Optoma ZK420UST

Brand	Optoma · Professional
Type	Business
Released	May 2025
Resolution	4K UHD
HDR formats	HDR10, HLG
Imaging technology	DLP
Light source	Laser (phosphor)
Brightness	4,200 lm ANSI
Throw ratio	0.25:1
Input lag	1080p: 60 Hz 17 ms · 120 Hz 8.6 ms · 240 Hz 4.3 ms · 4K UHD: 60 Hz 16.9 ms

A compact 4K UHD ultra short throw laser projector rated at 4,200 ANSI lumens, with a 3840x2160 picture built by four-way pixel shifting. It has a fixed 0.25:1 lens, two HDMI 2.0 inputs, HDBaseT, RS232 and network control, and 360-degree and portrait installation. It suits meeting rooms, classrooms and simulation spaces.

Data sheet

Picture

White light output	4,200 lm ANSI
Brightness uniformity	75%
Imaging technology	DLP
Native aspect	16:9Derived
Pixel shift	XPR 4-way
Addressable resolution	4K UHD (3840 × 2160)
Dynamic contrast	500,000:1
Gamma / EOTF presets	2.2, 2.4
HDR formats	HDR10, HLG
3D	Yes
3D formats	Frame packing, Side-by-side, Top-bottom, Frame sequential
3D glasses sync	DLP-Link

Light source

Light source	Laser (phosphor)
Light-source life	30,000 h eco
Light output control	Steps

Optics

Throw ratio	0.25:1100″ · 0.55 m
Image size	100–150 in
Projection offset	120%
Zoom	None
Focal length	3.7 mm
Aperture (f-number)	2.44
Focus	Manual
Corner correction	4-corner
Grid warp	Yes
Interchangeable lens	No

Motion & gaming

Input lag

1080p: 60 Hz 17 ms · 120 Hz 8.6 ms · 240 Hz 4.3 ms · 4K UHD: 60 Hz 16.9 ms

Low Latency Mode on; keystone and four-corner settings are disabled in this mode

Inputs & control

HDMI inputs	2 × HDMI 2.0
Other video inputs	HDBaseT
Max input resolution	4K UHD
Control ports	RS-232

Smart platform

Ethernet

Yes

Audio

Speaker power	15 W
Speakers	1
Layout	Mono
Audio outputs	3.5 mm, HDMI eARC
HDMI audio return	eARCDerived

Physical & installation

Dimensions (W × D × H)	327 × 328 × 110 mm
Weight	4,200 g
Orientations	Portrait, 360°
Ceiling mount	M4, 10 mm screws
Ingress protection	IP6X

Environment & power

Operating temperature	0–40°C
Operating humidity	10–85%RH
Altitude	3,048 m · high-altitude mode
Power draw	Max 255 W · Eco 180 W
Standby	0.5 W
Power supply	External adapter
Mains input	100–240 V · 50/60 Hz
DC input	24 V
Fan noise	Max 34 dB(A) · Eco 29 dB(A)

Safety & support

Laser class	Class 1
Risk group	RG2
FDA laser notice	Notice 57
Marks	FCC
Warranty	🇺🇸 US 3 yr (light source 5 yr or 12,000 h)

In the box

In the box	Power cord, Power adapter, Remote, Remote batteries, Quick start guide
Remote	IR

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InFocus ScreenPlay Vista SP2234ST 1024 × 768 · DLP	1024 × 768	DLP	4,200*	$594.18	Compare
Optoma W405LVe WXGA · DLP	WXGA	DLP	4,200	$429	Compare
Optoma ZH451ST 1080p · DLP	1080p	DLP	4,200	$1,499	Compare
Optoma ZH450ST 1080p · DLP	1080p	DLP	4,200*	$3,499	Compare
Optoma ZK450 4K UHD · DLP	4K UHD	DLP	4,200*	$5,749	Compare

Other

Tools

Throw calculator — How far from the screen the ZK420UST needs to sit for a given image size, set to its 0.25:1 lens.
Download spec as CSV — Every value on this data sheet with its unit and source, one row per spec.
Download spec as JSON — The same data from the open data API, with variants and identifiers.

Variants & identifiers

Use these to confirm a listing is this exact model. Any of them works at /p/{code}.

Variant	Region	Type	Code
Standard, US	🇺🇸 US	UPC	796435447588
Standard, US	🇺🇸 US	MPN	ZK420UST