Comparison
GT3900UHD vs ZH451ST
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A side-by-side look at how the Optoma GT3900UHD and Optoma ZH451ST 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 GT3900UHD and ZH451ST
Buy GT3900UHD
Prices confirmed Nov 10, 2026 · we check every retailer daily
Buy ZH451ST
Prices confirmed Nov 10, 2026 · we check every retailer daily
When you buy through links on Northcourse, we may earn a commission at no additional cost to you. Read the full affiliate disclosure
Full specificationsEvery spec for both, line by line
Specifications
The numbers, lined up.
Image
| Spec | GT3900UHD | ZH451ST |
|---|---|---|
| Resolution | 4K UHD (3840×2160) | 1080p (1920×1080) |
| Lumens | 4,000 (ISO 21118) | 4,200 (ISO 21118) |
| HDR | HDR10, HLG | — |
| Picture Mode | Golf Mode | — |
| Screen Size | 30–150 in (Optoma's page and datasheet) | — |
- ResolutionGT3900UHD4K UHD (3840×2160)ZH451ST1080p (1920×1080)
- LumensGT3900UHD4,000 (ISO 21118)ZH451ST4,200 (ISO 21118)
- HDRGT3900UHDHDR10, HLGZH451ST—
- Picture ModeGT3900UHDGolf ModeZH451ST—
- Screen SizeGT3900UHD30–150 in (Optoma's page and datasheet)ZH451ST—
Hardware
| Spec | GT3900UHD | ZH451ST |
|---|---|---|
| Light Source | DuraCore laser (30,000 hours, eco) | Laser (30,000 hours) |
| Throw Ratio | 0.496:1 (fixed) | 0.496:1 (fixed) |
| Offset | 114% (±5%); no lens shift | 116% (±5%); no lens shift |
| Dimensions | 10.8 × 8.5 × 4.5 in (W × D × H, datasheet) | 10.79 × 8.5 × 4.49 in (W × D × H) |
- Light SourceGT3900UHDDuraCore laser (30,000 hours, eco)ZH451STLaser (30,000 hours)
- Throw RatioGT3900UHD0.496:1 (fixed)ZH451ST0.496:1 (fixed)
- OffsetGT3900UHD114% (±5%); no lens shiftZH451ST116% (±5%); no lens shift
- DimensionsGT3900UHD10.8 × 8.5 × 4.5 in (W × D × H, datasheet)ZH451ST10.79 × 8.5 × 4.49 in (W × D × H)
Requirements
| Spec | GT3900UHD | ZH451ST |
|---|---|---|
| Throw Distance | 100 in at about 3.6 ft (Optoma's manual) | 100 in at about 3.6 ft (Optoma's manual) |
- Throw DistanceGT3900UHD100 in at about 3.6 ft (Optoma's manual)ZH451ST100 in at about 3.6 ft (Optoma's manual)
Performance
| Spec | GT3900UHD | ZH451ST |
|---|---|---|
| Input Lag | As low as 4.3 ms at 1080p/240Hz (Optoma) | — |
- Input LagGT3900UHDAs low as 4.3 ms at 1080p/240Hz (Optoma)ZH451ST—
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 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.
- Family Setup
4K for movies, low lag for games (4.3 ms at 1080p/240Hz, per Optoma) and a golf picture mode, for $1,499.
- 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.
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