Comparison
TH671ST vs ZW351ST-B
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A side-by-side look at how the BenQ TH671ST and Optoma ZW351ST-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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Buy TH671ST
Prices confirmed Nov 10, 2026 · we check every retailer daily
Buy ZW351ST-B
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 | TH671ST | ZW351ST-B |
|---|---|---|
| Resolution | 1080p (1920×1080) | WXGA (1280×800), 16:10 |
| Lumens | 3,000 ANSI | 3,600 (ISO 21118) |
| Picture Mode | — | Golf Sim Mode |
- ResolutionTH671ST1080p (1920×1080)ZW351ST-BWXGA (1280×800), 16:10
- LumensTH671ST3,000 ANSIZW351ST-B3,600 (ISO 21118)
- Picture ModeTH671ST—ZW351ST-BGolf Sim Mode
Hardware
| Spec | TH671ST | ZW351ST-B |
|---|---|---|
| Light Source | Lamp, 240 W (4,000 h normal, 10,000 h eco/SmartEco, 15,000 h LampSave) | DuraCore laser (30,000 hours, eco) |
| Throw Ratio | 0.69–0.83 (1.2× optical zoom) | 0.521:1 (fixed; Optoma's datasheet rounds it to 0.52) |
| Offset | 102.5%; no lens shift | 112% (±5%); no lens shift |
| Dimensions | 11.65 × 8.82 × 4.72 in (W × D × H) | 10.8 × 8.5 × 4.5 in (W × D × H), 6.25 lb |
| Keystone | — | ±15° horizontal and vertical, four-corner, Smart Fit through Optoma's phone app |
| Dust Sealing | — | IP6X optical engine (Optoma) |
- Light SourceTH671STLamp, 240 W (4,000 h normal, 10,000 h eco/SmartEco, 15,000 h LampSave)ZW351ST-BDuraCore laser (30,000 hours, eco)
- Throw RatioTH671ST0.69–0.83 (1.2× optical zoom)ZW351ST-B0.521:1 (fixed; Optoma's datasheet rounds it to 0.52)
- OffsetTH671ST102.5%; no lens shiftZW351ST-B112% (±5%); no lens shift
- DimensionsTH671ST11.65 × 8.82 × 4.72 in (W × D × H)ZW351ST-B10.8 × 8.5 × 4.5 in (W × D × H), 6.25 lb
- KeystoneTH671ST—ZW351ST-B±15° horizontal and vertical, four-corner, Smart Fit through Optoma's phone app
- Dust SealingTH671ST—ZW351ST-BIP6X optical engine (Optoma)
Requirements
| Spec | TH671ST | ZW351ST-B |
|---|---|---|
| Throw Distance | 100 in at about 5.0–6.0 ft (BenQ's manual) | 100 in (16:10) at about 3.7 ft (Optoma's manual) |
- Throw DistanceTH671ST100 in at about 5.0–6.0 ft (BenQ's manual)ZW351ST-B100 in (16:10) at about 3.7 ft (Optoma's manual)
Performance
| Spec | TH671ST | ZW351ST-B |
|---|---|---|
| Input Lag | — | 8.4 ms at 1080p/120Hz (Optoma's product page; the datasheet gives none, and the manual lists its low-latency mode for the 1080p model only) |
- Input LagTH671ST—ZW351ST-B8.4 ms at 1080p/120Hz (Optoma's product page; the datasheet gives none, and the manual lists its low-latency mode for the 1080p model only)
Support
| Spec | TH671ST | ZW351ST-B |
|---|---|---|
| Warranty | — | 1 year parts and labor; light source 5 years or 12,000 hours (Optoma's datasheet) |
- WarrantyTH671ST—ZW351ST-B1 year parts and labor; light source 5 years or 12,000 hours (Optoma's datasheet)
Room planner
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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.
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