When the projector is on a flat surface (shelf/table) the image is projected at approx 30 degrees upwards of the centreline of the unit.
i.e. if you place the projector on a waist-high table, at 10 feet half the image is on the ceiling.
is there any way this can be adjusted (it is not a menu option; this adjustment is a matter of pixels, the issue here is a matter of feet!)
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try bringing the screen up as close as possible to the projector and still get a focused picture. check keystone here and also for image clarity. if you still have problems, check for dust or moisture etc in the optics. check the lamp for a clean front surface. clean the air filter also. Try a different image source for differences
For best results, slant the screen forward slightly so it meets at a 90
degree angle with the projected image light beam. In not, then a keystone effect
results where the projected image is taller on top or on the sides; in other
words, the projected image is a parallelogram, not a square.
Projectors, in general want to project the bottom of the image 1 foot above the lens at a typical range. When mounted upside down, they project the top of the image 1 foot below the center of the lens. If you don't want to turn the projector over, you'll have to change the angle and probably go to the extreme on the keystone correction.
IF I understand the problem from the limited info in your question, the problem is a distorted picture on whatever surface [probably a wall, or screen] onto which the image is projected.
With all lenses, the axis [centerline of the lens projected] MUST be absolutely PERPENDICULAR [in both the vertical and horizontal planes] to the perfectly plane [flat] surface onto which the image is projected.
IF for example, the projector is mounted in a rear corner of the room, and the camera is aimed downward and to one side to project the image on the center of the opposite wall, or a screen located there, the image will be distorted. It will be larger on one edge [fartherist from the lens] and smaller on the opposite [nearest] edge.
If it is non-perpendicular in only one axis, then two opposite edges will be different lengths, and if out of perpendicular in two axis then no edges will be the same length.
The solution to this problem is that the center axis of the lens must be perpendicular to the surface projected on, in both vertical and horizontal axis.
The issue has to do with something called "Keystone". This allows you to set the projector at an angle and project on an angle. When you set the projector on a flat surface, you would need to adjust the keystone to get rid of the "trapazoid" look of the image.
I don't know that particular model, but usually these are hung u pside down and the projector can flip the image. That should take care of it. Also, depending upon the angle to the screen, you may need to adjust the "keystone" as well. That will allow the final picture to be square as if the projector was at the correct angle.