The LG AU810PB has a manual lens with outer rings on it to control both focus and zoom. With a zoom range of 1.6x and a throw ratio of 1.3:1 to 2.1:1. The throw distances can quickly be calculated based on the width of the screen. For example, on a 100" wide image, the throw distance would be between 113" and 210".
Since screen sizes are often listed as diagonal and to eliminate the need to do algebra, we have provided this chart for easy reference.
Throw Distance for a 16:9 Screen
The AU810PB also offers both horizontal and vertical optical lens shift. This allows placement of the projector at the top or bottom edge of the screen or up to 24% of the width off center. Of course, like all projectors with H&V shift, moving the image in one direction will limit the amount of shift available in the opposite direction.
Maximum shift in one direction comes when the other is perfectly centered. As an example, if you place the projector at the top of the image it would be ideal to center the unit on the width of the screen.
Lens Shift (Horizontal +/- 24%, Vertical +/- 60%)
The horizontal and vertical lens position adjustments are made using two concentric dials on the right side of the cabinet. The image moves as you turn the wheel accordingly until you reach the limits of adjustment. If you hear clicking noises when you turn the dial, that indicates that the dial is slipping and should not be turned further. This will help avoid the damage which could occur from turning a lens adjustment too far.
This ability to move the image location via optical lens shift provides the best image quality as compared to digital geometry adjustments. For a little more adjustability, the AU810PB also includes vertical keystone correction.