PJCalc shows the center of my screen as being 37" below the ceiling for the installation I'm doing. Since I'm not using the factory mount, how do I calculate the actual position? Is PJCalc assuming that the PJ is mounted flush with the ceiling?
Depending on projector and mounts the PJ CALC program takes into consideration that the bottom of the projector is a few inches from the sheetrock on the ceiling. You need to figure out the measurments show on PJ CALC from the actual bottom of the projector to the top edge of the screen, then recreate them acording to your installation no matter how close the pJ is to the ceiling the distance from the bottom of the projector to the top of the screen will be the same.
Actually PJ Calc is simply showing you where the projector is in space relative to the bottom of your screen (for a ceiling mount). It is up to you to determine how high the screen is, how high your ceiling is and fill in that info which will then tell you what you have to do to determine how to mount your projector.
That picture shows the throw distance. It is the measurement from the screen to the projector only. Again depending the your projector and mount, really the mount (the picture was for a SONY 12XX) and space between the ceiling and projector chasis this will make for differances as to the position of the screen. Do you have the 12XX manual? It might have more detailed drawings of the installation versus what PJ calc tells you to do?
For instance acording the Pj calc my Pj shoud be at around 4 feet up from the floor for the throw distance I have it set up at. well I can walk under my projector and Im taller then 4 '
I am hanging my projector as I write this and I am also curious about the screen position relative to the projector. In the pjcalc picture is the 46in measurement from the bottom of the case, bottom of the lens or center of the lense.
That's 60" from the bottom of the projector (top) to the bottom of the screen. Now the screen is some distance off the floor, say 24" which means that the projector is really 84" off the floor.
A rule of thumb w/ sony's is that the lenses are going to be at about the same height as the top of the screen or a little higher. You can actually mount the projector higher or lower but you won't mount the projector level in order to do it. The lens angle is fixed at 15 degrees or so. PJ Calc will allow you to change the lens angle and it will recalculate the position.
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