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Lens and Optics
If you were buying a camera, you wouldn't put down your cash without learning about what type of lens came with it. The same rule applies to projectors.
With zoom lenses being nearly standard on today's projectors, the important question is how much a lens's f-number (the smaller the number, the more light) changes at different zoom settings. If the change is minimal your image will remain uniformly bright regardless of lens position.
Some lenses are now manufactured using lightweight plastics. If weight is not an issue, try to find a machine with an all-glass lens. Glass is the optimal filter for projecting images and will give you a clearer picture. However, glass lenses do make a projector heavier, so pick plastic if you are going to be on the road a lot. Optional lenses are also available through some manufacturers and resellers. If your conference room machine will be called upon to project at different positions, angles, and brightnesses, you should ask about interchangeable lenses.
Projector Buying Tips:
An Introduction to Projectors
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