Before I buy, I need to make sure I completely understand the vertical lens shift on this. I almost bought the Marantz VP4001, but realized I could not use it due to the fixed offset.
Here's the facts: 16:9 100" diagonal (49" x 87") SmX AT Screen. According to the throw charts, I can mount this as close as 10' 2" away. I will probably be somewhere between 10.5 - 11'. btw, is this distance from center of lens to center of screen?
My question is with vertical lens shift. With it being inverted and ceiling mounted, what is the minimum and maximum distance from the center of the lens to the top of the projected image? Is there an ideal amount? Is vertical lens shift and keystone adjustment the same thing?
I am building the screen wall right now, where the screen with be somewhat inset into the wall. I need to nail down a height from the ceiling for the screen.
In case it matters, the ceiling is only 89" tall, and I would ideally like to mount the projector as close to the ceiling as possible (flush mount?). I'm not sure if this is possible due to needing adequate ventilation.
Can someone please provide specific and concrete numbers so I can order this dang thing and stop obsessing on this thread!

Thanks!
Jason