Optoma GT3900UHD Short Throw Projector vs Optoma HZ40HDR Projector

Buy the GT3900UHD if you want true 4K and a big picture in a small room. Its 0.49:1 lens throws 100 to 150 inches from about 3.6 to 5.4 feet, and the native 3840x2160 DLP chip keeps full 4K detail. The HZ40HDR is the better fit for a long room with a ceiling mount: it is 1080p native, accepts 4K HDR input downscaled, adds lens shift and a 1.1x zoom, and runs quieter at 27 dB. Both use the same DuraCore laser rated to 30,000 hours, so lifespan is a tie; the real split is resolution and placement.

• Choose the GT3900UHD if your seating is close to the wall, you want a 100-inch-plus image from a coffee table or short shelf, or you need native 4K and a golf-sim mode.
• Choose the HZ40HDR if the projector sits far back or on the ceiling, you want lens shift and zoom to line up the image, and 1080p is enough for your screen size and viewing distance.