Comparison
ZK608TST vs ZU820TST
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A side-by-side look at how the Optoma ZK608TST and Optoma ZU820TST 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 ZK608TST and ZU820TST
Buy ZK608TST
Prices confirmed Nov 10, 2026 · we check every retailer daily
Buy ZU820TST
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 | ZK608TST | ZU820TST |
|---|---|---|
| Resolution | 4K UHD (3840×2160) | WUXGA (1920×1200), 16:10 |
| Lumens | 6,000 (standard not stated) | 8,100 (6,900 ANSI) to plan on; Optoma's US page and US datasheet say 8,200, its Australian page and 2023 datasheet 8,100 |
- ResolutionZK608TST4K UHD (3840×2160)ZU820TSTWUXGA (1920×1200), 16:10
- LumensZK608TST6,000 (standard not stated)ZU820TST8,100 (6,900 ANSI) to plan on; Optoma's US page and US datasheet say 8,200, its Australian page and 2023 datasheet 8,100
Hardware
| Spec | ZK608TST | ZU820TST |
|---|---|---|
| Light Source | DuraCore laser (30,000 hours) | DuraCore laser (30,000 hours) |
| Throw Ratio | 0.58:1 (fixed) | 0.75–0.95 (1.26× motorized zoom) |
| Lens Shift | Vertical 106%–116%, horizontal ±4% (manual) | Motorized; vertical ±50%, horizontal ±15% |
| Dimensions | 14.72 × 11.89 × 4.61 in (W × D × H) | 19.13 × 15.53 × 7.3 in (W × D × H) |
- Light SourceZK608TSTDuraCore laser (30,000 hours)ZU820TSTDuraCore laser (30,000 hours)
- Throw RatioZK608TST0.58:1 (fixed)ZU820TST0.75–0.95 (1.26× motorized zoom)
- Lens ShiftZK608TSTVertical 106%–116%, horizontal ±4% (manual)ZU820TSTMotorized; vertical ±50%, horizontal ±15%
- DimensionsZK608TST14.72 × 11.89 × 4.61 in (W × D × H)ZU820TST19.13 × 15.53 × 7.3 in (W × D × H)
Requirements
| Spec | ZK608TST | ZU820TST |
|---|---|---|
| Throw Distance | 100 in at about 4.2 ft, from the ratio | 100 in (16:10) at about 5.3–6.7 ft (Optoma's manual) |
- Throw DistanceZK608TST100 in at about 4.2 ft, from the ratioZU820TST100 in (16:10) at about 5.3–6.7 ft (Optoma's manual)
Performance
| Spec | ZK608TST | ZU820TST |
|---|---|---|
| Input Lag | 16.9 ms at 4K/60Hz and 4.36 ms at 1080p/240Hz with Gaming Mode on; about 34 ms with it off (Optoma's manual) | — |
- Input LagZK608TST16.9 ms at 4K/60Hz and 4.36 ms at 1080p/240Hz with Gaming Mode on; about 34 ms with it off (Optoma's manual)ZU820TST—
Room planner
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Who each one is better for
Honest persona fit, side by side.
Better for ZK608TST
- Showroom
6,000 lumens of 4K from a 0.58 throw, for a premium room where the projector has to stay close to the screen.
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