Optoma ZK451

Brand	Optoma · Professional
Type	Business
Released	June 2026
Resolution	4K UHD
HDR formats	HDR10, HLG
Imaging technology	DLP
Light source	Laser (phosphor)
Brightness	4,500 lm ISO
Throw ratio	1.4–2.24:1
Input lag	1080p: 60 Hz 16.7 ms · 120 Hz 8.6 ms · 4K UHD: 60 Hz 16.7 ms

A compact 4K UHD single-chip DLP laser projector that Optoma rates at 4,500 ISO 21118 lumens, for classrooms, meeting rooms and professional spaces. It has a 1.6x manual zoom with no optical lens shift, two HDMI 2.0 inputs, RS232 and RJ45 control, and a sealed IP6X optical engine.

Data sheet

Picture

White light output	4,500 lm ISO
Brightness uniformity	75%
Imaging technology	DLP
Native aspect	16:9Derived
Addressable resolution	4K UHD (3840 × 2160)
Dynamic contrast	2,000,000:1
Gamma / EOTF presets	2.2, 2.4
HDR formats	HDR10, HLG
Colour management (CMS)	6-axis
3D	Yes
3D formats	Side-by-side, Top-bottom, Frame sequential
3D glasses sync	DLP-Link

Light source

Light source	Laser (phosphor)
Emitter	Blue laser + phosphor
Light-source life	30,000 h eco
Light output control	Steps
Cool-down time	90 s

Optics

Throw ratio	1.4–2.24:1100″ · 3.10–4.96 m
Image size	30–300 in
Projection offset	116%
Zoom	Optical
Zoom ratio	1.6×Derived
Focal length	20.91–32.62 mm
Aperture (f-number)	2.5–3.26
Focus	Manual
Autofocus	No
Vertical keystone	30°
Horizontal keystone	30°
Corner correction	4-corner
Grid warp	Yes
Auto setup	Fit to screen, Obstacle avoidance

Motion & gaming

Input lag

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

Inputs & control

HDMI inputs	2 × HDMI 2.0
Max input resolution	4K UHD
Control ports	RS-232
Control-system drivers	Crestron, AMX

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	2,900 g
Orientations	Table, Ceiling, Rear, Portrait, 360°
Ceiling mount	M4, screws ≥ 10 mm
Dust filter	None
Ingress protection	IP6X (light engine)
Sealed optical engine	Yes

Environment & power

Operating temperature	0–40°C
Altitude	3,048 m
Power draw	Max 178 W · Eco 124 W
Standby	Up to 0.5 W
Power supply	External adapter
Mains input	100–240 V · 50/60 Hz
Fan noise	Max 35 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) ProjectorCentral lists the warranty as 5 years.
User manual	region-resource.optoma.com

In the box

Power cord, Remote, Remote batteries, Quick start guide

Similar models

Model	Resolution	Tech	Lumens	Price
ViewSonic PA700S 800 × 600 · DLP	800 × 600	DLP	4,500	$349	Compare
Epson Pro EX11000 1080p · 3LCD	1080p	3LCD	4,600 +100	$1,299	Compare
Epson PowerLite L265F 1080p · 3LCD	1080p	3LCD	4,600 +100	$1,299	Compare
InFocus ScreenPlay Vista SP2234 1024 × 768 · DLP	1024 × 768	DLP	4,600* +100	$504.51	Compare
Optoma ZH401e 1080p · DLP	1080p	DLP	4,600 +100	$899	Compare
Optoma ZH451 1080p · DLP	1080p	DLP	4,600 +100	—	Compare

Other

Tools

Throw calculator — How far from the screen the ZK451 needs to sit for a given image size, set to its 1.4–2.24:1 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	796435448554
Standard, US	🇺🇸 US	MPN	ZK451