 mirror
folded light path for rear projection on a 6x7 ft. screen. Light source
was an enclosed Xenon arc lamp. The fun part was the 3 magnifications.
There were 3 lenses on a rotating turret. The slide carrier mechanism
moved up and down for magnification change both for focus and to
maintain brightness at higher magnification using the old Besseler "Cone
of Light" principle. The slide carrier moved around with a joystick at
the higher mags.The original used Schneider Componon lenses, the rest
Rodenstock Omegarons. Everything was electronically controlled (TTL
logic before microprocessors) so the user only saw a control panel with
a slot to insert the slide, buttons for choosing magnification and the
joystick to move the image around. Of course, we had to have our own
custom overhead rail camera to take the slides and a small lab to
process the Kodak aerial photography film. Tricky stuff to process, but
I never saw any grain even at huge magnification. Amazing detail and
sharpness.
It was really a spectacular system, amazing images, but needed about an
8x12 ft. room dedicated to it, so all I have now is some pictures of
them and a few lenses.
Moose
Andrew Gullen wrote:
Well... you know you actually *can* (whether or not anyone does). There was
a 4x5 projector up on eBay within the last month or so. I thought about it
for a few seconds as it would be way cool and I'm considering 4x5, but
decided it wasn't worth the domestic trauma. Looked to be about the size of
a motorcycle.
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