Originally Posted by copene
I think I get it, thanks so much. Maybe what I should do is look at putting it further back and doing 120" screen. Only problem is, like I said, the room is only about 7' high so if I'm starting the image like 16" from the ceiling, the bottom of it is going to be damn near the ground! Also, I've taken into consideration the 8" from the wall. That's what would get me 154". I could try at like 165" and see what happens. I think it's going to be crazy low though.
If from wall to screen is 8" that is enough space for the TV to sit behind the screen.
The projector does not have to be moved to get an 120" screen from 154".
This unit has a zoom.
With no zoom, from 154" the screen is 100".
With 100% zoom from 154", the screen is 120".
You can use the calculator in the post above.
The closer the projector is to the screen, the brighter it will be.
Best to keep it closer.
The offset will be different for an 120" screen.
The height of an 120" screen in 16:9 format is 58.8".
Offset is 110%. That means 5.88" offset, the top of the screen is 5.88" under the center of the lens.
An 120" screen will also have a different drop.
From the Amazon links in the first post, there is only one 120" screen available, with a 24" drop:
From the pdf, the height of the drop is 610mm (B2), and 92mm (B5) for the case height.
That's 24" + 3.6"=27.6"
This screen also has some hinges for ceiling mounting. These appear to be ~1" to 1.5"
Total drop ~29".
Center of lens is 5.88" above, so the lens will be 23.12" from the ceiling.
Note: non tensioned drop down screens are prone to developing waves do varying degress.
Tensioned drop down screens are less prone, but are more expensive.
Generally speaking, eye level should be 1/3rd from the bottom of the screen (height).
Average height of the human eye level is 50 inches (127cm) seated and 60 inches (152.4cm) standing.
7ft(84")-29"(drop)-58.8" (height)=minus 3.8"
For personal adjustment, use this method:
Originally Posted by Dave in Green
What you want to do is lay back in your typical viewing position with your eyes shut. When you open your eyes you should be looking at the vertical point on the wall where your vision naturally falls. For most people that point should be around or somewhat below where the vertical center of the screen should be positioned. The more you can fine tune this before permanently mounting the screen the more comfortable you're likely to be when viewing. When I sit in my reclining chair with eyes shut and then open my eyes my eyesight naturally falls at a higher point on the wall when the chair is reclined than when it's upright.