Comparison
UHZ35ST vs ZK431ST-B
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A side-by-side look at how the Optoma UHZ35ST and Optoma ZK431ST-B compare on specs, accuracy, room requirements, and price. No hype — just the parts of the decision a buyer actually weighs.
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Prices confirmed Nov 10, 2026 · we check every retailer daily
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Prices confirmed Nov 10, 2026 · we check every retailer daily
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Full specificationsEvery spec for both, line by line
Specifications
The numbers, lined up.
Image
| Spec | UHZ35ST | ZK431ST-B |
|---|---|---|
| Resolution | True 4K (3840×2160) | 4K UHD (3840×2160); Optoma calls it True 4K UHD and names no chip |
| Lumens | 3,500 (standard not stated) | 4,100 (ISO 21118) |
| HDR | HDR10, HLG | — |
| Picture Mode | Golf Sim preset | Golf Sim colour mode (preset) |
| Screen Size | — | 36–300 in (Optoma's spec table says 30–300, its feature list 36–300; the narrower range is used) |
- ResolutionUHZ35STTrue 4K (3840×2160)ZK431ST-B4K UHD (3840×2160); Optoma calls it True 4K UHD and names no chip
- LumensUHZ35ST3,500 (standard not stated)ZK431ST-B4,100 (ISO 21118)
- HDRUHZ35STHDR10, HLGZK431ST-B—
- Picture ModeUHZ35STGolf Sim presetZK431ST-BGolf Sim colour mode (preset)
- Screen SizeUHZ35ST—ZK431ST-B36–300 in (Optoma's spec table says 30–300, its feature list 36–300; the narrower range is used)
Hardware
| Spec | UHZ35ST | ZK431ST-B |
|---|---|---|
| Light Source | Laser (30,000 hours) | DuraCore laser (30,000 hours, eco) |
| Throw Ratio | 0.496:1 (fixed) | 0.496:1 (short throw, fixed) |
| Fan Noise | 28–35 dB (Optoma spec) | — |
| Lens | — | Fixed 0.496:1 short-throw lens (no zoom, no lens shift) |
| Keystone | — | ±15° with Smart Fit auto-alignment |
- Light SourceUHZ35STLaser (30,000 hours)ZK431ST-BDuraCore laser (30,000 hours, eco)
- Throw RatioUHZ35ST0.496:1 (fixed)ZK431ST-B0.496:1 (short throw, fixed)
- Fan NoiseUHZ35ST28–35 dB (Optoma spec)ZK431ST-B—
- LensUHZ35ST—ZK431ST-BFixed 0.496:1 short-throw lens (no zoom, no lens shift)
- KeystoneUHZ35ST—ZK431ST-B±15° with Smart Fit auto-alignment
Performance
| Spec | UHZ35ST | ZK431ST-B |
|---|---|---|
| Input Lag | 17 ms at 4K/60; 4.4 ms at 1080p/240Hz (Optoma's spec table says 16 ms at 4K/60, its feature list and datasheet 17 ms; the higher is used) | 16.8 ms at 4K/60Hz and 8.6 ms at 1080p/120Hz with Enhanced Gaming on (Optoma's page says 16.7 ms at 4K/60; the manual's 16.8 is used); 33.5 ms at 4K/60 with it off. Keystone and four-corner correction are disabled in low-latency mode |
- Input LagUHZ35ST17 ms at 4K/60; 4.4 ms at 1080p/240Hz (Optoma's spec table says 16 ms at 4K/60, its feature list and datasheet 17 ms; the higher is used)ZK431ST-B16.8 ms at 4K/60Hz and 8.6 ms at 1080p/120Hz with Enhanced Gaming on (Optoma's page says 16.7 ms at 4K/60; the manual's 16.8 is used); 33.5 ms at 4K/60 with it off. Keystone and four-corner correction are disabled in low-latency mode
Room planner
See each one in your sim room.
The planner draws each unit to scale with your room and your swing: where it mounts, the throw it needs, and whether your shadow crosses the light. Put in your room once, then switch units in the planner to compare.
Persona fitWho each one is better for
Who each one is better for
Both fit the same buyers.
Neither one wins a persona the other doesn’t. The choice comes down to specs, price, and room fit rather than buyer profile.
Both fit
- Performance Seeker
- Family Setup
- Space-Constrained
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