There are even interactive UST projectors that add sensors, so you can draw on the image and give commands the same way TV networks use displays on election nights to show information. Mount a UST projector just above a screen, and you can get close enough to the image to point to text or graphics you want to draw attention to without casting a shadow, much as you would with a whiteboard. Note that UST models can also be useful in business and education. But if you want a projector to use as a 100-inch-or-larger TV at home, and you don't want to deal with mounting it on the ceiling or running cables through walls, a UST is what you want. Ultra short throw (UST) lensing systems (which usually mix a mirror in with the optical elements) are even more expensive than short throw lenses. And if you want a large image in a small room, you need a short throw lens to make the image big enough. But if you have to put the projector far away from the screen-as in, say, a movie theater-you need a long throw lens to get a small enough image to fit the screen. Long throw lenses and short throw lenses are harder to manufacture well enough to project a high-quality image, which makes them, and the projectors that use them, more expensive. What's deemed a standard throw is what you'll find on most projectors. If you're considering buying a projector with a shorter-than-standard throw distance, it helps to understand the categories of short throw and UST in the context of all four throw ranges on the market. Then, we'll cover the key differences between these two categories, along with the factors you need to consider when choosing a short throw or UST projector. In this guide, we'll suggest our favorite short throw and ultra short throw (UST) picks for specific applications, choosing among models we've tested.
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