Re: silver screens

[bercov@xxxxxxxxxx (John Bercovitz)]

 John Dukes writes:
 
> one screen that
> you missed--and very worthy of discussion--is a focussed silver
> screen such as the Ektalite or TV projection screens, neither of which
> is common, but both of which can, with persistance, be found.

Those used to be pretty common in the surplus catalogs.  My concern
is that I don't how you would focus across the concave screen.  Most
projector lenses are made for flat-to-flat but some are made for curved-
to-flat.  Let's see, would the curved-to-flat lens work if you projected
a glass-mounted slide?  I can't remember which way a slide pops so I can't
say.  Then there's the matter of quantifying the curvature.  It would be
very lucky indeed if the curvature of a curved lens used with a flat
transparency just happened to match the curvature of the screen.  But
you no doubt have real experience with this which is worth a whole lot
more than a bunch of theorizing.  So what's your experience with the
corner to corner sharpness?

John B


------------------------------