I'm in the preliminary planning stages of a quasi dedicated Home Theater Room in a loft conversion. A Murphy Bed needs to go in the room and it can only be on the wall the projector needs to be on. I want a High Gain screen like the 2.4 HP's for use with 3D and a PTAE7000. These means I want the PJ as close to eye level as possible. Table or ceiling mounting is not possible. Centering the AE7000 lens in relation to the screen is not possible as that point is within the foot print of the Murphy bed in the Folded away position. Giving away some Gain to enable mounting the PJ higher on top of the Custom Murphy Bed wall to wall unit is not possible because that puts the PJ Lens out of the Vertical foot print of the screen which prevents the Auto Aspect ratio switching for my 100" Wide Cinemascope screen.
After some research I see that the Horizontal lens shift of this PJ is +or- 26%. I assume this means 26 inches on a 100" wide screen. If my assumption is correct this means I could mount the PJ on a shelf of the unit just above head height and offset from the centre line of the screen 26 inches which is outside the foot print of the Murphybed. While I need to ask the guys in the AE7000 thread whether this horzontal lens shift offset will affect the Auto aspect ratio switching, you are the guys to ask about the affect on gain.
The room is 124" wide. The large couch that butts up against the murphy bed is 122" wide. The screen is 100" Wide. The PJ lens will be about 15' back from the screen. The eye position seated is about 14" back from the screen. In short, the seating area is within the boundaries of the screen width and 14' back.
I did a previous test using the gain calculator which I have since lost on my PC and can't find which gave me 2.2 gain for the hot seat with a centered PJ over the head. Inputting that into the Projector Central calc gave me approx. 32 foot Lamberts with the AE7000. Thats pretty amazing !!
However, what effect would moving the PJ 26 inches offset from the centerline have on gain. Does the hotseat just shift to the outside seat of the couch on that side but the far side still stays within the 30º cone. Or does the cone shift with the PJ (even though the screen didn't move in relation to the seating) which puts the seat on the far side of the couch outside of the cone??