Originally Posted by k-y
I have almost the same dimensions as utee05 and at a throw distance of 15', the HD20 projects a 136" diagonal image. The HD20 is mounted on a shelf about 5' off the ground, and I had to tilt the PJ down a bit for the image to be flush with the top of my ceiling molding.
I found a smoking deal on a Da-Lite motorized 120" screen.
From the veterans, what's typically the order in which you design your room?
Do you find a desirable mounting platform/location first, then determine how big an image you want, then mark off the image dimensions and that determines where you'll mount your screen? I suppose I can adjust the zoom so my current image comes down to 120".
HD20 is a fixed offset projector. Setting it on a shelf will point the image up at the ceiling. You would need to mount it upside down. Though some have literally set PJs upsidedown on soft material. But I don't recommend that and it would make the PJ next to impossible to fine tune placement.
Being that the HD20 is a fixed offset projector. It has no optical lens shift. I would first start with the Projector Calculator.http://www.projectorcentral.com/proj...ulator-pro.cfm
It will show you tons of info for the planning stage. Such as the offset measurement based on image size and projector distance.
Steps in general that I like to follow with fixed offset projectors:
1. Projector Calculator for planning.
2. Mount the PJ so that hopefully you are not at either zoom extreme to get your desired screen size. Having some zoom range left for final adjustment is nice.
3. Project and full blank output. I just use the default PJ blue "no source" or built in test image so I don't have to deal with cables yet.
4. Tape on wall where the projected image falls.
5. Use the taped area to mark the exact center line from left to right.
6. Buy or Make the screen and mount it. based on found center line and top edge.
My last screen was a "floating" screen about 8" from the wall. So I had some extra steps involved. But if you mounting your screen right at the wall with either a fixed or pull down screen, those steps work great for me with fixed offset projectors.
if you are doing a pull down screen that will be far from the wall, use the numbers from the calculator and still mount the PJ first. And still use a middle zoom range, mount the screen and adjust.