simulator makes local news

Jose writes:

I'll bet it would be more in focus. I don't think lenses are designed
to take the straightness of a screen into account, and we just put up
with blurry edges and a sharper donut.

It would be blurry. In order to project an image sharply onto all points of a
curved screen, you need a special lens, or a special projection source (if the
projected image is also curved in the right way, it will be projected onto a
curved screen correctly, but that would be very unusual--nobody is created
curved primary image sources for projection).

In large simulators multiple lensing systems _in front of the screens_ are
often used to produce collimated projections that appear to reside at
infinity, which is the most realistic way to present the visuals (anything
more than 20 metres or so away is pretty much at infinity for human vision).

--
Transpose mxsmanic and gmail to reach me by e-mail.

On Thu, 08 Feb 2007 20:41:38 -0500, Margy Natalie
wrote:

Jay Honeck wrote:
I see three projectors. Unless they have very special lenses indeed,
I don't see how they can project clear images onto curved screens.


Setting up the over-lap between the screens so that it doesn't look
weird must be a tricky affair, indeed.

(Gears turning...where can I mount a curved screen? Whey can I even
*buy* a curved screen? :-)
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"

http://www.e-planetarium.com/

You can run movies in them too.

They are called planetariums:-))
There they build the curved surface and then spraypaint the reflective
surface on it.


Margy
Roger Halstead (K8RI & ARRL life member)
(N833R, S# CD-2 Worlds oldest Debonair)
www.rogerhalstead.com

On Dec 30 2006, 8:29 am, "Jay Honeck" wrote:
I see three projectors. Unless they have very special lenses indeed,
I don't see how they can project clear images onto curved screens.

Setting up the over-lap between the screens so that it doesn't look
weird must be a tricky affair, indeed.

(Gears turning...where can I mount a curved screen? Whey can I even
*buy* a curved screen? :-)


Jay -
see http://www.panoramtech.com/resource/spie1.html about complex
projection surfaces and multiple projectors - the theory behind it

also: http://www.vistasystems.net/ for boxes that do it.....


Randy