Optoma ZK420UST
- 3840 × 2160 Resolution · 4K UHD
- 4,200 Light output
- 500,000:1 Contrast
- 16:9 Aspect ratio
- DLP Projector type
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Questions about the product?
Whether it's a conference room, school or home cinema – Florian Langkamp, our Projectors and tenders specialist, will advise you personally and prepare an individual quote for you.
Conference room, school or home cinema: we give you personal advice and put together a tailored quote.
Florian LangkampProjectors and tendersspecialist
Description

Optoma ZK420UST
- 0.25:1Throw ratio
- 61–89 cmThrow distance
- 4K UHDResolution · 3840 × 2160
- 4,200ANSI lumens
Optoma ZK420UST 4K UHD ultra short throw projector for professional presentations
If you are looking for a powerful, reliable projection solution for your conference rooms or classrooms, it pays to opt for state-of-the-art laser technology. Choosing the Optoma ZK420UST means effectively solving everyday challenges such as distracting shadows and hard-to-read content in bright environments. This ultra short throw projector combines enormous brightness with intelligent control options so that your presentations always appear in the best light. Discover the right features for your professional AV equipment.
Key benefits of the Optoma ZK420UST at a glance:
- Ultra short throw lens for shadow-free images: Project a 100-inch image from less than half a metre away.
- True 4K UHD resolution for pin-sharp detail: Present complex graphics and text with perfect clarity using 8.3 million pixels.
- High brightness of 4,200 lumens: Ensure excellent legibility even in meeting rooms flooded with daylight.
- Central IT management via OMS Cloud: Monitor and control the projector conveniently and remotely via your network.
Impressive picture quality thanks to advanced laser technology and 4K UHD
Experience a visual performance that makes no compromises, even in brightly lit conference rooms. The Optoma ZK420UST uses a high-quality laser light source to produce a remarkable brightness of 4,200 lumens. Combined with True 4K UHD resolution, the unit projects 8.3 million pixels onto the screen, rendering text, tables and graphics with four times the detail of conventional Full HD models. The projector also supports HDR10 and Hybrid Log Gamma (HLG), enhancing contrast and reproducing colours faithfully. For you, this means you no longer have to darken rooms for presentations. Your audience can take notes and still see the projected content effortlessly. High light output and precise resolution ensure consistently professional, clear presentation results in your working day.

Shadow-free projection thanks to a precise ultra short throw lens
Benefit from flexible room design that puts the presenter centre stage. The built-in ultra short throw lens can create a 100-inch image from a distance of less than 0.5 metres. Being this close to the projection surface effectively prevents people from walking through the light beam during the presentation and casting distracting shadows on the screen. The presenter is also not dazzled by the projector's light. For more complex room situations, the unit offers horizontal keystone correction and a Four Corner Adjustment function. This allows uneven walls or unusual placements to be compensated precisely, so you get a geometrically correct image in any environment. This makes your presentations far more comfortable for the speaker and focuses the audience's full attention on your content.
Reliable continuous operation and seamless network control
Rely on AV technology that fits smoothly into your existing IT infrastructure. Optoma Management Suite (OMS) compatibility allows IT staff to monitor and manage the unit remotely. This makes everyday technical support much easier. Another decisive advantage for installations in large rooms is the HDBaseT 3.0 port, which lets you send uncompressed video and audio signals as well as control commands via a single CAT cable over distances of up to 100 metres without signal loss. The projector is also designed for 24/7 operation and offers an automatic shutdown function to end operation as scheduled when not in use. The proven laser light source with a lifetime of up to 30,000 hours noticeably reduces maintenance compared with conventional lamp projectors. Your IT department gains valuable time for other core tasks.
Why the Optoma ZK420UST is the ideal choice for your educational institutions and meeting rooms
With its ultra short throw lens and precise 4K UHD resolution, the Optoma ZK420UST solves key challenges of modern presentation environments. You benefit from shadow-free presentations, excellent legibility in bright rooms and comprehensive yet simple network control via HDBaseT and OMS Cloud. These well-thought-out features make the unit a valuable, long-lasting addition for demanding professional use. We will be happy to support you on the way to your new AV equipment. Contact us for personal advice by phone or email so that together we can find the perfect solution for your individual requirements.
Technical data
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General
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Condition
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Manufacturer
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Brand
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Model name
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Manufacturer part number
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EAN
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Product type
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ApplicationBusiness projector, Short-throw projector
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FeaturesHDbaseT, HDR, HLG, Integrated speaker
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Image
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Projector type
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Resolution
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Aspect ratio
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ANSI lumens
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Contrast ratio
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Operating hours rating
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Light source
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Light source
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Lamp life
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Projection and lens
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Projection distanceShort throw
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Throw ratio0.25 : 1
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Throw distance61.4 to 89.4 cm
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Lens included in deliveryYes
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Keystone correction horizontal
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Keystone correction vertical
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Connections and wireless
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Inputs1x Ethernet, 1x RS232, 1x USB-A, 2x HDMI
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Outputs1x 3.5 mm jack
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Energy and noise
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Operating noise
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Operating noise (Eco)
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Power consumption in operation
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Dimensions and weight
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Dimensions (W × H × D)32.7 × 10.9 × 32.8 cm
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Weight
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Colour
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Scope of delivery and warranty
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Scope of deliveryPower cable, Quick start guide
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Warranty type
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Documents & downloads
Throw distance calculator – Optimal setup for Optoma ZK420UST
Optimal setup for Optoma ZK420UST
More settings
Aspect ratioLaser TV / ultra short throw: distance is measured from the light exit (slot on top of the device) to the screen. Best placed on a small table or low sideboard directly below the screen.
Borderlinebelow 500 lm/m²
Darkened roomfrom 500 lm/m²
Room with ambient lightfrom 1,000 lm/m²
Bright roomfrom 1,500 lm/m²
Borderline: at this image size the picture looks flat and low in contrast even in a darkened room – better to choose a smaller image.
Reviews
Product safety information
Manufacturer
Optoma
EU responsible person
Optoma Deutschland GmbHAm Nordpark 3
41069 Mönchengladbach
Germany
Contact
E-Mail: info@optoma.de









