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Most projectors have a zoom lens, allowing the adjustment of the image size without moving the DLP or LCD projector. A projector with a zoom factor of 1.2x will allow you to adjust the picture by only 20%. Look for a DLP or LCD projector with a higher zoom, as it will allow you to present an image that will match most any screen size.
Some zoom lenses are maneuvered manually. For these manual zoom lens projectors, you typically adjust the zoom above the lens.