>-----Original Message-----
>From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] 
>Sent: 23 February 2005 11:32
>To: PIC List
>Subject: [OT] Projector beam offset using "periscope"
>
>
>This is mainly to Tim Page BUT I've sent it to a few other 
>places and people 
>who may be interested as well.
>
>Tim,
>
>Any thoughts on the following?
>
>The GLCC data projector was mounted, as you have seen, on a 
>side curtain 
>wall in a line towards the left of the screen and high enough 
>to be pointing 
>somewhat downwards at the screen. The projector's internal 
>digital keystone 
>correction allowed these horizontal and vertical offsets to be 
>corrected.


Russel I can't really comment on how feasable the periscope would be,
but as a home cinema owner I can tell you that you should avoid using
digital keystone correction as far as humanely possible.  The correction
processing simply applies a variable resizing along the width and/or
height, reducing the resolution of the projected image and degrading
picture quality.  If the mirror arrangement can negate the use of the
keystone correction that would be a bonus.

Problems I could forsee is mounting the mirrors such that they are
easily adjustable in at least two planes and at the same time rigid
enough to avoid any movement, and also keeping them free from dust etc.

Regards

Mike

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