Optoma UHD35STx: Specs, Throw Distance & Alternatives
A short-throw 4K gaming projector with a lamp light source. Optoma rates it at 3,600 ANSI lumens and about 4 ms input lag at 1080p/240 in Enhanced Gaming Mode, with ProjectorCentral listing 16.9 ms at 4K/60. It has a fixed lens with no lens shift, and no smart TV system or wireless.
Is the Optoma UHD35STx right for you?
Good for
- Console gaming at 4K/60 (listed at 16.9 ms)
- High-refresh PC gaming at 1080p/240 (rated 4.2 ms)
- Short-throw placement: a 100-inch image from about 3.6 ft (0.5:1 throw ratio)
- HDR10 and HLG content, with a 10 W built-in speaker
What to plan for
- No built-in streaming or wireless: add a streaming stick (the USB-A port supplies 1.5 A of power)
- No lens shift and no optical zoom, so placement has to be planned
- 4K input is limited to 60 Hz (HDMI 2.0); 240 Hz works at 1080p only
- Audio out is 3.5 mm and S/PDIF optical, with no ARC or eARC listed
- Lamp rated for 4,000 hours in Bright mode (10,000 in Eco, 15,000 in Dynamic)
Based on manufacturer specifications and published reviews (sources below). We don't do hands-on testing.
Optoma UHD35STx specs
| Resolution | 4K UHD (3840 × 2160, 0.65-inch single-chip DLP) |
|---|---|
| Brightness | 3,600 ANSI lumens (Optoma rating) |
| Display technology | DLP |
| Light source | Lamp (240 W) |
| Lamp life (Bright mode) | 4,000 hours |
| Contrast ratio | 1,000,000:1 dynamic (Optoma rating) |
| Throw ratio | 0.5:1 |
| Lens shift | None (fixed 116% offset) |
| Max refresh rate | 240 Hz |
| HDMI ports | 2 (HDMI 2.0) |
| Speakers | 10 W |
| Weight | 7.72 lb |
How far from the screen?
Lens-to-screen distance for a 16:9 image, calculated from its 0.5:1 throw ratio. The lens is fixed, so the distance sets the image size.
| Screen | Distance |
|---|---|
| 80″ | 2' 11" |
| 100″ | 3' 8" |
| 120″ | 4' 4" |
| 150″ | 5' 5" |
Optoma UHD35STx input lag by mode
| Signal | Input lag |
|---|---|
| 1080p / 240 Hz (Enhanced Gaming Mode) | 4.2 ms |
| 4K / 60 Hz | 16.9 ms |
Source: Optoma’s published rating and ProjectorCentral’s listing (Optoma’s spec table rounds the first figure to 4 ms); we found no independent measurement. Its fastest figure (4.2 ms at 1080p / 240 Hz (Enhanced Gaming Mode)) is quicker than 77 of the 96 projectors with a lag figure in our input lag database, which lists each model's fastest mode.
Optoma UHD35STx alternatives at a similar price
In-stock 4K projectors priced closest to it on Amazon today.
| Model | Price today | Amazon rating | Compare |
|---|---|---|---|
| Optoma UHD35STx (this one) | $1,299 | 3.2★ | — |
| BenQ TK700 4K HDR Gaming Projector | $1,299 | 4.0★ | — |
| BenQ TK800M 4K UHD Home Theater Projector with HDR and HLG | $1,276 | 4.5★ | — |
| ViewSonic LX700-4K UHD 3500 Lumens Laser Projector Designed | $1,239 | 4.0★ | — |
| XGIMI HORIZON Ultra 4K Projector | $1,388 | 4.3★ | — |
Where it fits
Optoma UHD35STx FAQ
- How far from the screen should the Optoma UHD35STx be for a 100-inch image?
- About 3' 8" from lens to screen. It has a fixed 0.5:1 lens, so each screen size has one distance.
- What is the input lag of the Optoma UHD35STx?
- 1080p / 240 Hz (Enhanced Gaming Mode): 4.2 ms; 4K / 60 Hz: 16.9 ms. Source: Optoma’s published rating and ProjectorCentral’s listing (Optoma’s spec table rounds the first figure to 4 ms); we found no independent measurement.
- Does the Optoma UHD35STx have lens shift?
- No. It has a fixed 116% offset and a fixed lens with no optical zoom, so the image position and size are set by where the projector sits.
Sources
- Optoma UHD35STx product page
- ProjectorCentral: Optoma UHD35STx
- Optoma UHD35STx launch announcement (PR Newswire)
Price, stock and rating come from Amazon and update automatically (last checked Nov 14, 2026, 8:00 PM).
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