Originally Posted by Spartans1
I know I am getting ahead of myself before it is mounted just killing time researching,reading and asking questions till it arrives and I get it on the ceiling. I do need to buy a mount and have seen where people have used the various models from monoprice with success. I can move the PJ to the distance you recommend for a 120" and that will be where I start.
Unless those mounts are extremely Low Profile, you might have to move out of the Low Budget models (Universals) and into a Custom arrangement. The Chief RPA ($139.00 @ Visual Apex) comes with a flat Plate (w/spacers) that is dedicated to that specific Projector's mounting holes. The Other part that mounts to the Ceiling is only 3.5" thick. That is absolutely about the closest you'll find ANY Mount will get the PJ to the Ceiling. As I said, a Total of 4"-5" at most from the Ceiling to the Bottom of the PJ, and if recent memory serves me, the center of the Lens will be 2" below there.
So that gives us a approx "Maximum" distance reference of 7" from the center of the lens to the Ceiling.
At a 120" image, the Optoma HD66's Lens Offset figure will be 16". That means if the Len's center is resting at a point 7" down off the Ceiling, you then must add 16" more to that figure and you come up with the "TOP"
of the Image coming from the PJ being 23" down from the Ceiling/Screen wall juncture.
The Screen itself is 59" tall.
59 + 23 = 82"
96" - 82" = 14" (Bottom of the Screen's edge off the Floor)
Not really a good thing, so now you have to Tilt the PJ upwards using the 6 point adjustable screws on the Chief. "On the wall" you watch as you move the Image up at least 10". At that point the image will be decidedly Trapezoidal. Wider at the Top. The Keystone control is then used to "Square" the image. Better get used to that fact. It will have to be done.
The Offset does indeed eliminate the need to "Drop" the PJ's height to clear an obstacle. If the bottom of the Beam is only 10" from the Ceiling, and by using the figures and adjustments I presented, the Top of the Scree's image is now 14" from the Ceiling, it will be close...but the measurements are working in our favor..
Why...if "Tilting" can help mitigate placement issues, can't you use a less expensive mount that might increase your Lens position to 10"-12", just 3" to 5" lower? Because at it's "worst" Keystone corrections can be detrimental to the image by reducing brightness, distorting moving images at the edges of the Screen, and basically detracting from a pristine viewing experience. And lemmie tell something to you.....at 120"...you'll almost certainly notice anything that isn't "correct" if you even begin to try. Some however seem to never try and so get by quite nicely, so what or who's to say.....?
But the purpose of mounting the PJ's Lens just as high as you can "before" Tilting is to reduce the amount of Tilt, and therein the amount of needed Keystone correction, both to their minimums.
So due to the offset I should try to hug the ceiling as much as possible to clear the beam? This was opposite of my noob thoughts of lowering the projector to clear the beam as in a wall mount or drop down ceiling mount. So much to learn yet but it will be sooooooo worth it
Yes. It will be. Few will argue that point. Don't rush. Ask before you "DO". "DO" exactly as your told.
Wear out the Bulb.
That is why I am the noob and you guys are the experts.
Yes we are.
But you'll get plenty of arguments on that point.