Optoma Compact 5,000-Lumen 4K UHD Short Throw Laser Projector - ZK521ST-W

Product Details
Optoma ZK521ST-W Compact 5,000-Lumen 4K UHD Short Throw Laser Projector
Future-proofed, sustainable and cost-effective, the Optoma ZK521ST-W is a compact professional short-throw laser projector built for business, education, simulation and commercial environments. Its 5,000-lumen output keeps presentations visible in rooms with ambient light, while True 4K UHD resolution and advanced DLP technology produce sharp, information-rich images. Fine text, data, graphs and imagery remain crisp and readable, whether the projector is supporting a focused meeting or a large presentation. The short-throw optical design also creates an expansive picture where space is limited, helping reduce disruptive presenter shadows in meeting rooms and classrooms.
Optoma DuraCore laser technology is engineered for long-term performance, with consistent brightness and vivid color from a lamp-free light source. Instant on/off functionality gets sessions moving quickly, while reduced power consumption and freedom from routine lamp replacement help lower maintenance demands. With 24/7 capability, this laser business projector is equipped for always-on institutional and commercial applications as well as everyday teaching and collaboration. A built-in 15W speaker supplies integrated presentation audio, and full 3D format support accommodates compatible 3D content and professional workflows.
Installation and administration are streamlined from initial alignment through fleet-wide support. The Optoma Smart Control app turns a mobile device into an intelligent remote for power, source switching, status alerts and screen adjustment.1 Smart alignment tools and geometry controls help installers fit the picture to the available surface, while vertical lens shift, portrait projection and 360-degree operation support varied room layouts. For networked deployments, Optoma Management Suite provides centralized monitoring, diagnosis and configuration through the cloud or a local network, helping IT teams manage multiple displays from one place. Over-the-air firmware delivery further reduces USB-based service work. An energy-efficient, mercury-free light source, a chassis built with over 50% recycled metal and PCR materials, and 100% recyclable packaging round out a design intended to reduce material waste and power consumption.
Key Features
Clear, Shadow-Free Projection for Ambient Light Environments
The 0.79:1 lens can fill the screen from just 5.8 ft away, allowing the projector to sit close to the display surface and leave more usable room for presenters. High light output helps content stand out when a space cannot be fully darkened.
Exceptional 4K Viewing Experience
With up to 8.3 million pixels at 3840x2160 resolution, the DLP imaging system preserves the detail in small type, charts and complex graphics. That clarity helps viewers follow dense presentation material across screen sizes up to 300 in.
Reliable for Long-Term Use with DuraCore Laser
Lamp-free illumination removes recurring bulb changes from the maintenance plan. In Eco mode, the light source is rated for up to 30,000 hours, supporting demanding schedules with fewer service interruptions.
Smart Screen Alignment for Quick Installation
Smart Fit uses the smartphone camera to recognize the screen frame and correct image placement automatically. If an obstacle enters the projection area, Smart Move detects it and relocates the picture to a clear portion of the surface.
Manage, Monitor, and Diagnose - All from One Place
Optoma Management Suite can operate as a cloud-based or local-network display management solution. Its interface brings device status, diagnostics, controls and performance configurations together for 24/7 real-time oversight.
Always Stay Updated
Automatic firmware delivery lets users download updates directly to the projector instead of transferring files with a USB drive. Available releases may add features, improve performance or provide security enhancements while easing IT workload.
Flexible Setup for Any Space
Horizontal and vertical keystone correction at +/-15 degrees can straighten trapezoid-shaped images, while four-corner adjustment lets an installer reshape individual corners. Vertical lens shift, portrait mode and all-around orientation support open additional installation possibilities.
Designed for Sustainability
The mercury-free laser system is paired with a chassis that uses recycled metal and post-consumer recycled materials. FSC-certified paper, recycled and reusable materials, and fully recyclable packaging extend that resource-conscious approach beyond the projector itself.
Features
True 4K UHD DLP Resolution
Resolves text-heavy slides and fine graphics with up to 8.3 million pixels.
5,000-Lumen Brightness
Maintains a clear, presentation-ready image in spaces with ambient light.
0.79:1 Short-Throw Lens
Projects a large picture close to the wall while limiting presenter shadows.
DuraCore Laser
Runs for up to 30,000 hours in Eco mode without replacement lamps.
Tailored Display Modes
Business- and education-focused modes support precise, vibrant DLP color.
Optoma Smart Control App
Handles power, input selection, alerts and alignment from a mobile device.
Smart Fit and Smart Move
Automates screen framing and shifts the picture away from detected obstacles.
Advanced Image Adjustment
H/V keystone and four-corner correction reshape angled or distorted images.
Flexible Installation
Vertical lens shift, portrait support and 360-degree operation expand placement options.
Optoma Management Suite
Centralizes status checks, diagnostics and configuration through cloud or local networking.
Over-the-Air Updates
Downloads projector firmware directly without a USB-based update process.
24/7 Operation
Supports continuous-use deployments in commercial and institutional environments.
Built-In 15W Speaker
Provides integrated audio for presentations without a separate speaker.
Full 3D Format Support
Works with compatible HDMI 1.4a 3D formats and professional content workflows.
Sustainable Construction and Packaging
Uses over 50% recycled metal and PCR materials with 100% recyclable packaging.
Footnotes
1 Optoma Smart Control supports both iOS and Android OS.
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California customers
Proposition 65 WARNING
WARNING: Cancer and Reproductive Harm

Specifications
General
Color
White
Type
Short Throw Projector
Lens Type
Short-Throw
Display Technology
DLP
Resolution
4K
Pixel Resolution
3840 x 2160
Dynamic Contrast Ratio
2,000,000:1
Contrast Ratio
300,000:1
Aspect Ratio
4:3, 16:9, 16:10, Full, Auto, Native
Eco/Low Mode Lamp Life (hours)
30000
Laser Life (hours)
30000
Horizontal Scan Rate
15 ~ 150 KHz
Vertical Scan Rate
24 ~ 240Hz
Brightness (Lumens)
5000
Uniformity
75%
Vertical Lens Shift
104% - 125%
Light Source Type
Laser
Throw Ratio
0.79:1
Vertical Keystone Correction
+/-15 degrees
Projection Distance
0.89m - 2.93m (Optical Travel); 1m - 10m (Mechanism Travel)
Projection Method
360-Degree, Portrait
Projection Lens
Focal Length: 11.6mm
Horizontal Keystone Correction
+/-15 degrees
3D
Yes
Focal Length (mm)
11.6
Number of HDMI Inputs
2
Native Offset
104% - 125%
Input(s)
2 x HDMI 2.0, 1 x VGA In
Output(s)
2 x USB-A 2.0, 1 x 3D Sync Out, 1 x Audio 3.5mm
Security
Security Bar, Kensington Lock, Password Protected Interface
Computer/Component Video
Yes
Composite Video
No
Operating Temperature
32 degrees F to 104 degrees F (0 degrees C to 40 degrees C)
Max Altitude
10,000 ft., For 0 degrees C ~ 15 degrees C
Max Humidity
80% RH, Non-Condensing
Remote Control
Business Remote Control
Speaker(s)
1 x 15W
In the Box
(1) AC Power Cord, (1) Business Remote Control, (2) AAA Batteries, (1) Quick Start User Manual
Projection Technology
DLP
Maximum Projected Screen Size (in)
300
Power Consumption (Standby)
<=0.5W
Power Consumption (Min)
146W
Power Consumption (Max)
196W
Input Lag
16.7ms (4K60), 16.7ms (1080p60), 8.6ms (1080p120)
Noise Level
29 dB
Audio Technology
15W (Mono)
Image Control
1 x RJ45, 1 x RS232, 1 x 12V Trigger
Warranty Information
Labor Warranty
3 Years Limited
Parts Warranty
3 Years Limited
Approximate Weight
Package Weight (lbs)
11
Approximate Dimensions
Package Size HxWxL (in)
12 x 7 x 16