Optoma 4K UHD Short Throw Lineup · 2026 Buyer’s Guide
Optoma 4K Short Throw Golf Simulator Projectors: ZK431ST-B vs ZK521ST-B vs ZK608TST
Three native 4K UHD laser short-throw projectors built for the most demanding sim builds. All three share native 3840 × 2160 resolution, HDR10 plus HLG, dedicated Golf Sim picture mode, DuraCore laser life up to 30,000 hours, and 24/7 operation. The differences come down to brightness, throw geometry, lens shift, ProAV connectivity, and chassis grade. For 1080p builds, see the Optoma 1080p short throw lineup.
4K
Native UHD
3840 × 2160, all three
HDR10
+ HLG Support
High dynamic range
Golf
Sim Mode
Dedicated picture preset
30K
Hour Laser
DuraCore, 24/7 rated
What Is Shared
The Common Platform Underneath All Three
Before the differences, here is what does not change across the lineup. Every projector in the Optoma 4K short-throw family is native 4K UHD with HDR10 and HLG, runs the same DuraCore laser engine, includes a dedicated Golf Sim picture mode, and is rated for 24/7 operation. Installer geometry, color tuning, and long-term reliability work the same way regardless of which tier ends up on the ceiling.
Native 4K UHD Resolution
True 3840 × 2160 native resolution across all three. Course visuals, ball flight overlays, GSPro UI, and pin-position detail render at native pixel for pixel resolution — no scaling artifacts from a 1080p panel.
HDR10 + HLG
All three accept HDR10 and HLG sources over HDMI 2.0. Course environments with bright sky and shadowed fairway hold detail in both highlights and shadows — not crushed like SDR.
Dedicated Golf Sim Picture Mode
All three include a dedicated Golf Sim picture preset tuned by Optoma for course color, grass tone, and shot-overlay readability. One-click selection from the remote — no manual calibration required.
30,000-Hour DuraCore Laser
Sealed DuraCore laser light source rated up to 30,000 hours. No lamp replacements ever. Brightness stays consistent across the full rated life. At four hours of daily use, that is over 20 years of residential sim life.
24/7 Operation Rated
All three are rated for continuous 24/7 operation. A fit for residential sim bays, training rooms, demo loops, and commercial spaces that need full-day uptime.
HDMI 2.0 + RJ45 Control
Each model includes HDMI 2.0 inputs, RJ45 LAN, RS232 serial, and a 12V trigger. Integrate with Crestron, Extron, and home-automation systems — or just drive the projector from a 4K-output simulator PC.
Pick Your Tier
Good, Better, Best — Side By Side
Each tier targets a different 4K sim-build profile. The Good tier is the ultra-short-throw entry into native 4K. The Better tier is the standard-throw 4K sweet spot with vertical lens shift. The Best tier is a ProAV-grade chassis with the brightest output, full lens shift, HDBaseT, and an IP6X-sealed engine.
Optoma ZK431ST-B
4K UHD ultra-short throw, compact entry
4K UHD
Native Resolution
4,100
ANSI Lumens
0.496:1
Ultra Short Throw
6.4 lb
Compact Chassis
- 3,840 × 2160 native 4K UHD
- Ultra-short throw, 1.3 to 10.8 ft
- HDR10 + HLG, Golf Sim Mode
- Smart Fit app alignment
- 2 × HDMI 2.0 (1 eARC), RJ45
- 360° + portrait orientation
Best For: Entry 4K, Low-Ceiling Bays
Optoma ZK521ST-B
4K UHD short throw with lens shift, the 4K sweet spot
4K UHD
Native Resolution
5,000
ANSI Lumens
0.79:1
Short Throw
8.4 ms
Input Lag (1080p/120)
- 3,840 × 2160 native 4K UHD
- 5,000 lm, 0.79:1 short throw
- Vertical lens shift 104–125%
- 16.7 ms at 4K/60, 8.4 ms at 1080p/120
- HDR10 + HLG, Golf Sim Mode
- Smart Fit app, 3-yr / 30K-hr warranty
Best For: Standard 4K Sim Builds
Optoma ZK608TST
6,000-lumen ProAV 4K with full lens shift + HDBaseT
4K UHD
Native Resolution
6,000
ANSI Lumens
0.58:1
Short Throw
IP6X
Sealed Engine
- 3,840 × 2160 native 4K UHD
- 6,000 lm, brightest in the lineup
- Vertical -106 to 116%, horizontal ±4%
- HDBaseT 3.0 + 2 × HDMI 2.0 + HDMI Out
- IP6X sealed engine, ProAV grade
- Golf Sim Mode, backlit ProAV remote
Best For: Commercial, Ambient Light, Largest Screens
Decision Logic
Which Optoma 4K Is Right For Your Bay?
Three filters — throw geometry, room conditions, and integration needs — line up with the three tiers. Pick the profile that matches your build.
Pick The ZK431ST-B If…
The bay is short, ceilings are low, and the build needs the tightest 4K throw with a compact, light chassis.
- Ultra-short throw is required (0.496:1)
- Compact residential bay, low ceiling
- Need 4K UHD without ProAV connectivity
- Smart Fit app alignment is enough
- 360° + portrait orientation needed
Pick The ZK521ST-B If…
Standard residential bay with native 4K and vertical lens shift — the most common 4K sim build profile.
- Standard residential bay (12′–16′ wide)
- Need vertical lens shift for mount tuning
- 5,000 lumens fits the room and screen
- 8.4 ms input lag at 1080p/120 matters
- 3-year / 30K-hour laser warranty
Pick The ZK608TST If…
The build is large, the room has ambient light, or the install needs ProAV-grade connectivity and full lens shift.
- Large screen (14′ to 20′+ wide)
- Ambient light, large windows, commercial bay
- Need HDBaseT or HDMI out
- Full vertical + horizontal lens shift required
- IP6X dust seal critical for environment
Spec Comparison
Full Side-By-Side Specifications
Every spec the three projectors differ on, lined up in a single table. Anything not listed here is shared across the lineup — native 4K UHD 3840 × 2160, HDR10 + HLG, dedicated Golf Sim picture mode, DuraCore laser up to 30,000 hours, 15W speaker, RJ45 LAN, RS232, 12V trigger, ±15° keystone, 24/7 operation.
| Specification | ZK431ST-B — Good | ZK521ST-B — Better | ZK608TST — Best |
|---|---|---|---|
| Brightness | 4,100 ANSI lumens | 5,000 ANSI lumens | 6,000 ANSI lumens |
| Throw Ratio | 0.496:1 ultra short throw | 0.79:1 short throw | 0.58:1 short throw |
| Projection Distance | 1.3 ft to 10.8 ft | 2.9 ft to 9.6 ft | ~1.2 ft to 12.3 ft |
| Screen Size Range | 36″ to 300″ | 30″ to 300″ | 30″ to 300″ |
| Lens Shift | None (offset 114%) | Vertical 104–125% | Vertical -106 to 116%, Horizontal ±4% |
| Input Lag | Not specified | 16.7 ms at 4K/60 · 8.4 ms at 1080p/120 | Not specified |
| IP6X Sealed Engine | Not specified | Not specified | Yes |
| Smart Fit App | Yes (iOS / Android) | Yes (iOS / Android) | Not listed |
| HDMI Inputs | 2 × HDMI 2.0 (1 eARC) | 2 × HDMI 2.0 | 2 × HDMI 2.0 + HDMI 2.0 Out |
| HDBaseT | No | No | HDBaseT 3.0 (4K) |
| Other Inputs | 2 × USB-A 1.5A | 2 × USB-A 2.0 | 2 × VGA, 2 × Audio In, Audio Out, USB-A |
| Operating Noise | 29 dB (Eco) / 35 dB (Bright) | 29 dB (Eco) | 33 dB minimum / 36 dB maximum |
| Orientation | 360° + portrait | 360° | 360° |
| Dimensions | 10.8″ × 8.5″ × 4.5″ | 10.8″ × 8.5″ × 4.3″ | 14.72″ × 11.89″ × 4.61″ |
| Net Weight | 6.4 lbs | 6.6 lbs | 13.89 lbs |
| Chassis Grade | Compact | Compact | ProAV, 50% post-consumer recycled plastics |
| Warranty (light source) | Per Optoma standard | 3 years projector, 3 years or 30,000 hours laser | Per Optoma standard |
| Best For | Entry 4K, low-ceiling bays | Standard 4K sim builds | Commercial, ambient light, largest screens |
Frequently Asked
Common Questions Across The 4K Lineup
Are all three Optoma 4K short-throw projectors true native 4K?
Yes. The ZK431ST-B, ZK521ST-B, and ZK608TST are all native 4K UHD at 3,840 × 2160. None of them are 1080p upscaled or pixel-shifted from a sub-4K panel marketed as 4K. Course visuals, ball flight overlays, and pin-position detail render at native pixel for pixel resolution on all three.
Which Optoma 4K is the most popular for golf simulators?
The ZK521ST-B is the standard-bay sweet spot. At 5,000 ANSI lumens it covers most residential screen sizes with light to ambient room conditions, vertical lens shift makes mounting alignment forgiving, and the published 16.7 ms input lag at 4K/60 (and 8.4 ms at 1080p/120) is the lowest documented in the lineup. The ZK431ST-B is a better fit for compact bays needing ultra-short throw, and the ZK608TST is the pick for large screens, commercial environments, and ProAV integrations.
Do all three include a Golf Sim picture mode?
Yes. All three include a dedicated Golf Sim picture preset tuned by Optoma for course color, grass tone, and shot-overlay readability. The preset is selected from the on-projector menu or remote — no manual calibration required to get a sim-appropriate image on day one.
How far back do these 4K projectors need to be mounted?
All three are fixed-lens short-throw projectors with no optical zoom — lens-to-screen distance is exact, not a range. The ZK431ST-B has a 0.496:1 ultra-short throw, projecting 1.3 to 10.8 ft. The ZK521ST-B has a 0.79:1 throw, projecting 2.9 to 9.6 ft. The ZK608TST has a 0.58:1 throw, projecting roughly 1.2 to 12.3 ft. Run the exact mounting distance for your screen size and aspect ratio in the ESG projector fitment tool and throw calculator before drilling.
Which of these projectors has lens shift?
The ZK521ST-B has vertical-only lens shift from 104% to 125%. The ZK608TST has both vertical lens shift (-106% to 116%) and horizontal lens shift (±4%) plus four-corner geometric correction — the most install-flexible projector in the lineup. The ZK431ST-B has no optical lens shift and relies on its fixed 114% offset plus ±15° keystone for image placement.
What is HDBaseT and which model has it?
HDBaseT is a long-distance signal-transmission standard that carries 4K video, audio, network, and control over a single Cat6/Cat6a cable up to 100 meters — standard in professional AV installations. Only the ZK608TST in this lineup includes HDBaseT (HDBaseT 3.0 with 4K support). For commercial sim bays, training centers, and long-cable-run installs, the HDBaseT input is the deciding feature.
Can all three projectors run 24/7 in a commercial sim bay?
Yes. All three are rated for 24/7 continuous operation. Combined with the DuraCore laser engine and 30,000-hour laser life (the ZK608TST adds an IP6X dust-sealed engine), the entire Optoma 4K short-throw lineup is built for residential bays, training rooms, demo loops, and commercial sim spaces that need full-day uptime.
What simulator software works with these 4K projectors?
All three support major PC-based golf simulator platforms including GSPro, E6 Connect, TGC 2019, Awesome Golf, and Foresight FSX over their HDMI 2.0 inputs at native 4K. Supported aspect ratios include 16:9 native plus 4:3, 16:10, and on the ZK431ST-B also 21:9 and 32:9 for ultrawide displays.
What warranty do these 4K projectors carry through Elite Sim Golf?
Elite Sim Golf is an authorized Optoma dealer, so all three units carry full Optoma manufacturer warranty support. The ZK521ST-B specifically includes a 3-year projector warranty plus 3 years or 30,000 hours of laser coverage (whichever comes first). The ZK431ST-B and ZK608TST carry Optoma’s standard projector and laser-source warranty.
Should I pick 4K or 1080p for a golf simulator?
4K is worth it when the impact screen is 12′ wide or larger and the viewer sits within 12 ft of the screen — pixel structure becomes visible on 1080p at that geometry. For sim screens under 12′ wide in residential rooms, the Optoma 1080p short-throw lineup (GT2000HDR / GT2400HDR) covers most builds at meaningfully lower cost. See the 1080p comparison page for that family.
Not The Right Fit
Looking At Something Different?
4K UHD is the right call for 12′+ screens and close viewing distances. For smaller residential bays, 1080p short throw is the value sweet spot. Want the broader Optoma view across both resolutions? Start at the hub.
Considering 1080p Instead?
Compare the Optoma ZW350ST, GT2000HDR, and GT2400HDR — the short-throw 1080p family built for residential sim bays under 12′ screen width.
See The 1080p Comparison →See The Full Optoma Lineup
All six Optoma short-throw projectors in one place — 4K and 1080p side by side with a quick “Do You Need 4K?” decision guide.
Visit The Optoma Hub →Build The Complete Bay
The Projector Is One Piece. Elite Sim Golf Builds The Rest.
A 4K projector alone does not make a simulator. Elite Sim Golf ships full bays — enclosure, screen, hitting surface, launch monitor, PC, and projector — sized and matched together so the geometry works the first time. Pick a 4K tier above, then pair it with the rest of the build.
Pair It With An ESG Enclosure
The Eagle 12 enclosure is sized for short-throw 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 room size and budget. Or use the Bundle Builder to spec a custom kit.
Confirm Mounting Distance First
All three 4K projectors are fixed-lens short-throw — placement is exact, not a range. Run the numbers before drilling.
Talk To A Sim Builder
Not sure which 4K tier fits your room? Elite Sim Golf builds sim bays full-time and can size the right projector, screen, and enclosure for a specific space in one call.