Comparison
TH671ST vs GT2400HDR
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A side-by-side look at how the BenQ TH671ST and Optoma GT2400HDR compare on specs, accuracy, room requirements, and price. No hype — just the parts of the decision a buyer actually weighs.
Also worth a look
More comparisons with the TH671ST and GT2400HDR
Buy TH671ST
Prices confirmed Nov 10, 2026 · we check every retailer daily
Buy GT2400HDR
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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 | TH671ST | GT2400HDR |
|---|---|---|
| Resolution | 1080p (1920×1080) | 1080p (1920 × 1080) |
| Lumens | 3,000 ANSI | 4,200 (ISO 21118) |
| HDR | — | HDR10 + Hybrid Log Gamma |
| Projection Size | — | 30–300 inches |
- ResolutionTH671ST1080p (1920×1080)GT2400HDR1080p (1920 × 1080)
- LumensTH671ST3,000 ANSIGT2400HDR4,200 (ISO 21118)
- HDRTH671ST—GT2400HDRHDR10 + Hybrid Log Gamma
- Projection SizeTH671ST—GT2400HDR30–300 inches
Hardware
| Spec | TH671ST | GT2400HDR |
|---|---|---|
| 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) | 0.496:1 (100" @ 3.6 ft) |
| Offset | 102.5%; no lens shift | — |
| Dimensions | 11.65 × 8.82 × 4.72 in (W × D × H) | — |
| Inputs | — | HDMI, VGA, 3.5 mm audio |
- Light SourceTH671STLamp, 240 W (4,000 h normal, 10,000 h eco/SmartEco, 15,000 h LampSave)GT2400HDRDuraCore laser (30,000 hours, eco)
- Throw RatioTH671ST0.69–0.83 (1.2× optical zoom)GT2400HDR0.496:1 (100" @ 3.6 ft)
- OffsetTH671ST102.5%; no lens shiftGT2400HDR—
- DimensionsTH671ST11.65 × 8.82 × 4.72 in (W × D × H)GT2400HDR—
- InputsTH671ST—GT2400HDRHDMI, VGA, 3.5 mm audio
Requirements
| Spec | TH671ST | GT2400HDR |
|---|---|---|
| Throw Distance | 100 in at about 5.0–6.0 ft (BenQ's manual) | — |
- Throw DistanceTH671ST100 in at about 5.0–6.0 ft (BenQ's manual)GT2400HDR—
Performance
| Spec | TH671ST | GT2400HDR |
|---|---|---|
| Input Lag | — | 8.6 ms at 1080p/120Hz (Optoma's manual; its page and datasheet say 8.4 ms; the higher is used); 16.7 ms at 1080p/60Hz |
- Input LagTH671ST—GT2400HDR8.6 ms at 1080p/120Hz (Optoma's manual; its page and datasheet say 8.4 ms; the higher is used); 16.7 ms at 1080p/60Hz
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
Honest persona fit, side by side.
Better for GT2400HDR
- Cost-Effective Buyer
Best brightness-per-dollar in the budget tier now that GT2100HDR is being phased out — same 4,200-lumen laser short-throw at $1,299, with current-model retailer availability and warranty.
- Space-Constrained
0.496:1 fixed throw fills a 100" screen from 3.6 ft. Same tight-room geometry as the GT2100HDR with the assurance the model will stay carried by retailers for the next few years.
- Recreational Player
1080p but bright enough for daytime garage play; laser life makes it set-and-forget. The budget Optoma to buy today; the GT2100HDR it replaced is no longer sold new.
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