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Optoma UHD51A 4K UHD Alexa Google Home Projector — main product image
Optoma UHD51A 4K UHD Alexa Google Home Projector
Optoma UHD51A 4K UHD Alexa Google Home Projector
Optoma UHD51A 4K UHD Alexa Google Home Projector
Optoma

Optoma UHD51A 4K UHD Alexa Google Home Projector

★★★★★3.9 (174 reviews)
4KUHDHDRHDR10

Experience true 4K UHD cinema at home with voice-controlled convenience via Alexa and Google Assistant.

$1,499.99*
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*Price sourced from Amazon.com. Last updated:Jun 04, 2026.Price and availability are subject to change.

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Overview

The Optoma UHD51A is a 4K UHD home theater projector built for viewers who want cinematic visuals paired with modern smart home convenience. With true 4K Ultra HD resolution, HDR10 support, and a DCI-P3 wide color gamut, it renders movies, sports, and games with striking clarity and color accuracy. The 500,000:1 contrast ratio ensures deep blacks and well-defined shadow detail, making it particularly effective in darkened rooms where it can showcase its full dynamic range.

What sets the UHD51A apart from many projectors in its class is its native integration with Amazon Alexa and Google Assistant. This allows hands-free control of power, volume, and input switching without reaching for a remote. The 1.3x optical zoom and vertical lens shift provide practical installation flexibility, while HDMI 2.0 with HDCP 2.2 support ensures compatibility with 4K Blu-ray players, game consoles, and streaming devices. With a lamp life rated up to 15,000 hours, the UHD51A is designed to deliver years of use before a replacement is needed.

Key Features

COMPATIBLE WITH ALEXA AND GOOGLE ASSISTANT: With Echo devices or Google Home, take control of the UHD51A with voice commands to power on/off, adjust volume, change inputs, and control USB media playback

TRUE 4K ULTRA HD: Experience high-quality home cinema feel with 4K Ultra HD with 8. 3 million distinct addressable on-screen pixels, enabled by the Texas Instruments 4K UHD DLP chipset

HDR COMPATIBLE: HDR10 technology with DCI-P3 wide color gamut support displays everything in the REC. 2020 colors to match television and film quality; also providing brighter whites, deeper blacks, and greater color depth

ULTRA-SHARP PICTURE: Ultra Detail technology ensures enhanced image sharpness with a higher frame rate to deliver a crystal clear picture

FLEXIBLE INSTALLATION: Whether ceiling mounted or placed on a table, get your picture just right with 1. 3x manual and 0. 8 – 2. 0 digital zoom, 1. 21 – 1. 59, +10% throw ratio, vertical lens shift and keystone correction

4K UHD GAMING-READY WITH HDR: Connect with the latest consoles and gaming PCs for an immersive experience

LONG LAMP LIFE: Enjoy up to 15, 000 hours of lamp life enabling an average of 4 hours of viewing time every day for 10 plus years

ENHANCED COLOR WHEEL: An RGBRGB color wheel increases the color ratio for richer, vivid and cinematic image

FLEXIBLE INSTALLATION: Whether ceiling mounted or placed on a table, get your picture just right with 1. 3x manual and 0. 8 – 2. 0 digital zoom, 1. 21 – 1. 59, +10% throw ratio, vertical lens shift and keystone correction

MORE IMAGE DEPTH: Dynamic Black technology provides more depth to the image by smoothing lamp output to create a high contrast ratio (500, 000: 1); bright scenes appear clear while dark scenes remain detailed

Specifications

Resolution
4K Ultra HD (3840 x 2160)
Brightness
2,400 Lumens
Contrast Ratio
Up to 500,000:1
HDR Support
HDR10, DCI-P3 Wide Color Gamut
Smart Features
Amazon Alexa & Google Assistant
Optical Zoom
1.3x
Digital Zoom
0.8 – 2.0
Lamp Life
Up to 15,000 hours
Connectivity
HDMI 2.0 with HDCP 2.2
Brand
Optoma
Model
UHD51A

Pros & Cons

👍 Pros

  • True 4K UHD resolution with HDR10 and DCI-P3 wide color gamut for vivid, detailed imagery.
  • Built-in Alexa and Google Assistant voice control eliminates the need for a separate smart hub.
  • Up to 500,000:1 contrast ratio delivers deep blacks and excellent shadow detail.
  • Lamp life of up to 15,000 hours keeps long-term operating costs low.
  • 1.3x optical zoom provides flexible installation distance options.

👎 Cons

  • 2,400 lumens brightness may wash out in rooms with significant ambient light.
  • No built-in streaming apps, so a separate media player is still needed for most content sources.
  • Fan noise can be noticeable during quiet scenes at higher brightness settings.
  • Unit is relatively large for a home projector, requiring dedicated shelf or ceiling mount space.

Frequently Asked Questions

Yes, the UHD51A displays true 4K Ultra HD resolution with 8.3 million pixels on screen, delivering sharp and detailed images.
Yes, the UHD51A integrates with Amazon Alexa and Google Assistant, allowing you to power on/off, adjust volume, and switch inputs using voice commands.
The lamp is rated for up to 15,000 hours in eco mode, which significantly reduces replacement frequency compared to standard projector lamps.
Yes, it supports HDR10 and features a DCI-P3 wide color gamut for richer, more lifelike colors when viewing HDR-enabled content.
It includes a 1.3x optical zoom along with 0.8–2.0 digital zoom, giving you flexibility in placement distance without sacrificing image quality.

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