[AG-TECH] projector/room setup

[Osland, CD (Chris)]

From: Ulrich Schwenn [mailto:schwenn at rzg.mpg.de]

> There is a little help if you consider one of the NEC beamers namely the 
> the GT950, which allows an optical lensshift of +/-55%, bringing the 
> beamer quite a lot out of sight even for  low videowalls.

That's interesting - I'll have a look for prices for it in 
this country.

Can someone clarify the specification - I've looked at the PDF
spec sheet and the +-0.55, +-0.85 is not clear to me.  For
instance the Panasonic projectors I use have fixed optical
geometry.  If they are on a table (normal way up) and you consider
a horizontal line through the optical centre of the lens, the
image on the wall is about 95% above the line and 5% below - the
imagined line would be about 6 inches above the bottom edge of
the image at about 10 feet throw.  Would this, in the terms used
in the NEC spec, be +0.95 or +0.475?  I can see arguments for
both.

Many thanks

Chris

____________________________________________________________________
Chris Osland                         Office tel: +44 (0) 1235 446565
Digital Media and Access Grid      Medialab tel: +44 (0) 1235 446459
BIT Department             Access Grid room tel: +44 (0) 1235 445666
e-mail:   C.D.Osland at rl.ac.uk               Fax: +44 (0) 1235 445597

CLRC Rutherford Appleton Laboratory (Bldg. R18)
Chilton, DIDCOT, Oxon OX11 0QX, UK

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-----Original Message-----
From: Ulrich Schwenn [mailto:schwenn at rzg.mpg.de]
Sent: 20 December 2002 07:43
To: Osland, CD (Chris)
Cc: 'Andrew Daviel'; 'ag-tech at mcs.anl.gov'
Subject: Re: [AG-TECH] projector/room setup


There is a little help if you consider one of the NEC beamers namely the 
the GT950, which allows an optical lensshift of +/-55%, bringing the 
beamer quite a lot out of sight even for  low videowalls.
Sinc
Ulli

Osland, CD (Chris) wrote:

>>The more I read about keystoning and throw distances the more
>>trouble I am having trying to figure out how to do it.
>>    
>>
>
>To get a 5' high videowall, with the centre of the wall at the
>height of an adult's eyes when seated, without the projector
>being so low it was regarded as a safety hazard, I use a
>projection screen (21' x 6') on a frame which I rest against
>the wall with the base of the frame toed out from the wall.
>
>The screen is perforated and the (4) speakers are ranged along
>the wall behind the screen.
>
>Cheers
>
>Chris
>
>____________________________________________________________________
>Chris Osland                         Office tel: +44 (0) 1235 446565
>Digital Media and Access Grid      Medialab tel: +44 (0) 1235 446459
>BIT Department             Access Grid room tel: +44 (0) 1235 445666
>e-mail:   C.D.Osland at rl.ac.uk               Fax: +44 (0) 1235 445597
>
>CLRC Rutherford Appleton Laboratory (Bldg. R18)
>Chilton, DIDCOT, Oxon OX11 0QX, UK
>
>[The contents of this email are confidential and 
>are for the use of the intended recipient only.
>If you are not the intended recipient do not take 
>any action on it or show it to anyone else,
>but return this email to the sender and delete your copy of it.]
>  
>

-- 

*Dr. Ulrich Schwenn *


Head of Multimedia and Videoconferencing Group
Computing Center Garching
Max-Planck-Gesellschaft &
Max-Planck-Institut für Plasmaphysik
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D-85748 Garching, GERMANY
Phone: +49 89 3299 1371
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e-mail: schwenn at rzg.mpg.de <mailto:schwenn at rzg.mpg.de>
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