Originally Posted by ice1874193
is there a formula to figure this out? I was thinking like a 92" screen. given that, how high does the projector have to be off the floor?
The HD70 offset is about 30% so you take 30% of the image height and that is how high above the center of the lens the image will appear on the screen wall.
92" diagonal screen is 45" tall
30% is about 14"
If table mounted:
PJ is on a table 24" high.
Center of the lens is 1.5" above table.
Add 14" for offset
Image appears on screen wall 39.5" above the floor.
add 45 inches for image
Top of image is 84.5 inches above floor, too high for your ceiling so lower your table to 18 inches above floor and image will go to nearly the ceiling.
If ceiling mounted:
6'7" ceiling = 79"
Ceiling mounted PJ center of lens is about 4 inches from ceiling. 75"
Offset for 92" screen is 14". Top of image appears on screen wall at 61"
61 - 45 = bottom of image appears 16 inches from floor. Maybe low for more than one row of seats. Not too low for me!