Comparison
AH700ST vs GT3900UHD
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A side-by-side look at how the BenQ AH700ST and Optoma GT3900UHD compare on specs, accuracy, room requirements, and price. No hype — just the parts of the decision a buyer actually weighs.
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More comparisons with the AH700ST and GT3900UHD
Buy AH700ST
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Prices confirmed Nov 10, 2026 · we check every retailer daily
Buy GT3900UHD
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 | AH700ST | GT3900UHD |
|---|---|---|
| Resolution | 1080p Full HD | 4K UHD (3840×2160) |
| Lumens | 4,000 ANSI | 4,000 (ISO 21118) |
| HDR | HDR10, HLG | HDR10, HLG |
| Color | 95% Rec. 709, Golf Mode | — |
| Picture Mode | — | Golf Mode |
| Screen Size | — | 30–150 in (Optoma's page and datasheet) |
- ResolutionAH700ST1080p Full HDGT3900UHD4K UHD (3840×2160)
- LumensAH700ST4,000 ANSIGT3900UHD4,000 (ISO 21118)
- HDRAH700STHDR10, HLGGT3900UHDHDR10, HLG
- ColorAH700ST95% Rec. 709, Golf ModeGT3900UHD—
- Picture ModeAH700ST—GT3900UHDGolf Mode
- Screen SizeAH700ST—GT3900UHD30–150 in (Optoma's page and datasheet)
Hardware
| Spec | AH700ST | GT3900UHD |
|---|---|---|
| Light Source | Laser, IP5X sealed (20,000 hours) | DuraCore laser (30,000 hours, eco) |
| Throw Ratio | 0.69–0.83 (1.2× motorized zoom) | 0.496:1 (fixed) |
| Offset | — | 114% (±5%); no lens shift |
| Dimensions | — | 10.8 × 8.5 × 4.5 in (W × D × H, datasheet) |
- Light SourceAH700STLaser, IP5X sealed (20,000 hours)GT3900UHDDuraCore laser (30,000 hours, eco)
- Throw RatioAH700ST0.69–0.83 (1.2× motorized zoom)GT3900UHD0.496:1 (fixed)
- OffsetAH700ST—GT3900UHD114% (±5%); no lens shift
- DimensionsAH700ST—GT3900UHD10.8 × 8.5 × 4.5 in (W × D × H, datasheet)
Performance
| Spec | AH700ST | GT3900UHD |
|---|---|---|
| Input Lag | 33.4 ms (1080p/60Hz); 16.7 ms (1080p/120Hz) | As low as 4.3 ms at 1080p/240Hz (Optoma) |
- Input LagAH700ST33.4 ms (1080p/60Hz); 16.7 ms (1080p/120Hz)GT3900UHDAs low as 4.3 ms at 1080p/240Hz (Optoma)
Software
| Spec | AH700ST | GT3900UHD |
|---|---|---|
| Auto Screen Fit | Yes (front camera) | — |
- Auto Screen FitAH700STYes (front camera)GT3900UHD—
Requirements
| Spec | AH700ST | GT3900UHD |
|---|---|---|
| Throw Distance | — | 100 in at about 3.6 ft (Optoma's manual) |
- Throw DistanceAH700ST—GT3900UHD100 in at about 3.6 ft (Optoma's manual)
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 AH700ST
- Cost-Effective Buyer
Golf-dedicated features at $2,299 — best dollar-per-feature for builders who don't have the GPU to push 4K.
- Recreational Player
Set-and-forget polish (Auto Screen Fit, motorized zoom, Golf Mode) without needing a GPU that can drive 4K.
Better for GT3900UHD
- Space-Constrained
0.496 puts a 100-inch image up from about 3.6 ft, so it mounts close to the screen and out of the swing, and it does it in 4K. At $1,499 it is the least expensive 4K projector we list.
- Performance Seeker
4K detail at the tightest throw we list, with published low lag. 4,000 lumens wants some light control; a room with windows is better served by the brighter ZK521ST-B.
Both fit
- Family Setup
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