Re: image brightness

[P3D Glen Murray <grmurray@xxxxxxxxxxxxxx>]

   All this stuff about brighter projector bulbs increasing ghosting doesn't
make any sense to me.  The ghosting is a product of the inability of the
polarizers to work 100%, or the reflecting surface's inability to leave that
polarization alone, right?  So, for any given screen/polarizer pair-up,
you've got a certain contrast range between the images you're supposed to
see, and the ghost images.  That contrast range remains constant with an
increase or decrease in brightness, and when your eyes adjust to the bright
images, the ghosts should look the same.  Brighter bulbs just keep the
projections from being too dark, which, after 5 1/2 stops (2 1/2 per
polarizer, 1/2 for the screen) of light loss, would tend to be that way.
   Course, I've never seen any projected     :(     

        Glen
............grmurray@xxxxxxxxxxxxxxxxxxxxxxxxxx


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