BenQ TH671ST vs Optoma UHZ50

Bold marks the better figure where both are stated to the same standard. “—” means the manufacturer doesn't state it.

	BenQ TH671ST MSRP $749	Optoma UHZ50 MSRP $2,799
Display system
Imaging technology	DLP	DLP
Technology brand	DLP	DLP
Number of imaging devices	1	1
Chip / panel model	DC3 DMD	4K UHD HSSI DMD X1, S451
Chip / panel diagonal	0.65 in	0.47 in
Native aspect ratio	16:9	16:9
Native resolution	1920 × 1080	1920 × 1080
Pixel shift	—	XPR 4-way
Addressable resolution	—	3840 × 2160
Optical system description	—	Blue laser phosphor light engine with a yellow phosphor wheel and a colour wheel
Colour wheel segments	6 segment (RGBYCW)	—
Colour wheel speed	2×	—
Optics
Throw ratio	0.69–0.83:1	1.21–1.59:1
Throw reference point	Lens	—
Projection distance table	60″: 0.92–1.1 m · 70″: 1.07–1.29 m · 80″: 1.22–1.47 m · 90″: 1.38–1.65 m · 100″: 1.53–1.84 m · 110″: 1.68–2.02 m · 120″: 1.83–2.21 m · 140″: 2.14–2.57 m · 160″: 2.44–2.94 m · 180″: 2.75–3.31 m	40″: 1.07–1.41 m · 60″: 1.61–2.11 m · 70″: 1.88–2.46 m · 80″: 2.14–2.82 m · 90″: 2.41–3.17 m · 100″: 2.68–3.52 m · 120″: 3.21–4.22 m · 150″: 4.02–5.28 m · 180″: 4.82–6.34 m · 200″: 5.36–7.04 m · 250″: 6.7–8.8 m
Zoom type	Optical	Optical
Zoom ratio	1.2×	1.3×
Focus	Manual	Manual
Vertical lens shift	—	0–10%
Motorized lens shift	—	No
Fixed offset	103%	105%
Focal length	10.2–12.24 mm	12.81–16.74 mm
F-number	2.6–2.78	1.94–2.23
Image size range	60–120 in	34.1–302 in
Vertical keystone	-40–40°	-30–30°
Horizontal keystone	—	-30–30°
Corner / warp correction	—	Warp
Light source
Light source type	Lamp	Laser (phosphor)
Light source detail	—	Laser
Lamp wattage	240 W	—
Light source life	Normal: 4,000 h · Smarteco: 10,000 h · Lampsave: 15,000 h · Eco: 10,000 h	Rated: 30,000 h
Life definition	—	50% brightness
Constant brightness mode	—	Yes
Warm-up time	30 s	—
Cool-down time	90 s	10 s
Light-source dimming	—	Manual steps
Brightness
ANSI lumens	3,000 lm	—
Claimed brightness (non-standard)	—	3,000
Claimed brightness unit	—	Unspecified
Brightness by mode	—	Cinema: 1,194 lm · Hdr sim: 1,684 lm · Game: 1,677 lm · Reference: 1,053 lm · Bright: 2,503 lm · User: 1,909 lmMeasured
Brightness uniformity (centre-to-corner)	—	80%
Contrast & black level
Dynamic contrast	10,000:1	2,500,000:1
Dynamic light control	—	Laser dimming
Colour
Rec.709 gamut	92%	—
Gamut metric	Coverage	—
Gamma / EOTF presets	2.2, 2.4, 2.6	2.2, 2.4, 2.6
Bit depth / 'number of colours'	30 bit	10 bit
Calibration & picture control
Colour management system	6-axis	6-axis
ISF certified	—	Yes
Picture mode memories	2	—
HDR
HDR formats	—	HDR10, HLG
Tone mapping type	—	Adjustable
Motion & gaming
Frame interpolation (MEMC)	—	Yes
Max refresh rate	1920×1080: 60 Hz	1920×1080: 240 Hz · 2560×1440: 120 Hz · 3840×2160: 60 Hz
Input lag (rated)	1920×1080 @ 60 Hz: 16.7 ms	1920×1080 @ 60 Hz: 17 ms · 1920×1080 @ 120 Hz: 8.6 ms · 1920×1080 @ 240 Hz: 4.4 ms · 3840×2160 @ 60 Hz: 16.9 ms
Auto low-latency mode	—	No
Audio
Speaker power	5 W	20 W
Speaker count	1	2
Audio channels	Mono	Stereo
Audio partner	Waves MaxxAudio	—
DTS	—	Yes
Audio outputs	3.5 mm	3.5 mm, Optical, HDMI eARC
HDMI ARC	—	Yes
HDMI eARC	—	Yes
Inputs, control & connectivity
Max input signal	1920 × 1200	4096 × 2160
HDMI port count	2	3
HDMI ports (feature-level)	HDMI 1: HDMI 1.4a; HDMI 2: HDMI 1.4a, HDCP 1.4	HDMI 1: HDMI 2.0, HDCP 2.2, eARC (ENHANCED GAMING LOW LATENCY); HDMI 2: HDMI 2.0, HDCP 2.2; HDMI 3: HDMI 2.0, HDCP 2.2 (PUREMOTION)
Audio input terminals	3.5 mm	—
Horizontal scan frequency	15–102 kHz	15.38–91.15 kHz
Vertical scan frequency	23–120 Hz	24–120 Hz
VGA input	Yes	—
USB media playback	No	Yes
RS-232	Yes	Yes
LAN control	—	Yes
Wired IR input	—	Yes
12 V trigger	—	Yes
Control ecosystem drivers	—	Alexa, Google Home
Wi-Fi	—	Wi-Fi 5
Ethernet	—	Yes
Firmware / software
Smart OS	—	Android (uncertified)
Netflix	—	Native
Storage	—	16 GB
3D
3D support	Yes	Yes
3D sync method	DLP-Link	DLP-Link
3D formats	Top-bottom, Frame sequential, Frame packing, Side-by-side	Frame packing, Side-by-side, Top-bottom, Frame sequential
Glasses included	0	—
Setup automation
Autofocus	None	—
Auto keystone	No	Yes
Acoustic noise
Fan noise (sound pressure)	Typical: 33 dB(A) · Eco: 29 dB(A)	Typical: 27 dB(A) · Max: 29 dB(A)
Environment & power
Operating temperature	0–40°C	0–40°C
Operating humidity	10–90%RH	10–85%RH
Altitude / high-altitude mode	3,000 m	3,000 m
High-altitude mode	Yes	Yes
Operating orientations	Table, Rear, Ceiling	Table, Ceiling, Rear
Rated voltage	100–240 V	100–240 V
Rated frequency	50–60 Hz	50–60 Hz
Power consumption (max)	355 W	230 W
Power consumption by mode	Max: 355 W · Normal: 320 W · Eco: 240 W	Bright 100 pct 110vac: 240 W · Bright 100 pct 220vac: 230 W · Eco 80 pct 110vac: 185 W · Eco 80 pct 220vac: 175 W
Standby power	0.5 W	0.5 W
Physical & installation
Width	296 mm	337 mm
Depth	224 mm	265 mm
Height	120 mm	119 mm
Weight	2.7 kg	4.8 kg
Colours / finishes	—	White
Mount hole pattern	Thread: M4 · Screw length mm: 20–25	—
Safety & compliance
Photobiological risk group	—	RG2
Laser product class	—	Class 1 (IEC 60825-1:2014)
FDA variance	—	Complies with 21 CFR 1040.10 and 1040.11 as a Risk Group 2 LIP; see Laser Notice No. 57, dated May 8, 2019
Safety & market certifications	CE	CE, FCC
Support & ownership
Warranty	🇺🇸 US 3 yr	—
Light-source warranty	US: pre-installed lamp 2,000 hours or one year from purchase, whichever comes first (replacement lamp 90 days or 500 hours)	—
User manual	https://esupportdownload.benq.com/esupport/PROJECTOR/UserManual/TH671ST/TH671ST_UM_EN_230426092526.pdf	https://region-resource.optoma.com/products/import/Documents/c60e8ce7-6032-45ec-a343-21f52fef801c.pdf
In the box
Box contents	Remote, Power cord, Vga cable, Manual, Quick start guide, Lens cap	Power cord, Remote, Batteries, Quick start guide, Wifi dongle
Remote type	IR	Backlit
3D glasses in box	0	—