ortho seat question (was: Stretch noticed by novice)

[P3D Richard M. Koolish <koolish@xxxxxxx>]

Michael Kersenbrock writes:

> Are you sure he was close to the "ortho seat"?  Whenever I've done
> the calculation for my 5" lens'd setup one almost has one's nose
> to the screen to be ortho.  Well, not quite, but close.  A few rows
> in front of the projector sounds like a stretched spot.


    Here's my question:

	Lets say you had two projectors, one with 5" lenses and
    one with 4" lenses.  If you set up both projectors so the
    on screen images are exactly the same size and in the same
    position, would the ortho seat be different for each projector?
    If not, then the ortho seat must depend only on image size, and
    not projector distance.


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