Our take
The D855ST is a presentation-oriented DLP model with native 1024 × 768 XGA resolution, 3,000 ANSI lumens, and a fixed 0.66:1 short-throw lens. Those are specific planning facts for a meeting room where projector distance is constrained. It uses a 220 W lamp and presents a 4:3 image, so lamp condition, source format, and screen geometry remain important. The ratio is short throw, not ultra-short throw. Its older HDMI, DVI, and VGA connections suit equipment that can feed them, but should be checked against today's source devices.
Business or classroom presentations where a measured short throw and XGA format match the existing room.
It is not a fit for a close-wall UST installation, native widescreen Full HD, battery use, streaming apps, or a buyer who wants a variable zoom lens.
Pros & cons
What could work for you, and what to consider before buying.
What works in its favor
- Vivitek specifies native XGA 1024 × 768 and rates output at 3,000 ANSI lumens.
- The 0.66:1 fixed lens supports short placement when the room cannot provide a traditional throw distance.
- The data sheet documents a 10 W speaker alongside HDMI, DVI, VGA, and control connections.
What to weigh up
- Its native 4:3 XGA format provides less widescreen detail than WXGA or Full HD.
- A 220 W lamp requires maintenance, and the condition of a used lamp is unknown.
- The fixed short-throw lens requires careful screen measurement and is not UST.
The key details
| Model covered | D855ST |
|---|---|
| Image format | 1024 × 768 native XGA DLP |
| Rated light output | 3,000 ANSI lumens |
| Placement | 0.66:1 fixed short-throw lens; not UST |
Performance figures are manufacturer claims. Source checked October 7, 2026. Regional models and included accessories can differ.
What the features mean for you
Fit the XGA image to the room's material
Vivitek specifies native 1024 × 768 XGA resolution with a 4:3 image format. That can work naturally with older slides, documents, and presentation material designed for XGA, while widescreen video and newer computer layouts may display with unused space or require scaling. The format has less fine detail than WXGA or Full HD, particularly for dense spreadsheets and small type. Before replacing another meeting-room projector, check the source computer's resolution, preferred aspect ratio, and the screen shape. The model is best judged by how it fits existing presentation content, not by a generic claim of accepting high-resolution signals.
Use the ANSI rating as one room-planning input
Vivitek rates the D855ST at 3,000 ANSI lumens, making the output basis explicit. That can inform a presentation-room comparison with models that use different or unspecified lumen methods. It does not promise a particular result in a bright room: ambient light, image size, surface, lamp mode, and the lamp's age all affect the actual picture. For a used unit, ask for the lamp-hour record and inspect the displayed image for even focus and color. The ANSI figure describes the manufacturer's model rating, not a fresh measurement of the projector being offered.
Measure the fixed short-throw lens
The official data sheet lists a fixed 0.66:1 short-throw lens. This lets the projector sit closer to the screen than a traditional lens for a given image size, which can be useful in a shallow classroom or meeting space. It is not an ultra-short-throw design and it has no zoom range for changing the geometry after installation. Measure from the lens to the screen, confirm the image width, and consider the mount or table height before buying. Because the lens is fixed, small placement errors may require moving the projector rather than turning a zoom ring.
Plan around a lamp and older connection panel
Vivitek identifies a 220 W lamp and lists HDMI, DVI, VGA, and control ports. The manual describes a 10 W speaker, so a basic room can use the projector's own audio, while larger meetings may need separate sound. Lamp-based projection entails eventual service and an original lifetime claim cannot show remaining hours on a used example. Check that the computer or media source exposes one of the exact inputs, and that any required adapter carries the intended signal. These connectors can make the D855ST useful in a legacy room but require more planning than an assumption that every modern device will connect directly.
Do not mistake keystone or proximity for UST
The D855ST's short-throw ratio is the relevant placement fact; keystone adjustment, if used, does not change the lens classification. A short-throw projector can reduce shadows and keep the unit near the screen, but its fixed geometry still needs an exact measured installation. It will not sit at the wall like an ultra-short-throw model designed for that purpose. Align the projector squarely with the screen, leave clearance for ventilation and cables, and only then consider image correction. That approach preserves the usable projected area and avoids selecting the wrong room category based on the word short in the model description.
Check whether this is a good replacement for your room
The D855ST is most compelling when an existing presentation room needs a bright-rated XGA image from a short but not wall-adjacent distance. It is less suitable when the room expects widescreen Full HD, when several mounting positions may be tried, or when the source relies on modern streaming apps. Confirm the exact D855ST model label, lamp hours, image uniformity, focus, ports, and remote on the particular unit. The official sources establish its model features, not the condition of an individual projector. Treat this as a source-based role assessment rather than a hands-on or room test.
What else to compare
For a conventional presentation projector with more placement distance and a 1.2× zoom, compare the Optoma TX700; for a portable battery unit, compare the LG PH150B or Philips PicoPix Micro 2.
Before you buy
Is the D855ST ultra-short throw?
No. Vivitek specifies a 0.66:1 short-throw lens, which is not classified here as ultra-short throw.
What is its native resolution?
Vivitek lists native 1024 × 768 XGA resolution in a 4:3 format.
Are the 3,000 lumens ANSI?
Yes. The official D855ST data sheet labels its 3,000-lumen rating as ANSI lumens.
Where can I check the current price?
Use the Amazon link for current offers. Check the exact model, seller, product condition, delivery, and return terms. This page does not display a live price or confirm stock.
Sources & review basis
We use the following manufacturer documentation for the product features above. Our suitability notes and buying advice are editorial judgments based on those features, not measured performance results.
- Vivitek D855ST product page, data sheet, and manual ↗ — checked October 7, 2026.
- Vivitek D855ST product page ↗ — checked October 7, 2026.
- Vivitek D855ST/D857WT official data sheet ↗ — checked October 7, 2026.
- Vivitek D855ST family official manual ↗ — checked October 7, 2026.
The decision
The Vivitek D855ST suits presentation rooms that need a fixed short-throw XGA image and an explicitly ANSI-rated output. Measure carefully and verify the lamp and legacy inputs on a used unit.
Is it the right fit?
Check the exact model and today’s offers on Amazon.