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Re: [OM] 4x5 projectors

Subject: Re: [OM] 4x5 projectors
From: Moose <olymoose@xxxxxxxxxxxxx>
Date: Tue, 28 Jan 2003 01:38:51 -0800
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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