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Re: Shift lenses

  • From: P3D William Carter <wc@xxxxxxxxxxxxxxxxxxx>
  • Subject: Re: Shift lenses
  • Date: Wed, 28 Aug 1996 06:42:51 -0700
John B sez:

>First I focussed the projector on the screen.  Next I stuck the prism 
>in the beam and got an image at a different elevation on the screen.  I 
>measured the keystoning.
 ^^^^^^^^^^^^^^^^^^^^^^^

Huh? Wha..!?! Keystoning?
(Oh. Well, nevermind.)

>I...changed the angle of the projector...(and)tried it with the apex 
>line horizontal and up and with the apex line horizontal and down. I 
>again measured the keystone. Got exactly the same number. Now what did 
>I do wrong? I'm stumped.

But, that part makes sense to me. 
Is this a case of "Whose on first!" or ia it too many Moes, and not 
enough Larrys? (Neyak! Neyak!)

I'll go look for some literature on the subject. Meanwhile, back to the 
question of using falls... what fl. lens do you project with?
 

-- 
                wc@xxxxxxxxxxxx
    37deg 39.09'N x 122deg 29.56'W x 90'MLLW





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