Where should the lens sit on the wall or ceiling? Enter your screen size, how high the screen starts, and the projector offset to find the lens height.
How it works
Projectors do not shoot straight out of the lens. Their vertical offset, shown in the specs, tells you how far above or below the lens the image sits. On a table, the bottom edge of the image sits above the lens by that percentage of the image height. On a ceiling mount, the top edge sits below the lens by that percentage.
Example: a 100 inch 16:9 screen is about 49 inches tall. With a 10% offset, the lens sits about 5 inches above the top edge for a ceiling mount.
Frequently asked questions
Where do I find the vertical offset?
Look for offset, lens shift or vertical position in the projector manual or spec sheet.
Does lens shift change this?
Yes. Lens shift lets you move the image up or down, so the answer here is a starting point, and shift gives you extra room.
Can I use keystone instead?
Keystone correction can squash the picture and lower image quality. It is better to place the lens at the right height.
