[geeks] paint that retains polarisation?
francois.dion at gmail.com
Tue Sep 30 12:47:32 CDT 2008
On Fri, Sep 26, 2008 at 1:53 PM, Francois Dion <francois.dion at gmail.com> wrote:
> But back to my original question. I'm looking to retain as much of the
> light polarization as possible. Why? For 3D.
> I have a mirror splitter/combiner in front of the projector, using 4
> mirrors, and in front of that, a pair of linear polarizing filters.
> One at 45, the other at 135 degree. I have the matching 45/135 glasses
> with a metal frame, aviator style, same type of polarization as IMAX
> theather. This is different than the Real D system which uses circular
> polarization, but it is the same concept.
> I feed the projector from my HTPC, with mplayer displaying the movie
> in an over/under setup, so my mirror setup is vertical. The external
> mirrors are aligned so that the two images are superimposed. Up to
> now, all is good. But the paint on the wall doesn't retain enough of
> the polarization and it is ghosting way too much.
Contacted Behr and they replied that they dont have polarization
retention as data for their paint. Not surprising. For now I'll use a
retractable silverscreen (da lite, from a bygone era). It is smaller
than what I wanted (about 65" diagonal fully extended but about 54"
usable in cinemascope ratio) but it'll do for now.
BTW, Panasonic just demoed a 3d bluray system:
Of course the person doing the review is a bit confused. Polarised
systems have always been used in theaters since the 1950s. It would be
surprising he saw presentations in anaglyphic format (red/blue or
red/cyan) outside of his house...
The good news in all of that is that if they get this to market, we
will finally see home movies in dual stream or over/under format
instead of field sequential or anaglyph.
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