Key Features
5,000 lumens of usable brightness
Holds a punchy image in a lit bay, not just a blacked-out room.
0.79:1 short throw
A 100" image from about 5.5 ft, so the projector clears the golfer and casts far less shadow.
True 4K UHD
8.3 million pixels — fairway contour, ball flight and data overlays stay readable.
8.4 ms input lag at 120Hz
Shot feedback lands the moment you swing.
Smart Fit auto-alignment
Squares the image to your impact screen without manual keystone fiddling.
30,000-hour DuraCore laser
No lamp to replace, rated for 24/7 commercial use.
Technical Specifications
| Resolution | 4K UHD (3840 × 2160) |
| Brightness | 5,000 lumens |
| Light Source | DuraCore Laser (30,000 hrs) |
| Throw Ratio | 0.79:1 |
| Type | Short-Throw |
| Contrast Ratio | 300,000:1 |
| Projection Distance | 2.9 ft – 9.6 ft |
| Screen Size | 30" – 300" |
| Input Lag | 8.4 ms at 1080p/120Hz |
| Noise Level | 29 dB |
| Lens Shift | Vertical 104%–125% |
| Connectivity | 2 × HDMI 2.0, RJ-45, RS232, USB-A |
| Speaker | 1 × 15W |
| Dimensions | 10.8" × 8.5" × 4.5" |
| Weight | 6.6 lbs (net) |
| 24/7 Operation | Yes |
| Technology | DLP Laser |
| Brand | Optoma |
Will It Fit Your Room?
The Optoma ZK521ST-B has a 0.79:1 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?
5,000 lumens holds contrast better than the 4,100 lumen ZK431ST-B when you cannot fully black out the space.
Great fitA 0.79:1 throw fills a 100 inch image from roughly 5.5 ft. Comfortable in most dedicated rooms, and brighter for the extra distance.
Great fitIf you cannot give it about 5.5 ft to a 100 inch screen, the ZK431ST-B at 0.496:1 gets the same image from closer in.
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 →