Optoma ZH451ST vs Optoma ZK450
 $1,499 |  Optoma ZK450MSRP $5,749 | |
|---|---|---|
| Key differences | ||
| White light output | 4,200 lm ISO | — |
| Native resolution | 1080p (1920 × 1080) | — |
| Throw ratio | 0.5:1 | 1.4–2.24:1 |
| Lowest input lag | 8.4 msDerived | 4.4 msDerived |
| Fan noise | Normal 36 dB(A) · Eco 29 dB(A) | Max 35 dB(A) · Normal 28 dB(A) |
| Price | $1,499 | MSRP $5,749 |
| Room fit | ||
| Distance to screen | 1.1 m | 3.1–5.0 m |
| Brightness | ||
| Rated brightness | 4,200 lmDerived | — |
| White light output | 4,200 lm ISO | — |
| Claimed brightness (non-standard) | — | 4,200 lm |
| Brightness uniformity | 75% | 80% |
| Display system | ||
| Imaging technology | DLP | DLP |
| Chip / panel diagonal | — | 0.65 in |
| 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 | 2,000,000:1 | 300,000:1 |
| Colour | ||
| Colour bit depth (per channel) | 10 bit | — |
| Gamma / EOTF presets | 2.2, 2.4 | 2.2, 2.4 |
| HDR | ||
| HDR formats | HDR10, HLG | HDR10, HLG |
| Calibration | ||
| Colour management (CMS) | 6-axis | 6-axis |
| Picture certifications | ISF, Filmmaker Mode | — |
| 3D | ||
| 3D | Yes | Yes |
| 3D formats | Side-by-side, Top-bottom, Frame sequential | 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 engine | DuraCore | — |
| Light-source life | 30,000 h | Up to 30,000 h max |
| Light output control | Steps | Steps |
| Constant brightness mode | Yes | — |
| Cool-down time | 90 s | 90 s |
| Optics | ||
| Throw ratio | 0.5:1 | 1.4–2.24:1 |
| Image size | 30–300 in | 26–303 in |
| Projection offset | 116% | 116% |
| Zoom | Digital | Optical |
| Zoom ratio | — | 1.6×Derived |
| Focal length | 7.51 mm | 20.91–32.62 mm |
| Aperture (f-number) | 2.8 | 2.5–3.26 |
| Focus | Manual | Manual |
| Autofocus | No | No |
| Vertical keystone | 15° | 30° |
| Horizontal keystone | 15° | 30° |
| Corner correction | 4-corner | 4-corner |
| Motion & gaming | ||
| Max input refresh | — | 1080p: 240 Hz · 4K UHD: 60 Hz |
| Max refresh at 1080p | — | 240 HzDerived |
| Max refresh at 4K | — | 60 HzDerived |
| Input lag | About 1080p: 60 Hz 16.7 ms · 120 Hz 8.4 ms · 4K UHD: 60 Hz 16.7 ms | 1080p: 60 Hz 16 ms · 120 Hz 8 ms · 240 Hz 4.4 ms · 4K UHD: 60 Hz 16 ms |
| Lowest input lag | 8.4 msDerived | 4.4 msDerived |
| Input lag at 4K 60 Hz | 16.7 msDerived | 16 msDerived |
| Inputs & control | ||
| HDMI inputs | 2 × HDMI 2.0 | HDMI 2.0 · HDMI 2.0 (eARC) |
| 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 |
| Control ports | RS-232, + Wired IR, + 12 V trigger | RS-232 |
| PJLink | Class 1 | — |
| Control-system drivers | Crestron | Crestron, + AMX |
| Horizontal scan | 15–135 kHz | 15–140 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, HDMI eARC |
| HDMI audio return | — | eARCDerived |
| Physical & installation | ||
| Dimensions (W × D × H) | 274 × 216 × 114 mm | 274 × 216 × 114 mm |
| Weight | 3,000 g | 3,000 g |
| Orientations | Portrait, 360° | + Table, + Ceiling, + Rear, Portrait, 360° |
| Ceiling mount | M4, 10 mm screws | M4, screws ≥ 10 mm |
| Ingress protection | IP6X | IP6X |
| Environment & power | ||
| Operating temperature | 0–40°C | 0–40°C |
| Altitude | 2,500 m · high-altitude mode | — |
| Power draw | Max 170 W | Max 185 W · Eco 126 W |
| Standby | Up to 0.5 W | Up to 0.5 W |
| Networked standby | — | Up to 2 W |
| Power supply | External adapter | External adapter |
| Mains input | 100–240 V · 50/60 Hz | 100–240 V · 50/60 Hz |
| Noise | ||
| Fan noise | Normal 36 dB(A) · Eco 29 dB(A) | Max 35 dB(A) · Normal 28 dB(A) |
| Safety & compliance | ||
| Laser class | Class 1 | Class 1 |
| Risk group | RG2 | RG2 |
| Hazard distance | 1 m | — |
| FDA laser notice | — | Notice 57 |
| Marks | FCC | FCC |
| Support & ownership | ||
| Warranty | — | 1 yr (light source 5 yr or 12,000 h) |
| User manual | https://region-resource.optoma.com/products/documents/0NL94Q0vvVEJVe7dxQKlMzhtuURlT8FwUXNkLi8y.pdf | https://region-resource.optoma.com/products/import/Documents/cbd58627-8cc5-43de-9633-fa24cd20bd45.pdf |
| In the box | ||
| In the box | Power cord, Remote, Remote batteries, Quick start guide | Power cord, + Power adapter, Remote, Remote batteries, Quick start guide, + User manual |
| Remote | IR | — |