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Projector Zoom Lens
Most projectors have a zoom lens, allowing for the adjustment of the image size without the need to move the projector. The type of zoom lens varies from model to model. Some zoom lenses are manually operated; power zooms are motorized. This is a nice feature if you wish to work remotely from the projector. Optional lenses allow you to choose the specific focal length of lens. Without a zoom lens, the only way to adjust the picture size is move the unit forward or back. A note of caution though—many of the micro-portables have zoom lenses with limited range. 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.
Different lenses:
No Zoom - No zoom may be necessary if your projector will always stay a fixed length from the screen.Manual Zoom - Some zoom lenses are operated manually, which require you to be near the unit as you adjust the image.
Power Zoom - Power, or motorized, zoom lenses let you adjust the image remotely.
Projector Buying Tips:
An Introduction to Projectors
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