Key Features
0.496:1 short throw
A 100" image from roughly 3.6 ft — the shortest throw in this brightness class.
4,100 lumens
Bright enough for a lit residential or light-commercial bay.
True 4K UHD
Crisp course detail and simulator overlays at 3840 × 2160.
360° and portrait projection
Mount it at any angle the room demands.
Compact chassis
Up to 34% smaller than a regular laser projector at 10.8" × 8.5" × 4.5".
30,000-hour DuraCore laser
HDR and HLG compatible, rated for 24/7 operation.
Technical Specifications
| Resolution | 4K UHD (3840 × 2160) |
| Brightness | 4,100 lumens |
| Light Source | DuraCore Laser (30,000 hrs) |
| Throw Ratio | 0.496:1 |
| Type | Short-Throw |
| Contrast Ratio | 300,000:1 |
| Projection Distance | 1.3 ft – 10.8 ft |
| Screen Size | 30" – 300" |
| Input Lag | 8.4 ms at 1080p/120Hz |
| Noise Level | 29–35 dB |
| Projection Modes | 360° and portrait |
| Connectivity | 2 × HDMI 2.0, RJ-45, RS232, USB-A |
| Speaker | 1 × 15W |
| Dimensions | 10.8" × 8.5" × 4.5" |
| Weight | 9.5 lbs (gross) |
| 24/7 Operation | Yes |
| Technology | DLP Laser |
| Brand | Optoma |
Will It Fit Your Room?
The Optoma ZK431ST-B has a 0.50:1 throw ratio. Enter your throw distance and screen width to check the fit.
Throw distance is measured from the lens to the impact screen, not from the back wall.
In The Box
- Projector unit
- AC power cord
- Remote control
- Basic user manual
HDMI cable not included — most installs use the cable already run to the sim PC.
Is This Right For You?
A 0.496:1 throw puts a 100 inch image up from roughly 4.1 ft. If your room will not give you much distance behind the hitting area, this is the one that still fills the screen.
Great fitTrue 4K UHD with a 30,000-hour laser at well under two thousand dollars. A straight upgrade from a 1080p lamp projector without moving to commercial pricing.
Great fit4,100 lumens is sized for a controlled room. If you cannot dim the space, or you are fitting a commercial bay, step up to the ZK521ST-B or a large-venue unit.
Worth knowingWhat You'll Also Need
A projector needs a fixed mount to hold alignment. Short-throw units sit close to the screen, so a solid mount matters more than on a long-throw setup.
Browse ceiling mount →The screen is what you actually see. Screen grade affects brightness and how much of the projector's output reaches your eye.
Browse impact screen →Every simulator platform runs on a Windows PC. The projector connects over HDMI; the PC does the work.
Browse simulator pc →