BenQ AK800ST vs ViewSonic LS740-4K
 BenQ AK800STMSRP $3,999 |  ViewSonic LS740-4K$1,799.99 | |
|---|---|---|
| Key differences | ||
| Native resolution | — | 4K UHD (3840 × 2160) |
| Throw ratio | 0.69–0.83:1 | 1.4–2.24:1 |
| Lowest input lag | 4.8 msDerived | — |
| HDR formats | + HDR10, HLG | HLG |
| Fan noise | Normal 34 dB(A) · Eco 29 dB(A) | Normal 32 dB(A) · Eco 27 dB(A) |
| Price | MSRP $3,999 | $1,799.99 |
| Room fit | ||
| Distance to screen | 1.5–1.8 m | 3.1–5.0 m |
| Brightness | ||
| Rated brightness | 5,000 lmDerived | 5,000 lmDerived |
| White light outputANSI | 5,000 lm ANSI | 5,000 lm ANSI |
| Display system | ||
| Imaging technology | DLP | DLP |
| Chip / panel diagonal | 0.65 in | 0.65 in |
| On-screen resolution | 4K UHD (3840 × 2160)Derived | 4K UHD (3840 × 2160)Derived |
| Native resolution | — | 4K UHD (3840 × 2160) |
| Native aspect | 16:9Derived | 16:9Derived |
| Addressable resolution | 4K UHD (3840 × 2160) | — |
| Contrast | ||
| Dynamic contrast | 3,000,000:1 | 3,000,000:1 |
| Colour | ||
| Colour gamut | Rec. 709 97% coverage | — |
| Colour bit depth (per channel) | 10 bit | 10 bit |
| HDR | ||
| HDR formats | + HDR10, HLG | HLG |
| Calibration | ||
| Colour management (CMS) | 6-axis | — |
| Greyscale control points | 11 | — |
| 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) | Laser (phosphor) |
| Emitter | Blue laser + phosphor | Blue laser + phosphor |
| Light-source life | 20,000 h normal · 30,000 h eco | 20,000 h normal · 30,000 h super eco |
| Light output control | Continuous | — |
| Optics | ||
| Throw ratio | 0.69–0.83:1 | 1.4–2.24:1 |
| Throw measured from | Lens | — |
| Image size | 60–300 in | 30–300 in |
| Projection offset | 103% | 124% |
| Zoom | Optical | Optical |
| Zoom ratio | 1.2×Derived | 1.6×Derived |
| Focal length | 10.31–12.32 mm | — |
| Aperture (f-number) | 2.49–2.7 | — |
| Focus | Motorised | Manual |
| Autofocus | Yes | No |
| Autofocus runs | On demand | — |
| Vertical keystone | 30° | 30° |
| Horizontal keystone | 30° | 30° |
| Corner correction | 4-corner | — |
| Grid warp | Yes | Yes |
| Auto setup | Fit to screen | — |
| Motion & gaming | ||
| Frame interpolation (MEMC) | Yes | — |
| Max input refresh | 1080p: 240 Hz · 4K UHD: 60 Hz | 1080p: 240 Hz · 2560 × 1440: 120 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 18.6 ms · 120 Hz 9.7 ms · 240 Hz 4.8 ms · 4K UHD: 60 Hz 18.1 ms | — |
| Lowest input lag | 4.8 msDerived | — |
| Input lag at 4K 60 Hz | 18.1 msDerived | — |
| Gaming features | ALLM | — |
| Inputs & control | ||
| HDMI inputs | 2 × HDMI 2.1 (HDCP 2.3) · HDMI 2.1 (eARC, HDCP 2.3) | 2 × HDMI 2.0 (HDCP 2.3) |
| HDMI inputs (count) | 3Derived | 2Derived |
| Newest HDMI version | HDMI 2.1Derived | HDMI 2.0Derived |
| Max input resolution | 4K UHD | 4K UHD |
| USB media playback | Yes | — |
| Control ports | RS-232 | RS-232 |
| Horizontal scan | 15–135 kHz | 15–135 kHz |
| Vertical scan | 23–240 Hz | 24–240 Hz |
| Smart platform | ||
| Ethernet | Yes | Yes |
| Security updates until | 31 Aug 2029 | — |
| Casting | Chromecast built-in, Miracast | — |
| Audio | ||
| Speaker power | 10 W | 15 W |
| Speakers | 1 | 1 |
| Audio outputs | 3.5 mm, + HDMI eARC | 3.5 mm |
| HDMI audio return | eARCDerived | NoneDerived |
| Physical & installation | ||
| Dimensions (W × D × H) | 388 × 302 × 140 mm | 286 × 216 × 129 mm |
| Weight | 5,900 g | 3,100 g |
| Orientations | Table, Ceiling, + Rear | Table, Ceiling, + Portrait, + 360° |
| Ceiling mount | M4 | — |
| Dust filter | None | None |
| Ingress protection | IP5X (light engine) | IP6X |
| Sealed optical engine | Yes | Yes |
| Environment & power | ||
| Operating temperature | 0–40°C | 0–40°C |
| Operating humidity | 10–90%RH | 10–80%RH |
| Altitude | 3,000 m · high-altitude mode | 3,658 m · high-altitude mode |
| Power draw | Max 327 W · Normal 285 W · Eco 223 W | 165 W |
| Standby | Up to 0.5 W | Up to 0.5 W |
| Networked standby | Up to 2 W | — |
| Power supply | — | External adapter |
| Mains input | 100–240 V · 50/60 Hz | 100–240 V · 50/60 Hz |
| Noise | ||
| Fan noise | Normal 34 dB(A) · Eco 29 dB(A) | Normal 32 dB(A) · Eco 27 dB(A) |
| Safety & compliance | ||
| Laser class | Class 1 | Class 1 |
| Risk group | RG2 | RG2 |
| Hazard distance | — | 1 m |
| Marks | — | CE, FCC |
| Support & ownership | ||
| Warranty | 3 yr | 3 yr |
| User manual | https://esupportdownload.benq.com/esupport/PROJECTOR%20FOR%20CONSUMER/UserManual/AK800ST/AK800ST_UM_EN_261009133619.pdf | https://www.viewsonicglobal.com/public/products_download/user_guide/projector/LSD500-4K/LSD500-4K_LS740-4K_UG_ENG.pdf |
| Spare parts | Mount CM00G3 | — |
| In the box | ||
| In the box | Power cord, Remote, Remote batteries, Quick start guide, + Warranty card | Power cord, + Power adapter, Remote, Remote batteries, Quick start guide |
| Remote | IR | IR |