P3D Re: lenticules

["Greg Wageman" <gjw@xxxxxxxxxx>]

>From: bob porter <bporter3d@xxxxxxxxxxx>
>
>
>>Does anyone know the LPI (lines per inch) of these lenticules? Or what
>angle
>>of view they represent?


Here it is.  I found this at http://www.da-lite.com/edu_1995august.html

"Since the Super Wonder-Lite™ screen has a pitch of 42 ribs/inch, about
half of its active surface area is sloped and the other half flat. In a
sense, therefore, it is two screens in one: each has a high gain (due to
its metallic coating which is much more mirror-like than the standard
matte white diffuser) and a resultantly narrow viewing angle. But
because one narrow viewing angle is aimed at the center of the audience
field (this is all the flat parts of the screen) and the other narrow
viewing angle is aimed at the edge of the audience field (all the sloped
portions), the combination of the two produces a front projection screen
with a gain of 2.5 and a horizontal half-angle of approximately 35
degrees."

     -Greg W. (gjw@xxxxxxxxxx)