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The Focusing Mechanism - The Lens
Arguably the most important part of the projector, the lens allows the
transition of light to projection medium. The quality of the lens you use is of
utmost importance as it will directly affect the image quality of your
projector. If you get a scavenged lens, be sure the lens is not scratched, and
inspect the lenses for any coatings. Many lenses are coated to improve the
optics of the lens. Products like Windex will severely damage these coatings
resulting in pilling, fogging, or even etching of the actually glass. FYI, most
CRT
monitors are subject to the same conditions. Don't ever clean your
CRT
with Windex or similar products. Of course you would know this if you read the
manual.
Pre Manufactured Lens
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$170 - $250
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scavanged lens from a slide projector modified
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$20 - $135
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Scavanged overhead projector lense head
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$20 - $70
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Using a overhead projector as light source
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$0
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The Display Medium - The Screen
In most cases you will need a reflective surface which may be either
treated with aluminum (for higher contrast in areas with ambient light) or a
white surface with small glass beads (for high brilliance under dark
conditions). Using a painted wall is usually not a good idea. Most paints are
gloss or Simi-gloss and reflect and diffuse the light and there for color away.
There are several ways to get your screen setup. From wall laminates to wall
mount dropdown screens, to portal tripod based screen.
Portible Tripod Unit 85"
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$65 - $100
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Manual Walmount 100"
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$110 - $180
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Automatic Walmount 100"
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$330 - $490
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Wall Laminate
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$20 - $190
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