Optoma makes top-class projectors, and at first look the Optoma HD31UST appears to be like like one other clear winner: a shiny 3,400 lumens score, keystone correction, and extremely short-throw projection in addition.A big a part of the enchantment of house projection is attending to see your favourite motion pictures, programmes, or sports activities matches in an enormous approach, and the HD31UST is ready to ‘throw’ photos onto a wall on 30cm away, with an improbably large 100-inch projection even at that brief distance.But why would you want a short-throw projector – that’s, one that may undertaking a big picture onto a display from a a lot shorter distance than a long-throw mannequin – not to mention an extremely short-throw mannequin like this one?One of the continued hassles of conventional long-throw projection is needing to position your at an acceptable distance away from the wall to make sure a big image; you additionally have to maintain sight traces in thoughts, if you don’t need folks getting out and in of their seats to be blocking the projection.So does the Optoma HD31UST ship? We fired up the HD projector for film night time…Price and availabilityThe Optoma HD31UST retails at £1,149 within the UK (round $1,449), and is obtainable all through Europe, the Middle East, and Africa.That’s a number of hundred kilos cheaper than Optoma’s higher-spec extremely HD fashions, just like the Optoma UHD51A and Optoma UHD60. So you’re getting a drop in visible high quality as a trade-off for that cheaper price, however most currently-available TV and movie content material is in HD/SDR, slightly than UHD, and the HD31UST will probably be absolutely able to displaying it at most high quality.The equal short-throw mannequin within the US is the GT5600, although it comes with a barely brighter 3,600 lumens score.DesignThe Optoma HD31UST sports activities a curiously wavy form, with enticing curves slightly than the flat box-like form you would possibly count on. The projector lens emits mild from the rear finish of the unit, slightly than the entrance, which permits the majority of the equipment to be positioned a bit nearer to the wall when in use.At 343 x 383 x 112mm and 3.9kg the HD31UST is comparatively cumbersome, however it carries that bulk effectively. The end is a crisp white, so whereas it gained’t fade into the shadows throughout a late-night screening, it blends in properly as house furnishing – this isn’t a chunk of equipment you’ll be dashing to cover away when the visitors arrive. In a pleasant contact, the projector’s distant takes the identical wavy define for its underside.The distant comes with directional buttons and a house menu button, and may mute, change between inputs – HDMI, VGA, USB – freeze the video feed, or kill the display solely; most of those buttons seem on the physique of the projector too. There’s additionally a helpful built-in laser pointer, if you happen to’re utilizing the projector for extra presentational or instructional functions.There are loads of ports, with HDMI 2.0, VGA, USB, ethernet and an audio output for connecting to an exterior hi-fi system or speaker. It’s simple to hook up an Amazon Fire TV streaming stick, or join by way of HDMI to your video games console, and change the supply by way of the distant. The projector can be appropriate with 3D Blu-ray or video games consoles, although you may want the Optoma ZD302 3D glasses for an additional £43.99 (round $55).While you would possibly suppose a short-throw projector would pack in barely smaller-scale, cheaper tech, the other is normally true.The kind of lens required for a short-throw projector requires a higher-quality grade of glass, for one – it must do much more refraction of sunshine in an effort to get a large picture at such a brief distance. The Optoma HD31UST solely wants round 30cm respiratory area from a wall or projector display to show in 100 inches, and it’s working arduous to realize that.EfficiencyThe Optoma HD31UST’s efficiency relies upon as a lot on the area you’re utilizing it in because the capabilities of the projector itself.The HD31UST provides a succesful HD image, with out auto vertical correction, and handbook geometric adjustment to assist align the picture even on uneven surfaces.While you’ll ideally be projecting onto a clean white wall, in order to attenuate interference with the image, the HD31UST’s image settings can help you add a refined filter to assist to counteract the colour of your wallpaper.When watching the atmospheric Netflix Original thriller Dark we discovered colours wealthy and correct, whereas the blue tint of our lounge wall was simply corrected for.This is an HD projector, although, slightly than a 4K mannequin or something with HDR (excessive dynamic vary). It isn’t prone to fulfill these after a really high-fidelity photos, and solely actually provides a house cinema expertise when it comes to dimension. The short-throw lens additionally means you’ll be able to’t go a lot smaller than 100 inches when it comes to wall area, making use of the HD31UST considerably rigid.yeasOptoma’s projector can ship a formidable 3,400 lumens, making it splendidly shiny, and greater than able to bringing out that further stage of visible element throughout light-on viewing – though you’ll nonetheless need a darkened room to profit from the picture. You’ll get 4,000 hours of lamp life out of the default ‘Bright’ mode, although that may simply prolong to 10,000 and 15,000 hours with the energy-saving Eco and Eco+ modes, or 12,000 hours at a ‘Dynamic’ setting that tries to differ brightness extra intelligently, relying on what’s on the display.This excessive brightness does, nevertheless, result in some blooming and blurred edges round mild sources – experiencing such results whereas watching the solid of Dark navigate a dim cavern with their flashlights was irritating, even when it didn’t render the present unwatchable.The built-in 16W audio system are a very welcome addition, as their output is in regards to the equal of the mid-range TV you’d possible be changing with this projector. By distinction, the higher-end Optoma UHD51A and Optoma UHD60 pack in solely 5W and 8W respectively. It’s not going to face in for a devoted hi-fi system, however we had no bother choosing up both high-frequency dialogue or extra rumbling sound results.Enhance your own home cinema setup with one of the best soundbars for movies, music, and TVOur verdictThe Optoma HD31UST manages to couple ultra-short throw projection with an immensely shiny picture and thoughtfully designed . For enthusiastic hosts with numerous wall, and never a lot sq. footage, this short-throw projector might be excellent for watching house motion pictures, streaming sports activities broadcasts, or gaming in an enormous approach.However, the 1080p decision gained’t impress everybody. As a projector greatest suited to the house, the HD31UST additionally faces some stiff competitors from an equivalently-priced tv.For an identical price ticket you can get all method of high-quality UHD TVs, slightly than making do with the HD31UST’s humble 1080p decision. Having a compact projector may match higher in your lounge, although, and also you’d realistically be taking a look at a great 55-inch TV – say an entry-level OLED just like the LG B7 – slightly than something approaching 100 inches.And if you happen to can stretch to few hundred kilos/ extra you can additionally go for the 4K and Alexa-enabled long-throw Optoma UHD51A as a substitute.As a succesful, extremely short-throw projector delivering unimaginable brightness, although, the HD31UST nonetheless delivers for the cash.