Comparison
IN1028ST vs ZK431ST-B
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A side-by-side look at how the InFocus IN1028ST 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 | IN1028ST | ZK431ST-B |
|---|---|---|
| Resolution | 1080p (1920×1080), 0.65-in DMD | 4K UHD (3840×2160); Optoma calls it True 4K UHD and names no chip |
| Lumens | 4,000 (standard not stated) | 4,100 (ISO 21118) |
| Picture Mode | — | 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) |
- ResolutionIN1028ST1080p (1920×1080), 0.65-in DMDZK431ST-B4K UHD (3840×2160); Optoma calls it True 4K UHD and names no chip
- LumensIN1028ST4,000 (standard not stated)ZK431ST-B4,100 (ISO 21118)
- Picture ModeIN1028ST—ZK431ST-BGolf Sim colour mode (preset)
- Screen SizeIN1028ST—ZK431ST-B36–300 in (Optoma's spec table says 30–300, its feature list 36–300; the narrower range is used)
Hardware
| Spec | IN1028ST | ZK431ST-B |
|---|---|---|
| Light Source | Laser (up to 30,000 hours) | DuraCore laser (30,000 hours, eco) |
| Throw Ratio | 0.496:1 (fixed) | 0.496:1 (short throw, fixed) |
| Offset | 116%; no lens shift (InFocus's API datasheet and user guide; its Nemesis II PDF datasheet prints 112%) | — |
| Dimensions | 10.94 × 8.5 × 4.6 in (W × D × H) | — |
| Lens | — | Fixed 0.496:1 short-throw lens (no zoom, no lens shift) |
| Keystone | — | ±15° with Smart Fit auto-alignment |
- Light SourceIN1028STLaser (up to 30,000 hours)ZK431ST-BDuraCore laser (30,000 hours, eco)
- Throw RatioIN1028ST0.496:1 (fixed)ZK431ST-B0.496:1 (short throw, fixed)
- OffsetIN1028ST116%; no lens shift (InFocus's API datasheet and user guide; its Nemesis II PDF datasheet prints 112%)ZK431ST-B—
- DimensionsIN1028ST10.94 × 8.5 × 4.6 in (W × D × H)ZK431ST-B—
- LensIN1028ST—ZK431ST-BFixed 0.496:1 short-throw lens (no zoom, no lens shift)
- KeystoneIN1028ST—ZK431ST-B±15° with Smart Fit auto-alignment
Requirements
| Spec | IN1028ST | ZK431ST-B |
|---|---|---|
| Throw Distance | 100 in at about 3.6 ft (InFocus's user guide) | — |
- Throw DistanceIN1028ST100 in at about 3.6 ft (InFocus's user guide)ZK431ST-B—
Performance
| Spec | IN1028ST | ZK431ST-B |
|---|---|---|
| Input Lag | 49.8 ms at 1080p/60Hz (InFocus datasheet) | 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 LagIN1028ST49.8 ms at 1080p/60Hz (InFocus datasheet)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
Honest persona fit, side by side.
Better for ZK431ST-B
- Performance Seeker
4K with published low lag and a dedicated Golf Sim colour preset, so there is a sensible starting point without a calibration session. 4,100 lumens holds up in a room that is not fully blacked out.
- Space-Constrained
0.496:1 puts a 100-inch image up from about 3.6 feet, so it mounts close and stays out of the swing path. That is the tightest throw in the catalog, shared in 4K with the GT3900UHD, UHZ35ST and BenQ LK830ST.
- Family Setup
Bright enough for a room with ambient light and fast enough to game on, which is what a shared room actually gets used for between rounds.
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