Optoma ZK521ST 4K UHD Short Throw Laser Projector
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Optoma ZK521ST
Compact 4K UHD Short Throw Laser Projector, 5,000 Lumens
The Optoma ZK521ST puts a true 4K UHD (3840 × 2160) picture on a big screen from a short distance. Its 0.79:1 short-throw lens fills a screen of up to 300" from just 5.8 feet away, so you get a large, shadow-free image even in a smaller room, boardroom or classroom.
With 5,000 lumens, a DuraCore laser rated for up to 30,000 hours (Eco mode) and 24/7 operation, it is built for reliable, low-maintenance use, with central management through Optoma Management Suite and control from your phone with the Optoma Smart Control app.
Description
True 4K UHD
Up to 8.3 million pixels of 4K UHD (3840 × 2160) resolution from DLP technology, so even small text and detailed graphs stay sharp and easy to read.
Big Pictures From Tight Spaces
The 0.79:1 short-throw lens fills the screen from just 5.8 feet away, with screen sizes from 30" to 300". The short-throw design reduces shadows, even in limited spaces.
5,000 Lumens for Rooms With Light
High brightness keeps the picture clear in rooms with ambient light, ideal for meetings, classrooms and commercial spaces.
DuraCore Laser
The mercury-free DuraCore laser gives consistent brightness and colour for up to 30,000 hours (Eco mode), with instant on/off, lower power use and no lamps to replace.
Optoma Smart Control App
Set up and run the projector from your iOS or Android phone: power on/off, input switching and status alerts, plus screen alignment with Smart Fit, which uses your phone’s camera to detect the screen frame and correct the image automatically.
Optoma Management Suite
Monitor, diagnose and control your displays from one place, in the cloud or on your local network, with 24/7 real-time status.
Over-the-Air Updates
Firmware updates download over the network, with no USB drive needed, keeping the projector up to date with new features and improvements.
Flexible Installation
±15° horizontal and vertical keystone correction, four-corner adjustment and vertical lens shift, with support for 360° and portrait-mode projection.
Designed for Sustainability
Built with over 50% recycled metal and PCR materials, with a mercury-free laser and 100% recyclable packaging.
Specifications
| Display | |
| Technology | DLP® |
| Resolution | 4K UHD (3840 x 2160) |
| Brightness | 5,000 lumens |
| Contrast Ratio | 300,000:1 |
| Contrast Ratio (Dynamic) | 2,000,000:1 |
| Native Aspect Ratio | 16:9 |
| Compatible Aspect Ratios | 4:3, 16:9, 16:10, Full, Auto, Native |
| Keystone Correction | Horizontal ±15°, vertical ±15° |
| Horizontal Scan Rate | 15 – 150 kHz |
| Vertical Scan Rate | 24 – 240 Hz |
| Uniformity | 75% |
| Screen Size | 30" – 300" |
| Light Source | |
| Light Source Type | Laser |
| Light Source Life | 30,000 hours (Eco mode) |
| Optical | |
| Throw Ratio | 0.79 |
| Projection Distance | 1 m – 10 m (mechanism travel); 0.89 m – 2.93 m (optical travel) |
| Zoom | n/a |
| Focal Length | 11.6 mm |
| Native Offset | 104% – 125% |
| Lens Shift | Vertical 104% – 125% |
| Connectivity | |
| Inputs | 2 x HDMI 2.0, 1 x VGA In |
| Outputs | 2 x USB-A 2.0, 1 x 3D sync out, 1 x Audio 3.5 mm |
| Control | 1 x RJ45, 1 x RS232, 1 x 12V trigger |
| Networking | |
| LAN Control | Yes |
| Audio | |
| Speaker | 1 x 15W |
| General | |
| Noise Level | 29 dB(A) (min and max) |
| Input Lag | 4K/60Hz: 16.7 ms · 1080p/60Hz: 16.7 ms · 1080p/120Hz: 8.6 ms |
| PC Compatibility | VGA, SVGA, XGA, 720p, WXGA, SXGA, SXGA+, UXGA, 1080p, WUXGA |
| 2D Compatibility | NTSC, PAL, SECAM, SDTV, HDTV, UHD |
| 3D Compatibility | Supports all HDMI 1.4a mandatory 3D formats (frame pack, side-by-side, top-bottom); up-converts frame rate from 60Hz to 120Hz or 24Hz to 144Hz |
| 24/7 Operation | Yes |
| 360° Operation | Yes |
| Security | Security bar, Kensington Lock, password-protected interface |
| OSD Languages | 27 languages: Arabic, Czech, Danish, Dutch, English, Farsi, Finnish, French, German, Greek, Hungarian, Indonesian, Italian, Japanese, Korean, Norwegian, Polish, Portuguese, Romanian, Russian, Simplified Chinese, Spanish, Swedish, Thai, Traditional Chinese, Turkish, Vietnamese |
| Operating Conditions | 0 – 40°C (tolerance ±2°C); max altitude 10,000 ft (for 0°C – 15°C); max humidity 80% RH, non-condensing |
| Remote Control | Business remote control |
| In the Box | AC power cord, remote control, 2 x AAA batteries, quick start user manual |
| Software | |
| Optoma Management Suite | Yes |
| Optoma Smart Control App | Yes |
| Power | |
| Power Supply | AC 100 – 240 V, 50 – 60 Hz |
| Standby Power | ≤0.5 W |
| Power Consumption (Eco Mode) | 147 W @ 110VAC; 146 W @ 220VAC |
| Power Consumption (Bright Mode) | 196 W @ 110VAC; 193 W @ 220VAC |
| Dimensions & Weight | |
| Dimensions (W × D × H) | Without feet: 216 × 274 × 108.5 mm; with feet: 216 × 274 × 114 mm |
| Net Weight | 3.0 kg |
| Gross Weight | 4.3 kg |
Caring for your Speakers and Amplifiers
To Keep your equipment safe these are some best practices to note. Please be advised that this is only to reduce the risk of misuse and is not an exhaustive list.
Speakers
- Speaker terminals are marked red and black, ensure your amplifier to the speakers are wired on the same colours
- Ensure no loose speaker wire from the red touches a loose wire from the black as this will lead to a short circuit and damage either the speaker, the amplifier or both.
- Not all speakers are designed to play at max volume, kindly consider the pairing of your amplifier and speakers
- Speaker cabinets cannot be replaced please handle with care.
AV & Stereo Amplifiers
- If your amplifier has HDMI ports, ensure all devices are off before plugging in the HDMI cable
- Turn off the amplifier before swoping out or adding speaker cable
- Amplifiers generate heat, place them in a well ventilated space. if possible avoid having anything on top of the unit.
- adding a surge protector can assist with power dips which are likely to damage your devices. Isotek and Furman are industry standard.
- Dusty environments can sometimes lead to accumulation of dust in the electronic components that might affect heat regulation
Shipping & Returns
- Free shipping on orders over R500 within the country.
- Standard delivery within 2–5 business days. Delays will be communicated. This might vary slightly depending on your location.
- Return items in original condition for a full refund. (unopened state)
- Returns that are open/unboxed will be subject to a handling fee. Refunds will only be processed after testing the unit.