Re: Converging lenses (was: Window reversal); D|s-TortiO|\|s

[P3D Gregory J. Wageman <gjw@xxxxxxxxxx>]

John R. suggested:

>>How about trying to accurately recreate the view of an extreme close-up
>>(for instance, of your hand 8 inches in front of your face)? If you
>>look at a real object that close without using any optical equipment,
>>you'll see keystoning, so if you wanted to recreate the maximum possible
>>realism, you'd need to have keystoning.

Gabriel J. responded:

>Now that might work! Thanks John for a fresh concrete example, that might
>justify keystoning.

Well, I just tried the experiment with a rectangular ticket stub.
I had to get it to within about 4" of my eyes in order to detect any
significant keystoning, but it definitely was there.  Of course, the
image then doesn't fuse; there is considerable doubling at the left and right
ends of the paper (as one would expect).  Overall it's quite a disturbing
experience.  I guess the moral then is that life *does* imitate art.

	-Greg W.


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