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Lens Shift

A growing number of projectors now come with Lens shift allowing you to position your projector off center to the screen. Horizontal lens shift permits placement either to the left or right of the room, Vertical gives more flexability above or below the screen. Lens shift changes the projected image inside the lens maintaining the maximum resolution of your image. Keystone Correction changes the image projected at the projection panel (lcd or dlp etc.) and reduces the resolution of  the image.

Lens Shift example:

Zoom lens

 If you are using your projector for mobile applications, a zoom lens can be very handy. It gives you the ability to set the projector at a convenient location, and adjust the projected image size. Without a zoom lens, the only way to adjust the picture size is move the projector forward or back. A unit with a zoom factor of 1.2x will only let you adjust picture size by 20%. You can often move the projector a foot or two either way and accomplish the same adjustment. Nevertheless, if you have a fixed screen size you are trying to fill, even a limited range zoom will make it easier to fine tune the image size to the screen.

Short Throw Lenses
 

When the throw distance from the projector to the screen is restricted a Short Throw Lens may be necessary to allow focusing of the image.
 

If your projector position is not flexible and you require either a Short or Long throw lens, Look for a projector that has optional lenses available in our specifications, details of the lenses can normally be found in the PDF brochure. If possible look for a projector that comes with the lens you require as standard, Purchasing lenses separately can be very expensive.