Buying Guide · 6 min read · Updated 2026-10-05
Ultra-Short-Throw vs Standard Projectors for Classrooms
Why UST removes glare and shadow problems, what 0.22:1 actually means, and when standard-throw still wins.
The projector's throw ratio decides where it sits in a classroom — and whether the teacher is standing in its beam. This guide compares ultra-short-throw and standard-throw for education buyers.
What throw ratio means
A 0.22:1 ratio produces a 100-inch image from roughly half a metre; a standard 1.2:1 lens needs several metres and typically ceiling mounting behind the audience.
Why classrooms increasingly specify UST
No light in the presenter's eyes, no shadow on the board, shorter cable runs, and far fewer bumped or damaged ceiling units in active classrooms.
When standard-throw still fits
Large lecture halls where the throw distance is available, or budget-sensitive projects where the UST premium cannot be recovered.
Frequently asked questions
Questions on this topic
Does UST need a special screen?
If you send us your screen size, throw distance and ambient-light condition, we will return a written brightness calculation with the ANSI assumptions shown — no generic catalogue answers.