The Optoma 4K400STx is a true 4K UHD (3840x2160) short-throw projector built for golf simulators and other tight rooms. Its 0.5:1 throw ratio fills a 10 ft x 7 ft 6 in 4:3 screen from about 6 ft 8 in, and 4,000 lumens keeps the image usable with lights on. A dedicated Golf Sim picture mode, HDR10/HLG, four-corner keystone and 4.0 ms input lag at 1080p/240Hz set it apart from standard home-theater projectors. It suits simulator owners and bright-room users more than cinephiles who want deep blacks.
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Rated 4.8 out of 5 from 69 ratings, owners mostly praise the sharp 4K image, brightness and short-throw convenience for simulator rooms. Complaints center on black levels and setup fiddliness rather than the picture itself.
The Optoma 4K400STx is a short-throw projector made for golf simulators. It has true 4K UHD resolution (3840x2160, 8.3 million pixels) and outputs 4,000 lumens. A dedicated Golf Sim picture mode renders greens and blues with strong detail, even with the lights on.
The fixed 0.5:1 throw ratio fills a 10 ft x 7 ft 6 in 4:3 screen from about 6 ft 8 in away, and an 8 x 6 ft 4:3 screen from about 5.3 ft. It supports screens up to 300 inches. A 116% vertical offset and four-corner keystone correction of plus/minus 40 degrees, both horizontal and vertical, allow flexible placement when mounting is imperfect.
Input lag is 4.0 ms at 1080p/240Hz. The projector supports HDR10 and HLG and has a 1,000,000:1 contrast ratio. It has dual HDMI 2.0 inputs, S/PDIF optical audio and a 12V trigger.
