Optoma GT3900UHD vs ViewSonic PX748-4K
 Optoma GT3900UHD$1,499 |  MSRP $1,099 | |
|---|---|---|
| Key differences | ||
| White light output | 4,000 lm ISO | 4,000 lm ANSI |
| Throw ratio | 0.5:1 | 1.13–1.47:1 |
| Lowest input lag | 4.3 msDerived | 4.2 msDerived |
| Light source | Laser (phosphor) | Lamp |
| Fan noise | Normal 35 dB(A) · Eco 28 dB(A) | Normal 33 dB(A) · Eco 28 dB(A) |
| Price | $1,499 | MSRP $1,099 |
| Room fit | ||
| Distance to screen | 1.1 m | 2.5–3.3 m |
| Brightness | ||
| Rated brightness | 4,000 lmDerived | 4,000 lmDerived |
| White light output | 4,000 lm ISO | 4,000 lm ANSI |
| Brightness uniformity | 75% | — |
| Display system | ||
| Imaging technology | DLP | DLP |
| On-screen resolution | 4K UHD (3840 × 2160)Derived | 4K UHD (3840 × 2160)Derived |
| Native aspect | 16:9Derived | 16:9Derived |
| Addressable resolution | 4K UHD (3840 × 2160) | 4K UHD (3840 × 2160) |
| Contrast | ||
| Dynamic contrast | 2,000,000:1 | 12,000:1 |
| Colour | ||
| Colour bit depth (per channel) | 10 bitDerived | 10 bit |
| Gamma / EOTF presets | 2.2, 2.4 | — |
| HDR | ||
| HDR formats | HDR10, HLG | HDR10, HLG |
| Calibration | ||
| Colour management (CMS) | 6-axis | — |
| Picture mode memories | — | 2 |
| Picture certifications | ISF | — |
| 3D | ||
| 3D | Yes | — |
| 3D formats | Frame packing, Side-by-side, Top-bottom, Frame sequential | — |
| 3D glasses sync | DLP-Link | — |
| Light source | ||
| Light source | Laser (phosphor) | Lamp |
| Emitter | Blue laser + phosphor | — |
| Light engine | DuraCore | — |
| Lamp power | — | 240 W |
| Replacement lamp | — | RLC-127 |
| Light-source life | 30,000 h eco | 4,000 h normal · 20,000 h dynamic |
| Light output control | Steps | — |
| Constant brightness mode | Yes | — |
| Warm-up time | 10 s | — |
| Cool-down time | 10 s | — |
| Optics | ||
| Throw ratio | 0.5:1 | 1.13–1.47:1 |
| Image size | 30–150 in | 30–300 in |
| Projection offset | 114% | — |
| Zoom | None | Optical |
| Zoom ratio | — | 1.3×Derived |
| Focal length | 7.51 mm | — |
| Aperture (f-number) | 2.8 | — |
| Focus | Manual | Manual |
| Autofocus | No | — |
| Vertical lens shift | None | — |
| Horizontal lens shift | None | — |
| Vertical keystone | 15° | 40° |
| Horizontal keystone | 15° | 40° |
| Auto keystone | — | Yes |
| Corner correction | — | 4-corner |
| Grid warp | Yes | Yes |
| Interchangeable lens | — | No |
| Motion & gaming | ||
| Max input refresh | 1080p: 240 Hz · 4K UHD: 60 Hz | 1080p: 240 Hz · 4K UHD: 60 Hz |
| Max refresh at 1080p | 240 HzDerived | 240 HzDerived |
| Max refresh at 4K | 60 HzDerived | 60 HzDerived |
| Input lag | 1080p: 60 Hz 16.7 ms · 120 Hz 8.6 ms · 240 Hz 4.3 ms · 4K UHD: 60 Hz 16.7 ms | 1080p: 240 Hz 4.2 ms |
| Lowest input lag | 4.3 msDerived | 4.2 msDerived |
| Input lag at 4K 60 Hz | 16.7 msDerived | — |
| Inputs & control | ||
| HDMI inputs | HDMI 2.0 · HDMI 2.0 (eARC) | 2 × HDMI 2.0 (HDCP 2.2) |
| HDMI inputs (count) | 2Derived | 2Derived |
| Newest HDMI version | HDMI 2.0Derived | HDMI 2.0Derived |
| Max input resolution | 4K UHD | 4K UHD |
| Control ports | RS-232, 12 V trigger | RS-232, 12 V trigger |
| PJLink | Class 1 | — |
| Control-system drivers | Crestron | — |
| Horizontal scan | 15–150 kHz | 15–129 kHz |
| Vertical scan | 24–240 Hz | 23–240 Hz |
| Smart platform | ||
| Ethernet | Yes | Yes |
| Audio | ||
| Speaker power | 15 W | 10 W |
| Speakers | 1 | 1 |
| Layout | Mono | Mono |
| Audio outputs | 3.5 mm, + HDMI eARC | 3.5 mm |
| HDMI audio return | eARCDerived | NoneDerived |
| Physical & installation | ||
| Dimensions (W × D × H) | 274 × 216 × 114 mm | 312 × 222 × 108 mm |
| Weight | 2,900 g | 2,800 g |
| Colours | Black | — |
| Orientations | Table, Ceiling, Rear, + Portrait, + 360° | Table, Ceiling, Rear |
| Ceiling mount | — | M4, screws ≤ 8 mm |
| Ingress protection | IP6X | — |
| Environment & power | ||
| Operating temperature | 0–40°C | 0–40°C |
| Operating humidity | 10–85%RH | 0–90%RH |
| Altitude | 2,500 m · high-altitude mode | 3,000 m · high-altitude mode |
| Power draw | Max 178 W · Normal 178 W · Eco 125 W | 310 W |
| Standby | Up to 0.5 W | Up to 0.5 W |
| Power supply | External adapter | — |
| Mains input | 100–240 V · 50/60 Hz | 100–240 V · 50/60 Hz |
| Noise | ||
| Fan noise | Normal 35 dB(A) · Eco 28 dB(A) | Normal 33 dB(A) · Eco 28 dB(A) |
| Safety & compliance | ||
| Laser class | Class 1 | — |
| Risk group | RG2 | RG2 |
| Hazard distance | 1 m | — |
| Marks | + CE, FCC | FCC |
| Support & ownership | ||
| Warranty | 5 yr or 12,000 h | 3 yr (light source 1 yr) |
| User manual | https://region-resource.optoma.com/products/documents/CWqYJUpb2tPRrTwMj1QGYRcPXH2q7xeKXHsKXAZ4.pdf | https://www.viewsonicglobal.com/public/products_download/user_guide/Projector/PX701-4K_PX728-4K_PX748-4K/PX701-4K_PX728-4K_PX748-4K_UG_ENG.pdf |
| In the box | ||
| In the box | Power cord, + Power adapter, Remote, + Remote batteries, Quick start guide, + Warranty card | Power cord, Remote, Quick start guide, + USB cable |
| Remote | IR | IR |