Turning our attention to the UHD55’s innards, it uses a single-chip DLP optical system delivering a claimed 4K resolution. An attraction it bolsters by keeping input lag to an impressively low 16.9ms when running in its Enhanced Gaming mode. The HDMIs support 4K at 60Hz or HD at 120Hz, making the projector potentially attractive to gamers. This is rated to 10W, more than you get with most integrated projector sound systems, but it only feeds into a single mono speaker. These latter ports alert us to the presence inside the UHD55 of a built-in audio system. ![]() The large lens delivers a throw ratio of 1.21:1-1.59:1 and a solid 1.3x level of optical zoom, while connections include two HDMIs, three USBs (one for 5v output or service use only), a VGA port, an RS-232C control port, a 12v trigger port, an optical audio output, and a 3.5mm phono audio loop through. ![]() ![]() Working our way from the Optoma UHD55’s outside in, it’s great to find a projector this affordable providing vertical image shifting to help you get pictures in the right place without having to mess about with image-distorting keystone correction.
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