Optoma ZK521ST

Brand	Optoma · DuraCore laser
Type	Business
Released	June 2026
Resolution	4K UHD
Imaging technology	DLP
Light source	Laser (phosphor)
Brightness	5,000 lm ISO
Throw ratio	0.79:1
Input lag	1080p: 60 Hz 16.7 ms · 120 Hz 8.6 ms · 4K UHD: 60 Hz 16.7 ms

A compact 4K UHD short-throw laser projector for classrooms, meeting rooms and commercial spaces. It has a fixed 0.79:1 lens with vertical lens shift, a 5,000-lumen ISO 21118 rating, a 30,000-hour laser source and two HDMI 2.0 inputs.

Data sheet

Picture

White light output	5,000 lm ISO
Brightness uniformity	75%
Imaging technology	DLP
Native aspect	16:9Derived
Addressable resolution	4K UHD (3840 × 2160)
Dynamic contrast	2,000,000:1
3D	Yes
3D formats	Frame packing, Side-by-side, Top-bottom

Light source

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

Optics

Throw ratio	0.79:1100″ · 1.75 m
Image size	30–300 in
Projection offset	104%
Zoom	None
Focal length	11.6 mm
Focus	Manual
Vertical lens shift	0–21%
Vertical keystone	15°
Horizontal keystone	15°
Corner correction	4-corner

Motion & gaming

Input lag

1080p: 60 Hz 16.7 ms · 120 Hz 8.6 ms · 4K UHD: 60 Hz 16.7 ms

Mode not stated on the spec page; the manual ties 8.6 ms at 1080p/120 to Low Latency Mode, which disables keystone and corner correction

Inputs & control

HDMI inputs	2 × HDMI 2.0
Other video inputs	VGA
Audio inputs	3.5 mm
Control ports	RS-232, 12 V trigger

Smart platform

Ethernet

Yes

Audio

Speaker power	15 W
Speakers	1
Audio outputs	3.5 mm
HDMI audio return	NoneDerived

Physical & installation

Dimensions (W × D × H)	274 × 216 × 114 mm
Weight	3,000 g
Colours	White
Orientations	Portrait, 360°
Ingress protection	IP6X

Environment & power

Operating temperature	0–40°C
Altitude	3,048 m
Power draw	Max 196 W · Eco 147 W
Standby	Up to 0.5 W
Mains input	100–240 V · 50/60 Hz
Fan noise	Max 29 dB(A) · Eco 29 dB(A)

Safety & support

Laser class	Class 1
Risk group	RG2
Hazard distance	1 m
FDA laser notice	Notice 57
Marks	FCC
Warranty	🇺🇸 US 3 yr (light source 5 yr or 12,000 h) From the product page; Optoma's US warranty page was not read. ProjectorCentral lists the warranty as 5 years.
User manual	region-resource.optoma.com

In the box

Power cord, Remote, Remote batteries, User manual

Similar models

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BenQ LH750 1080p · DLP	1080p	DLP	5,000	$1,399 −$1,300	Compare
Epson PowerLite 815E 1080p · 3LCD	1080p	3LCD	5,000	$3,662 +$963	Compare
Optoma ZH462 1080p · DLP	1080p	DLP	5,000*	$2,399 −$300	Compare
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Other

Tools

Throw calculator — How far from the screen the ZK521ST needs to sit for a given image size, set to its 0.79:1 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
White, US	🇺🇸 US	UPC	796435448431
White, US	🇺🇸 US	MPN	ZK521ST