Optoma ZH450ST vs Optoma ZK420UST
 MSRP $3,499 | | |
|---|---|---|
| Key differences | ||
| White light output | — | 4,200 lm ANSI |
| Native resolution | 1080p (1920 × 1080) | — |
| Throw ratio | 0.5:1 | 0.25:1 |
| Lowest input lag | 8.6 msDerived | 4.3 msDerived |
| Fan noise | Max 34 dB(A) · Normal 32 dB(A) | Max 34 dB(A) · Eco 29 dB(A) |
| Price | MSRP $3,499 | — |
| Room fit | ||
| Distance to screen | 1.1 m | 0.55 m |
| Brightness | ||
| Rated brightness | — | 4,200 lmDerived |
| White light output | — | 4,200 lm ANSI |
| Claimed brightness (non-standard) | 4,200 lm | — |
| Brightness uniformity | 75% | 75% |
| 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 |
| Pixel shift | — | XPR 4-way |
| Addressable resolution | — | 4K UHD (3840 × 2160) |
| Contrast | ||
| Dynamic contrast | 2,000,000:1 | 500,000:1 |
| Colour | ||
| Colour bit depth (per channel) | 10 bit | — |
| Gamma / EOTF presets | — | 2.2, 2.4 |
| HDR | ||
| HDR formats | HDR10, HLG | HDR10, HLG |
| 3D | ||
| 3D | Yes | Yes |
| 3D formats | Frame packing, Side-by-side, Top-bottom, Frame sequential | Frame packing, Side-by-side, Top-bottom, Frame sequential |
| 3D glasses sync | DLP-Link | DLP-Link |
| Light source | ||
| Light source | Laser (phosphor) | Laser (phosphor) |
| Light-source life | 30,000 h | 30,000 h eco |
| Light output control | Steps | Steps |
| Optics | ||
| Throw ratio | 0.5:1 | 0.25:1 |
| Image size | 36–292 in | 100–150 in |
| Projection offset | 116% | 120% |
| Zoom | None | None |
| Focal length | 7.51 mm | 3.7 mm |
| Aperture (f-number) | 2.8 | 2.44 |
| Focus | Manual | Manual |
| Autofocus | No | — |
| Vertical keystone | 30° | — |
| Horizontal keystone | 30° | — |
| Corner correction | 4-corner | 4-corner |
| Grid warp | — | Yes |
| Interchangeable lens | — | No |
| Motion & gaming | ||
| Max input refresh | 1080p: 120 Hz | — |
| Max refresh at 1080p | 120 HzDerived | — |
| Input lag | 1080p: 60 Hz 17 ms · 120 Hz 8.6 ms | 1080p: 60 Hz 17 ms · 120 Hz 8.6 ms · 240 Hz 4.3 ms · 4K UHD: 60 Hz 16.9 ms |
| Lowest input lag | 8.6 msDerived | 4.3 msDerived |
| Input lag at 4K 60 Hz | — | 16.9 msDerived |
| Inputs & control | ||
| HDMI inputs | 2 × HDMI 2.0 (HDCP 2.2) | 2 × HDMI 2.0 |
| HDMI inputs (count) | 2Derived | 2Derived |
| Newest HDMI version | HDMI 2.0Derived | HDMI 2.0Derived |
| Other video inputs | — | HDBaseT |
| Max input resolution | 4K UHD | 4K UHD |
| Control ports | RS-232 | RS-232 |
| Horizontal scan | 15–140 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 | Mono |
| Audio outputs | 3.5 mm | 3.5 mm, + HDMI eARC |
| HDMI audio return | NoneDerived | eARCDerived |
| Physical & installation | ||
| Dimensions (W × D × H) | 274 × 216 × 114 mm | 327 × 328 × 110 mm |
| Weight | 3,000 g | 4,200 g |
| Orientations | + Table, + Ceiling, + Rear, 360° | + Portrait, 360° |
| Ceiling mount | M4, screws ≥ 10 mm | M4, 10 mm screws |
| Ingress protection | IP6X | IP6X |
| Environment & power | ||
| Operating temperature | 0–40°C | 0–40°C |
| Operating humidity | 0–80%RH | 10–85%RH |
| Altitude | 2,500 m · high-altitude mode | 3,048 m · high-altitude mode |
| Power draw | Max 173 W · Eco 119 W | Max 255 W · Eco 180 W |
| Standby | Up to 0.5 W | 0.5 W |
| Power supply | External adapter | External adapter |
| Mains input | 100–240 V · 50/60 Hz | 100–240 V · 50/60 Hz |
| DC input | — | 24 V |
| Noise | ||
| Fan noise | Max 34 dB(A) · Normal 32 dB(A) | Max 34 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) | 3 yr (light source 5 yr or 12,000 h) |
| User manual | https://region-resource.optoma.com/products/import/Documents/02387d20-4b12-4d04-97e4-be316b803cf2.pdf | — |
| In the box | ||
| In the box | Power cord, Remote, Remote batteries, + User manual | Power cord, + Power adapter, Remote, Remote batteries, + Quick start guide |
| Remote | IR | IR |