[simpits-tech] Lenses for 'warping' projectors?

Thu, 11 Apr 2002 19:50:20 -0600

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Lenses for 'warping' projectors?I have the pit with the shower curtain
www.interfold.com/gcompc the white plastic shower curtain works great. I'm
using an Infocus LP225, 250 Lumen LCD projector which is old as heck, does
800x600. The newer projectors are much better. I have a DA-LITE mini rear
view screen also, expensive and not as good as the shower curtain.. The
problem with rear projection is you have to have a medium opaque enough to
allow maximum light, but not allow hot spotting. After experimenting with
the DA_LITE, window shades etc, the shower curtain was the perfect medium,
good reflectivity and no hot spotting. There is some light loss but it's not
that bad at all. Total for the screen I built was about $10.00. It's
brighter if forward projected but I didn't have the room from the other side
of the pit. I have looked but haven't found a super wide angle lens yet.
Hope this helps.
  -----Original Message-----
  From: simpits-tech-admin@simpits.org
[mailto:simpits-tech-admin@simpits.org]On Behalf Of Wiebe, Alex
  Sent: Friday, May 17, 2002 10:59 AM
  To: 'simpits-tech@simpits.org'
  Subject: [simpits-tech] Lenses for 'warping' projectors?

  In my random browsing of peoples pits, I spotted a unique solution for
rear projection - using a shower curtain. Whoever did that - how well does
it work? Given that a shower curtain is about $5 at Walmart and a
translucent projection screen is _way_ more - is it worth the savings?

  Regarding fresnel lenses: how good are they for off angle viewing? for say
side or corner views? Do they only really work if you're facing them
straight on?

  My main reason for posting: are there lenses that can be added to LCD /
overhead projectors that will stretch / compress the edges to fit a wrap
around screen? Ideally for the SpitFire I'd like to make a 6' wide x 3-4'
high screen that wraps around the front of the windshield. I'm thinking the
viewing angle from left to right would be about 130-140 degrees.

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<DIV>I have=20
the pit with the shower curtain <A=20
href=3D"http://www.interfold.com/gcompc">www.interfold.com/gcompc</A> =
the white=20
plastic shower curtain works great. I'm using an Infocus LP225, 250 =
Lumen LCD=20
projector which is old as heck, does 800x600. The newer projectors are =
much=20
better. I have a DA-LITE mini rear view screen also, expensive and not =
as good=20
as the shower curtain.. The problem with rear projection is you have to =
have a=20
medium&nbsp;opaque enough to allow maximum light, but not allow hot =
spotting.=20
After experimenting with the DA_LITE, window shades etc, the shower =
curtain was=20
the perfect medium, good reflectivity and no hot spotting. There is some =
light=20
loss but it's not that bad at all. Total for the screen I built was =
about=20
$10.00. It's brighter if forward projected but I didn't have&nbsp;the =
room from=20
the&nbsp;other side of the pit. I have looked but haven't found a super =
wide=20
angle lens yet. Hope this helps.</DIV>
<BLOCKQUOTE dir=3Dltr style=3D"MARGIN-RIGHT: 0px">
 <DIV class=3DOutlookMessageHeader dir=3Dltr align=3Dleft>-----Original Message----- From:=20
 simpits-tech-admin@simpits.org =
[mailto:simpits-tech-admin@simpits.org]On=20
 Behalf Of Wiebe, Alex Sent: Friday, May 17, 2002 10:59=20
 AM To: 'simpits-tech@simpits.org' Subject: =
[simpits-tech]=20
 Lenses for 'warping' projectors? </DIV>
 In my random browsing of peoples pits, I spotted a =
unique=20
 solution for rear projection - using a shower curtain. Whoever did =
that - how=20
 well does it work? Given that a shower curtain is about $5 at Walmart =
and a=20
 translucent projection screen is _way_ more - is it worth the=20
 savings?
 Regarding fresnel lenses: how good are they for off =
angle=20
 viewing? for say side or corner views? Do they only really work if =
you're=20
 facing them straight on?
 My main reason for posting: are there lenses that =
can be added=20
 to LCD / overhead projectors that will stretch / compress the edges to =
fit a=20
 wrap around screen? Ideally for the SpitFire I'd like to make a 6' =
wide x 3-4'=20
 high screen that wraps around the front of the windshield. I'm =
thinking the=20
 viewing angle from left to right would be about 130-140=20
degrees.</BLOCKQUOTE></BODY></HTML>

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