Optoma ZK431ST-B 4K Laser Short Throw 4100-LM Golf Sim Projector
By Optoma
Will This Projector Fit My Space?
4K UHD · Laser · Ultra-Short Throw
Compact 4K. Tight Rooms. No Compromises.
The Optoma ZK431ST-B is the entry tier of Optoma’s dedicated golf sim lineup. A 0.496:1 ultra-short throw lens lets the projector mount close to the screen — ideal for compact rooms with low ceilings or short hitting bays. True 4K UHD and 4,100 ANSI lumens deliver sharp course detail and clean tracer overlays without the bulk of a commercial-grade chassis.
4K
UHD Resolution
3840 × 2160 native
4,100
ANSI Lumens
Real-room brightness
0.496:1
Throw Ratio
Fixed ultra-short throw
30K
Hour Laser
DuraCore, Eco mode
Why The ZK431ST-B
Built For Small Rooms And Quick Setups
The ZK431ST-B is the compact answer in Optoma’s golf sim trio. Smaller chassis, tighter throw, simpler install — without giving up 4K, laser life, or Golf Sim Mode color tuning.
4,100 Lumens
Bright enough for residential sim rooms with ambient light — holds course detail and shot data clean without requiring a fully dark room.
True 4K UHD
3840 × 2160 native resolution renders sharp fairways, readable simulator overlays, and detailed course textures at any screen size up to 300″.
0.496:1 Ultra-Short Throw
The tightest throw ratio in the Optoma golf lineup. Mount close to the screen, eliminate shadows on the hitter, and reclaim ceiling space.
30,000-Hour Laser
DuraCore laser light source eliminates lamp replacements entirely and holds consistent brightness across the full rated life.
34% Smaller Chassis
Up to 34% smaller than previous Optoma 4K models, making the ZK431ST-B easier to ceiling mount in low-clearance bays and tight enclosures.
24/7 Operation
Rated for continuous 24/7 use even in the compact form factor — a fit for residential bays and small commercial training spaces.
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. One-touch from the remote.
Who Is It Best For?
- Compact residential simulator rooms
- Bays with low ceilings or short hitting distance
- First-time builders watching budget
- Enclosures where chassis size matters
- Builders running GSPro, E6, TGC 2019, or Foresight FSX
- Quick installs that benefit from Smart Fit alignment
Ultra-Short Throw & Setup
The Compact Lens Built For Tight Bays
Placement Flexibility
The 0.496:1 ultra-short throw is the tightest in Optoma’s golf sim trio. Mount close enough to eliminate shadows on the hitter and use the saved space for the launch monitor.
- Projection distance: 1.3 ft to 10.8 ft
- Screen size: 36″ to 300″ diagonal
- Keystone: horizontal ±15°, vertical ±15°
- Four-corner correction
- Native offset 114%
Installer Checklist
Ultra-short throw lenses are unforgiving on alignment. Confirm 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 ZK431ST-B
The Compact Entry To Optoma’s 4K Golf Sim Lineup
The ZK431ST-B is the entry tier of Optoma’s purpose-built 4K golf simulator lineup — smaller, tighter-throw, and value-priced versus the 5,000-lumen ZK521ST-B and 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 0.496:1 ultra-short throw lens.
Placement range: the ZK431ST-B supports a projection distance of 1.3 ft to 10.8 ft and a screen size range of 36″ 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 ZK431ST-B weighs 6.4 lbs and supports 360° and portrait orientation. The compact chassis (10.8″ × 8.5″ × 4.5″) is up to 34% smaller than previous Optoma 4K models — useful for ceiling-mount installs in low-clearance bays. Native offset is 114% with four-corner correction and ±15° keystone in both axes for cleanup.
Simulator software: the ZK431ST-B works with all major sim platforms including GSPro, E6 Connect, TGC 2019, Awesome Golf, and Foresight FSX. The Optoma Smart Control app provides Smart Fit alignment plus display tuning purpose-built for third-party simulation software.
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, 21:9, and 32:9 simulator aspect ratios.
Throw & Projection
0.496:1 fixed ultra-short throw. Projection distance 1.3 ft to 10.8 ft. Screen size 36″ to 300″. Native offset 114%.
Brightness & Contrast
4,100 ANSI lumens with a 300,000:1 dynamic contrast ratio. DuraCore laser delivers consistent brightness across the full 30,000-hour rated life.
Compact Chassis
Up to 34% smaller than previous Optoma 4K models. 6.4 lbs net weight with 360° and portrait projection support for flexible mounting.
Audio & Operation
Built-in 15W speaker. 29 dB operating noise in Eco mode. Rated for 24/7 continuous operation in residential and small commercial sim bays.
Connectivity
1 × HDMI 2.0, 1 × HDMI 2.0 (eARC), 2 × USB-A 1.5A, RJ45 LAN, RS232, 12V trigger, 3D Sync, and audio out. Full installer control support.
Smart Control App
iOS and Android app handles Smart Fit alignment, geometry correction, power, source switching, and image settings — useful for ceiling-mounted projectors.
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 ZK431ST-B |
|---|---|
| Display Technology | Single-chip DLP |
| Native Resolution | 4K UHD, 3840 × 2160 |
| Brightness | 4,100 ANSI lumens |
| Contrast Ratio | 300,000:1 dynamic |
| Light Source | DuraCore laser |
| Laser Life | Up to 30,000 hours (Eco mode) |
| Throw Ratio | 0.496:1 fixed ultra-short throw |
| Projection Distance | 1.3 ft to 10.8 ft |
| Screen Size Range | 36″ to 300″ diagonal |
| Native Aspect Ratio | 16:9 |
| Supported Aspect Ratios | 4:3, 16:9, 16:10, 21:9, 32:9 |
| HDR Support | HDR10, HLG |
| Native Offset | 114% |
| Keystone Correction | Horizontal ±15°, Vertical ±15° |
| Geometric Correction | Four-corner correction |
| Picture Modes | Includes dedicated Golf Sim Mode |
| Alignment | Optoma Smart Fit via Smart Control app (iOS/Android) |
| Operating Noise | 29 dB (Eco mode), 35 dB (Bright) |
| Built-In Speaker | 1 × 15W |
| 24/7 Operation | Supported |
| Orientation | 360° and portrait projection |
| HDMI Inputs | 1 × HDMI 2.0, 1 × HDMI 2.0 (eARC) |
| USB | 2 × USB-A 1.5A |
| Control | RJ45 LAN, RS232, 12V trigger, 3D Sync |
| Dimensions | 10.8″ × 8.5″ × 4.5″ |
| Net Weight | 6.4 lbs |
| Power Supply | 100–240V, 50–60Hz |
| 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, plus the dedicated Golf Sim picture mode. The differences are brightness, throw geometry, and how much room they can light up.
Optoma ZK431ST-B
Compact 4K ultra-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
- 34% smaller form factor
- Smart Fit + Golf Sim Mode
- 24/7 operation supported
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
- Vertical lens shift 104% to 125%
- 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
- Golf Sim Mode (no Smart Fit)
Best For: Commercial Bays, Largest Screens
Build The Complete Bay
Pair The ZK431ST-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.
