k i recently bought the optoma HD70 from costco which came with the 92-in. Panoview Manual Pull-down Screen here:

Link (http://http://www.costco.ca/Browse/Product.aspx?Prodid=10298731&whse=BCCA&Ne=4000000&eCat=BCCA|79&N=4009848&Mo=40&No=7&Nr=P_CatalogName:BCCA&cat=22377&Ns=P_Price|1||P_SignDesc1&lang=en-CA&Sp=C&topnav=)

how do i go about seeing how high i mount it on the wall without having the projector mounted yet?

k i recently bought the optoma HD70 from costco which came with the 92-in. Panoview Manual Pull-down Screen here:

Link (http://http://www.costco.ca/Browse/Product.aspx?Prodid=10298731&whse=BCCA&Ne=4000000&eCat=BCCA|79&N=4009848&Mo=40&No=7&Nr=P_CatalogName:BCCA&cat=22377&Ns=P_Price|1||P_SignDesc1&lang=en-CA&Sp=C&topnav=)

how do i go about seeing how high i mount it on the wall without having the projector mounted yet?

The HD70 has an image offset. Unless you are mounting the PJ upside down to a shelf bottom, you will not be wall mounting your PJ. The offset for 92 inch screen is about 15 or 16 inches.

To understand this in practical terms, if you sat the PJ on the floor, the lens would be about 3 inches above the floor so with the offset, the image would begin 18" up the wall and extend 45" above that. You will need to mount your HD70 upside down as close to the ceiling as possible, unless you have 9 foot or taller ceilings.

So, like I said, on the underside of a very high shelf or from a ceiling mount.

err yea i meant it's going to be mounted on the roof actually

the ceilings are cathedral ceilings about 12 feet high

err yea i meant it's going to be mounted on the roof actually

the ceilings are cathedral ceilings about 12 feet high

Excellent! mountdirect.com has wall mount type mount that will hold the PJ upside down rather than having to put a shelf on the wall and then mounting your PJ upside down on the bottom of the shelf.

Figure out how high you want your screen to go and then add 15 inches to that number and that will tell you how high the projector lens will need to be up the wall.

so no matter what using a ceiling mount and hanging it down i will want to mount it upside down?

I would mount the screen at a level that everybody can see the movie without lifting their heads and the projector has the proper offset.

The HD70 has such an offset to the image that you must either mount it to a low table to project high up on the wall or mount it near the ceiling and upside down to project down the wall. The projector is made to do that. There is a menu to tell it whether the PJ is right side up or upside down.

So here is an example:

You want the bottom of the image to start at 30 inches above the floor. SInce the image is 45 inches tall on a 16:9 format that is 92 inches diagonal, that puts top of the image at 75 inches above the floor. The HD70 is going to project the image 15 inches above the height of the lens so by flipping the PJ upside down, the image is now 15 inches below the level of the lens. 75 plus 15 is now 90 inches above the floor. This is why an 8 foot ceiling is desireable since 8 feet is 96 inches. That gives you 6 inches to mount the ceiling mount and the PJ on the ceiling mount. The ceiling is at 96 inches, the lens of the pj is at 90 inches, the offset puts the image top 15 inches lower down to 75 inches. Since the image is 45 inches tall, the bottom of the image appears at 30 inches from the floor.

NOW, because you have a 12 foot ceiling, you either must put in a ceiling mount with a 3 foot 6 inch drop OR a wall mount that will hold the PJ so that the PJ is upside down and the center of the lens is 90 inches above the floor.

Make sense? :)

^ haha yes very much!

thank you all very much, that cleared up alot