Optoma ZH451 vs Optoma ZK451
 | | |
|---|---|---|
| Key differences | ||
| White light outputISO | 4,600 lm ISO | 4,500 lm ISO |
| Native resolution | 1080p (1920 × 1080) | — |
| HDR formats | — | HDR10, HLG |
| Fan noise | Max 31 dB(A) · Eco 29 dB(A) | Max 35 dB(A) · Eco 29 dB(A) |
| Room fit | ||
| Distance to screen | 3.1–5.0 m | 3.1–5.0 m |
| Brightness | ||
| Rated brightness | 4,600 lmDerived | 4,500 lmDerived |
| White light outputISO | 4,600 lm ISO | 4,500 lm ISO |
| Brightness uniformity | 75% | 75% |
| Display system | ||
| Imaging technology | DLP | DLP |
| On-screen resolution | 1080p (1920 × 1080)Derived | 4K UHD (3840 × 2160)Derived |
| Native resolution | 1080p (1920 × 1080) | — |
| Native aspect | 16:9Derived | 16:9Derived |
| Addressable resolution | — | 4K UHD (3840 × 2160) |
| Contrast | ||
| Dynamic contrast | 3,000,000:1 | 2,000,000:1 |
| Colour | ||
| Colour bit depth (per channel) | 10 bit | — |
| Gamma / EOTF presets | — | 2.2, 2.4 |
| HDR | ||
| HDR formats | — | HDR10, HLG |
| Calibration | ||
| Colour management (CMS) | — | 6-axis |
| 3D | ||
| 3D | Yes | Yes |
| 3D formats | + Frame packing, Side-by-side, Top-bottom | Side-by-side, Top-bottom, + Frame sequential |
| 3D glasses sync | DLP-Link | DLP-Link |
| Light source | ||
| Light source | Laser (phosphor) | Laser (phosphor) |
| Emitter | — | Blue laser + phosphor |
| Light-source life | 30,000 h | 30,000 h eco |
| Light output control | Steps | Steps |
| Cool-down time | — | 90 s |
| Optics | ||
| Throw ratio | 1.4–2.24:1 | 1.4–2.24:1 |
| Image size | 30–300 in | 30–300 in |
| Projection offset | 116% | 116% |
| Zoom | Optical | Optical |
| Zoom ratio | 1.6×Derived | 1.6×Derived |
| Focal length | 20.91–32.62 mm | 20.91–32.62 mm |
| Aperture (f-number) | 2.5–3.26 | 2.5–3.26 |
| Focus | Manual | Manual |
| Autofocus | No | No |
| Vertical keystone | 30° | 30° |
| Horizontal keystone | 30° | 30° |
| Corner correction | 4-corner | 4-corner |
| Grid warp | — | Yes |
| Auto setup | — | Fit to screen, Obstacle avoidance |
| Motion & gaming | ||
| Input lag | 1080p: 60 Hz 17 ms · 120 Hz 8.6 ms · 4K UHD: 60 Hz 16.9 ms | 1080p: 60 Hz 16.7 ms · 120 Hz 8.6 ms · 4K UHD: 60 Hz 16.7 ms |
| Lowest input lag | 8.6 msDerived | 8.6 msDerived |
| Input lag at 4K 60 Hz | 16.9 msDerived | 16.7 msDerived |
| Inputs & control | ||
| HDMI inputs | 2 × HDMI 2.0 | 2 × HDMI 2.0 |
| HDMI inputs (count) | 2Derived | 2Derived |
| Newest HDMI version | HDMI 2.0Derived | HDMI 2.0Derived |
| Other video inputs | VGA | — |
| Max input resolution | 4K UHD | 4K UHD |
| Audio inputs | 3.5 mm | — |
| Control ports | RS-232, + 12 V trigger | RS-232 |
| PJLink | Class 2 | — |
| Control-system drivers | Crestron, AMX | Crestron, AMX |
| Horizontal scan | 15–135 kHz | 15–150 kHz |
| Vertical scan | 24–120 Hz | 24–240 Hz |
| Smart platform | ||
| Ethernet | Yes | Yes |
| Audio | ||
| Speaker power | 15 W | 15 W |
| Speakers | 1 | 1 |
| Layout | Mono | — |
| Audio outputs | 3.5 mm | 3.5 mm |
| HDMI audio return | NoneDerived | NoneDerived |
| Physical & installation | ||
| Dimensions (W × D × H) | 274 × 216 × 114 mm | 274 × 216 × 114 mm |
| Weight | 2,998 g | 2,900 g |
| Orientations | Table, Ceiling, Rear, Portrait, 360° | Table, Ceiling, Rear, Portrait, 360° |
| Ceiling mount | M4, screws ≥ 10 mm | M4, screws ≥ 10 mm |
| Dust filter | — | None |
| Ingress protection | IP6X | IP6X (light engine) |
| Sealed optical engine | — | Yes |
| Environment & power | ||
| Operating temperature | 0–40°C | 0–40°C |
| Operating humidity | 0–80%RH | — |
| Altitude | 2,500 m · high-altitude mode | 3,048 m |
| Power draw | Max 170 W · Eco 120 W | Max 178 W · Eco 124 W |
| Standby | Up to 0.5 W | Up to 0.5 W |
| Power supply | External adapter | External adapter |
| Mains input | 100–240 V · 50/60 Hz | 100–240 V · 50/60 Hz |
| Noise | ||
| Fan noise | Max 31 dB(A) · Eco 29 dB(A) | Max 35 dB(A) · Eco 29 dB(A) |
| Safety & compliance | ||
| Laser class | Class 1 | Class 1 |
| Risk group | RG2 | RG2 |
| FDA laser notice | — | Notice 57 |
| Marks | FCC | FCC |
| Support & ownership | ||
| Warranty | — | 3 yr (light source 5 yr or 12,000 h) |
| User manual | https://region-resource.optoma.com/products/documents/mpTwkm9mUWvfsgMhppFmV04EqeoeeRYWmvKy7tBF.pdf | https://region-resource.optoma.com/products/documents/LaU8Uwg9XFPmrLtSBvohDroL18wojvZr27JsfxCM.pdf |
| In the box | ||
| In the box | Power cord, Remote, Remote batteries, + User manual | Power cord, Remote, Remote batteries, + Quick start guide |