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P3D Re: optics of stereo viewers
- From: roberts@xxxxxxxxxxxxxxxxx (John W Roberts)
- Subject: P3D Re: optics of stereo viewers
- Date: Sat, 3 Jan 1998 10:10:26 -0500
>Date: Sat, 3 Jan 1998 01:21:18 -0700
>From: "Greg Wageman" <gjw@xxxxxxxxxx>
>Subject: P3D Re: optics of stereo viewers
>Larry,
>I'm curious. What kind of computer monitor do you use?
>The reason I ask is because, as you probably are aware, the screens of most
>computer monitors are spherical. There are a few so-called "flat screen"
>monitors, which are in fact not flat, but cylindrical (curved in one direction,
>rather than two). The reason with this has to do with the physics of making a
>large, glass surface strong enough to withstand 1 atmosphere of pressure over
>the screen surface with a near-vacuum inside without imploding.
Sometime in the last week, I saw an ad for monitors, claiming "true flat
screen". I don't believe it mentioned whether the front surface and rear
surface are *both* flat. If I can find the ad again, perhaps the manufacturer's
web page will explain.
>Most people who routinely use spherical screens are not aware of the curvature,
>until they have an opportunity to use a "flat" screen, and then when they switch
>back the "pincushion" distortion becomes very obvious.
The distortion shows up very well in photographs. I usually recommend that
if people want to photograph a CRT television or monitor screen, they should
use a telephoto lens and set up the camera as far from the monitor as they
can get it (ideally filling the field of view of the photo with the screen) -
that will at least reduce the effects of the distortion (and help with focus
too).
John R
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