Yes, the bulb (at best a halogen) is in the vicinity of a tungsten lamp
color temperature. However, our brains do a marvelous job of color
balancing the images the eyes send it. Why doesn't it do this with
prints? Because of how they are viewed out of context. Our brains are
correcting whatever the lighting is for the surroundings, not the print
which is but a relatively small object in the surroundings. In projection,
the projector lamp is the primary light source and the image is large (more
immersive).
The best type of projection screen for image detail is white matte. The
tradeoff is it's not quite as reflective as other surfaces, nor can a
viewer be quite as off center and still view it that well. Glass bead are
extremely high in reflectivity but comparatively poor for detail level.
The best inexpensive lens I've found for Kodak's carousel type projectors
is the Schneider-Krueznach Prolux f/2.8 zoom lens. Bright and very sharp
with no coma or other visible aberrations. It is a flat field lens, so you
must let glassless slides "pop" in their mounts.
-- John
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