Originally Posted by thelonghop
(Question 1- projector central calls it 2.4, this website uses 2.35, actual scope is 2.39- is it just verbiage or are there actual differences in screen sizes and projected images to worry about?)
The wall the screen will be on is 8ft(90in) tall. I plan to center the screen vertically (leaving 15in top and bottom) and horizontally (leaving 14in on sides).
I have two constraints. There is a riser and the furthest back the front row can sit is 9ft. This works pretty well I think- my eye level is about 36in in a recliner, which puts it at 1/3 screen height, leaving a 15deg vertical viewing angle for the top two thirds of the screen. The ceiling vaults to 10ft where the projector will be mounted, and throw distance is 13.5ft(162in). It can move a little further back, but it's prewired for projector install at that location.
Question 2 is, does that throw work for this setup and projector?
On the Epson site projector distance calculator I've entered the following- 16:9, ceiling mount, 10ft width (I'll only have 2.39 for 10ft, but this is the only way to enter 10ft width), ceiling height 10ft, floor to screen 1'3". This gives a Throw distance 13' 7.1" - 28' 6.2" [Ft/in], so my set up appears to barely be within range for throw distance. On the projector central review of the 5040UB they say at the front of the range is better, however using their calculator and a 1.1 gain screen it puts me outside of the 'green' area and into the "recommended image brightness for rooms with ambient light" range. Should that be a concern?
From the vaulted ceiling to center of the screen is 5ft4in (64in). With a drop ceiling mount, I figure it'll come down another 1ft, so make it 4ft4in (52in) from lens to screen center. Using the Epson lens shift checker and 120in wide 16:9 it shows +/- 5ft5in is within range. So I'm ok there, right? The projection distance chart in the manual isn't exactly clear to me though.
Is the front wall 8' (96") or 7.5' (90") tall?
The content in the scope aspect ratios do vary from 2.35:1 to 2.39:1. It's only an inch or two difference in height. I would go with a 2.39 screen and if the content is 2.35 you'll have an extra inch (1/2 inch top and bottom) of image that is projected into the black border of the screen.
At the front of the range is better in that it gives you a brighter image. The calculators for screen size are basing things from the lens of the projector. I would mount the projector at a few inches back from what the calculator gives you to be sure it will fill the screen (or test it on a stand before mounting it). I like this calculator best: http://www.webprojectorcalculator.com/
The ProjectorCentral one just uses the brightest mode for how bright the image will be (and you don't want to run in that mode due to color issues). If you follow that link it shows that the various modes will give you for brightness. There is also a manual iris you can use on the projector to dim the image if it is too bright.
You can't shift the image 5' 4" vertically at that image size and still get a 16:9 image down to your scope screen. The Webprojectorcalculator will give you the correct amount of shift you have. The math for how much you can shift the image is 94% of the 16:9 image height for your screen's height. So for your 120" wide scope screen you get a 50" high 16:9 image, .94 x 50 = 47" plus or minus from the center of the screen. If your screen is 18" off the floor the projector lens can only be 90" off of the floor. The more you use the lens shift vertically the less you can use it horizontally.
Are you doing an acoustically transparent screen? If not I would consider raising your screen up to about 24" from the floor so you have some more room for placing the center channel. With the screen 24" off of the floor you can have the projector lens a maximum of 96" from the bottom of the floor.