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Original thread:
Post 12 made on Friday February 9, 2018 at 14:42
Ernie Gilman
Yes, That Ernie!
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December 2001
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On February 9, 2018 at 13:49, crosen said...
The 60” drop is from ceiling to top of the screen. That distance is large because the ceilings are 12’ high.

...and what he wrote about? His question was whether you want to drop the projector by the same amount as the screen.

There are also a variety of projection patterns. I'm describing this from the point of view of an upside-down ceiling-mount projector: before implementing image shift, some projectors have the lens at the height of the center of the image, some have the lens at the top of the image, and some have the lens above the top edge of the image. These different types of projector would of course result in different required drop distances and the latter type would require the least drop of the projector.
A good answer is easier with a clear question giving the make and model of everything.
"The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw


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