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Brian,<br><br>
good to hear from you.<br><br>
mine mixed with yours:<br><br>
At 03:47 PM 1/22/2008, you wrote:<br>
<blockquote type=cite class=cite cite="">Three quick questions:<br><br>
First, I vaguely remember someone posting a bit back<br>
about rear projection materials. Someone mentioned<br>
something that worked really well, but was on the<br>
pricey side - could whoever it was fill me in on the<br>
details?<br>
</blockquote><br>
someone will give you better guidance here. the backside of most
rear-projection screens has a printed fresnel pattern to break up the
"hot spot" you'll otherwise see from the projector. <br><br>
<blockquote type=cite class=cite cite="">Secondly, I was wondering if
anyone here had played<br>
around with making a lightweight mirror out of mylar<br>
before. I was poking around for some info yesterday<br>
and I found a pretty neat system for pulling all of<br>
the corners tight, seeming to me to make a pretty<br>
distortion-free reflection. Just wondering if anyone<br>
here had played with it before.<br>
</blockquote><br>
precision is the only thing that's going to keep enough quality when you
bounce an image. i have bad feelings about the mylar trick, since you
won't be able to get it flat enough. those front-bounce mirrors are
figured to a very high degree of flatness.<br><br>
there must be lots of optical-quality mirrors piling up as those
dinosaur-sized 3-gun rear-projection TVs find they way to the landfills.
sometimes i see them in those salvaged electronics catalogs, usually
pulled from copiers.<br><br>
<blockquote type=cite class=cite cite="">And finally, I was wondering if
anyone had any good<br>
info on the ratio of projector distance vs. image<br>
size. I'd imagine it probably varies somewhat with<br>
projector model, but a good ballpark figure would be<br>
nice.<br>
</blockquote><br>
try the "projector calculator"<br><br>
<a href="http://www.projectorcentral.com/projection-calculator.cfm" eudora="autourl">
http://www.projectorcentral.com/projection-calculator.cfm</a><br><br>
if you just toss some projector models at it and notice the lens specs,
you'll get a good ballpark guess.<br><br>
<blockquote type=cite class=cite cite="">Brian<br><br>
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all the best,<br><br>
- adm - <br><br>
<x-sigsep><p></x-sigsep>
<hr>
<br>
Alan D.
Mazurka
adm.design@verizon.net <br>
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