I bought a Elite Screen ER100DHD3 some time ago, still unpacked, but after doing some math for the upcomming installation I am starting to fear it might not work in my setup. I would greatly appreciate some help.
It's an ALR screen and according to the guideline (which I should have checked earlier) the projection angle from my projector to the center of the screen should be mirror-opposite to the angle of my sitting position eyes level.
But when I mount it where I intend to, the mirror-opposite of the projection angle would be right around my belly, not my eyes. Would this be a problem? Would I lose more from this far from perfect installation, then I would gain from the ALR properties of the screen?
A little info about my setup.
Screen: Elite Screen ER100DHD3
Projector: Epson TW9400/6050UB
Room: Living room, full light control, but with non-treated surfaces and light colored walls (and hence why I opted for the ALR screen)
Mount: Ceiling mount, upside-down projector, about 5-15cm. below ceiling, either ELPMB30
; the ELPMB30 has angle rotation up to 8° + the vertical lens shift of the projector, I do not how to really calculate those and how they would affect the setup overall, or in the context of the ALR screen angles requirements
Ceiling height: 250cm.
Screen mount: 70cm. from ground level
Sitting position: about 380cm. from screen
Current calculations say:
Projecting distance (from lense) to center of the screen: 380cm.
Angle required with planned ceiling mount to hit center of screen: -12°
The mirror-opposite of +12° would hit my belly, not eyes. :/
Rough calculations say I should mount my projector around 60cm. below the ceiling to get a -6° when hitting the center of the screen and the mirror-opposite +6° would be around my eyes level.
But with such a setup the projector would be right above my sitting position, I would literally hit my head when standing and it would be horrible from a purely aesthetic pov. So it's a no no for me.
Here is a rough model with the calculations of my setup:
I am sorry for the long post, but I would really appreciate some help.
Would this setup work? Is it a big problem that the mirror-opposite angle of the projection would be way below my eyes level?
Would I be better off returning the ALR screen and opting for a regular white or gray screen, even though my room doesn't have proper treatment (it would be fully light controlled, but still - light colored walls would reflect a lot of light I believe)? The thing is I am way past the return window for the screen (it's been laying around for months, unpacked), so it might be difficult to replace, but if that's the preferable option...
Thank you in advance.