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I received a call today from someone who wanted to know if he could purchase a slide projector that can project at a throw of 420' onto an outdoor screen of 42'x 82'. For reference, their 35 mm projector uses 7K xenon lamphouse. Any thoughts?

There are some xenon slide projectors on the market.

I know there used to be a few companies that sold xenon slide projectors but the only one I know of that still produces them is Navitar. They retrofit a Kodak Ektagraphic III AMT slide projector with a Xenon lamphouse. Telex had short-arc slide projectors but has ceased selling slide projectors all together. Does anyone know of any other manufactures?

Elmo makes a Xenon slide projector and I believe Strong has one as well
For really large images they might want to think about 3x4 glass slides and a pani styled projector as it will withstand far more heat

Projecting a bright 42 x 82 foot still image on a low gain outdoor screen will be difficult. Even if you can get a larger lamphouse behind that projector, the amount of energy required will likely "toast" a 35mm slide. 35mm movies can use lamps as large as 7000 watts because the film is moving at 24fps, and not stationary in the gate. A larger format (e.g., old lantern slides) may work, since it spreads the energy over a much larger area.

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John P. Pytlak, Senior Technical Specialist
Worldwide Technical Services
Entertainment Imaging
Research Labs, Building 69, Room 7525A
Eastman Kodak Company
Rochester, NY 14650-1922
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Website: http://www.kodak.com/go/motion