Optoma ZK521ST-B 4K Laser Short Throw 5000-LM Golf Sim Projector
By Optoma
4K UHD · Laser · Short Throw
Bright Enough For Any Sim Bay, Sharp Enough For Every Shot
The Optoma ZK521ST-B is a 5,000-lumen 4K UHD short-throw laser projector built for golf simulators that need to push light through a screen even when the room lights are on. True 4K resolution keeps fairway texture, ball flight, and on-screen data crisp. A 0.79:1 throw ratio handles tight ceilings and short hitting distances without compromising image size.
4K
UHD Resolution
3840 × 2160 native
5,000
ANSI Lumens
Lights-on brightness
0.79:1
Throw Ratio
Fixed short throw
30K
Hour Laser
DuraCore, Eco mode
Why The ZK521ST-B
Built For Bright Rooms And Long Hours
Brightness, color, and rated life are the three numbers that separate a simulator projector from a living-room model. The ZK521ST-B is engineered around all three, with 24/7 operation support and a sealed laser engine designed for commercial-grade reliability.
5,000 Lumens
High output keeps the image vivid in bays with bright LED lighting, large windows, or open commercial space — no need to black out the room.
True 4K UHD
3840 × 2160 native resolution holds course textures, simulator overlays, and tracer data sharp at screen sizes up to 300″.
0.79:1 Short Throw
A fixed short-throw lens fills a 10ft wide screen from about 8 feet away, cutting shadows on the hitter and freeing up ceiling space.
30,000-Hour Laser
DuraCore laser light source is rated up to 30,000 hours in Eco mode — over a decade of normal residential use with no lamp swaps.
8.4ms Input Lag
Input lag drops to 8.4ms at 1080p/120Hz and 16.7ms at 4K/60Hz, keeping ball-strike response tight in fast simulator software.
24/7 Operation
Rated for continuous 24/7 use, making the ZK521ST-B a fit for commercial sim bays, training studios, and entertainment venues.
Optoma Smart Fit
Smart Fit alignment in the Optoma Smart Control app uses a phone photo of the screen to auto-calculate geometry and four-corner correction — no ladder, no remote-button keystone hunt.
Dedicated Golf Sim Mode
Optoma's Golf Sim Mode tunes color, contrast, and response for simulator gameplay — brighter blue skies, deeper shadows, natural greens, and faster on-screen response. One-touch from the remote.
Who Is It Best For?
- Premium residential simulator rooms with ambient light
- Commercial bays running long daily sessions
- Tight ceilings needing a short-throw fixed lens
- Bays already running 4K launch monitor software
- Builders prioritizing rated laser life over zoom range
- Installations where 24/7 reliability matters
Short Throw & Setup
Engineered For The Way Sim Rooms Are Actually Built
Placement Flexibility
The 0.79:1 fixed throw works in the sweet spot for most residential and commercial sim rooms — close enough to reduce shadows, far enough back to clear the hitter and tracking hardware.
- Projection distance: 2.9 ft to 9.6 ft
- Screen size: 30″ to 300″ diagonal
- Vertical lens shift: 104% to 125%
- Keystone: horizontal ±15°, vertical ±15°
- Auto Fit Screen and four-corner correction
Installer Checklist
Short-throw projectors are unforgiving on mount placement. Confirm the geometry before drilling anything.
- Confirm screen width and final aspect ratio
- Verify ceiling height and enclosure depth
- Use the ESG fitment tool for exact mounting distance
- Plan HDMI and power runs to the mount
- Test image placement before permanent mounting
What Is The ZK521ST-B
The 5,000-Lumen Anchor In Optoma's Golf Sim Lineup
The ZK521ST-B is the middle tier of Optoma's purpose-built 4K golf simulator lineup — brighter and more flexible than the entry-level ZK431ST-B, more compact and value-priced than the 6,000-lumen ZK608TST. It uses a single-chip DLP engine with a true 4K UHD pixel array, a sealed DuraCore laser light source rated up to 30,000 hours in Eco mode, and a fixed 0.79:1 short-throw lens.
Placement range: the ZK521ST-B supports a projection distance of 2.9 ft to 9.6 ft and a screen size range of 30″ to 300″ diagonal. For the exact lens-to-screen distance based on your screen size and aspect ratio, run the numbers in the ESG projector fitment tool and throw calculator before mounting.
Ceiling mount notes: the ZK521ST-B weighs 6.6 lbs and supports 360° orientation. Vertical lens shift of 104% to 125% provides above-image projection without keystone correction, keeping image geometry clean.
Simulator software: the ZK521ST-B works with all major sim platforms including GSPro, E6 Connect, TGC 2019, Awesome Golf, and Foresight FSX. 4K/60Hz at 16.7ms input lag is suitable for ball-strike response in launch-monitor-driven gameplay.
Everything It Does
Spec-By-Spec Breakdown
Resolution & Color
4K UHD 3840 × 2160 with HDR10 and HLG support. Native 16:9 with full support for 4:3, 16:10, and 21:9 simulator aspect ratios.
Throw & Projection
0.79:1 fixed short throw. Projection distance 2.9 ft to 9.6 ft. Screen size 30″ to 300″. Vertical lens shift 104% to 125%.
Brightness & Contrast
5,000 ANSI lumens with a 300,000:1 dynamic contrast ratio. DuraCore laser delivers consistent brightness across the full 30,000-hour rated life.
Input Lag & Refresh
Input lag of 16.7ms at 4K/60Hz and 8.4ms at 1080p/120Hz. Vertical scan rate up to 120Hz. Built for responsive simulator gameplay.
Audio & Operation
Built-in 15W speaker. 29 dB operating noise in Eco mode. Rated for 24/7 continuous operation in residential and commercial sim bays.
Connectivity
2 × HDMI 2.0, 2 × USB-A 2.0, RJ45 LAN, RS232, 12V trigger, 3D Sync Out, and audio in/out. Full integration with installer control systems.
Smart Control App
iOS and Android app handles Smart Fit alignment, geometry correction, power, source switching, and image settings — useful for ceiling-mounted projectors that are tough to reach.
Golf Sim Mode
Purpose-built picture mode tuned for indoor golf. Compatible with GSPro, E6 Connect, TGC 2019, Awesome Golf, and Foresight FSX without manual color tweaking.
By The Numbers
Full Specifications
| Model | Optoma ZK521ST-B |
|---|---|
| Display Technology | Single-chip DLP |
| Native Resolution | 4K UHD, 3840 × 2160 |
| Brightness | 5,000 ANSI lumens |
| Contrast Ratio | 300,000:1 dynamic |
| Light Source | DuraCore laser |
| Laser Life | Up to 30,000 hours (Eco mode) |
| Throw Ratio | 0.79:1 fixed |
| Projection Distance | 2.9 ft to 9.6 ft |
| Screen Size Range | 30″ to 300″ diagonal |
| Native Aspect Ratio | 16:9 |
| Supported Aspect Ratios | 4:3, 16:9, 16:10, Full, Auto, Native |
| Input Lag | 16.7ms at 4K/60Hz · 8.4ms at 1080p/120Hz |
| HDR Support | HDR10, HLG |
| Vertical Lens Shift | 104% to 125% |
| Keystone Correction | Horizontal ±15°, Vertical ±15° |
| Operating Noise | 29 dB (Eco mode) |
| Picture Modes | Includes dedicated Golf Sim Mode |
| Alignment | Optoma Smart Fit via Smart Control app (iOS/Android) |
| Built-In Speaker | 1 × 15W |
| 24/7 Operation | Supported |
| HDMI Inputs | 2 × HDMI 2.0 |
| Control | RJ45 LAN, RS232, 12V trigger |
| USB | 2 × USB-A 2.0 |
| Dimensions | 10.8″ × 8.5″ × 4.3″ (without feet) |
| Net Weight | 6.6 lbs |
| Power Supply | 100–240V, 50–60Hz |
| Warranty | 3 years projector, 3 years or 30,000 hours laser |
| Dealer Status | Elite Sim Golf is an authorized Optoma dealer |
Compare The Lineup
Good, Better, Best — Optoma 4K Golf Sim Projectors
All three Optoma golf-sim projectors deliver true 4K UHD on a sealed DuraCore laser engine rated up to 30,000 hours. The differences are brightness, throw geometry, and how much room they can light up. Pick by screen size, ambient light, and budget.
Optoma ZK431ST-B
Compact 4K short throw for tight rooms
- 4K UHD 3840 × 2160
- 4,100 ANSI lumens
- 0.496:1 fixed ultra-short throw
- 30,000-hour DuraCore laser
- Projection range 1.3 ft to 10.8 ft
- Four-corner correction
- 34% smaller form factor
- Entry tier for residential bays
Best For: Compact Rooms, Lower Ceilings
Optoma ZK521ST-B
5,000-lumen short throw, 24/7 rated
- 4K UHD 3840 × 2160
- 5,000 ANSI lumens
- 0.79:1 fixed short throw
- 30,000-hour DuraCore laser
- Projection range 2.9 ft to 9.6 ft
- 8.4ms input lag at 1080p/120Hz
- 24/7 operation supported
- HDR10, HLG, 15W speaker
- Smart Fit + Golf Sim Mode
Best For: Bright Rooms, Premium Builds
Optoma ZK608TST
6,000-lumen pro short throw, IP6X engine
- 4K UHD 3840 × 2160
- 6,000 ANSI lumens
- 0.58:1 fixed short throw
- 30,000-hour DuraCore laser
- Projection range 1.2 ft to 12.3 ft
- IP6X dust-sealed optical engine
- Manual H/V lens shift, HDBaseT
- Built-in 15W speaker
Best For: Commercial Bays, Largest Screens
Build The Complete Bay
Pair The ZK521ST-B With The Rest Of The Build
A projector is one piece of the simulator. Elite Sim Golf builds the full bay — enclosure, screen, hitting surface, launch monitor, PC, and projector — sized and shipped together so the geometry works the first time.
Pair It With An ESG Enclosure
The Eagle 12 enclosure is sized for short-throw 4K projectors with proper sidewall clearance and an impact-rated screen surface. Frame, screen, and side curtains ship together.
Build A Complete SimKit
Pre-built SimKit bundles include the projector, enclosure, hitting surface, launch monitor, and PC matched to your room size and budget. Or use the Bundle Builder to spec a custom kit.