Here’s the detailed Optoma UHD51A review. The projector features native UHD quality, HDR10 compatibility, enhanced color mode, versatile connections, and regulation mechanisms. This device creates a high-quality image on a short distance while preserving the sharp detail on the large screen as well.
The high zoom capacity and keystone regulation make up for various installation positions, while the size and weight factor might become an issue in tight spaces. The native sound is quite loud and distinct adding up to the high value of this middle-priced 4K projector.
The Optoma UHD51A has a distinctive design that reminds of other Optoma models while retaining an individual look. The body is black, with the grilled front panel and sides and shiny top panel. The horizontal aluminum strip and the alike lens rim make an individual accent. The device is quite big (5.1-inch tall, 15.4-inch wide, and 11.1-inch deep) and heavy at 11.7 lbs requiring a sturdy mounting stand for the wall or ceiling installation.
The top panel contains the operational buttons and zoom and focus regulating dials (the latter can be hidden under the sliding panel). The backside houses the connection ports (HDMI, USB, VGA, mini-jack, etc.). The remote is a small black bar with the minimum buttons, which are quite tall and intuitive to use.
As can be read in the Optoma UHD51A manual, the projector is equipped with DLP chipset and the 2,400-lumen lamp with the 4,000-15,000 hour resource. The color matrix is based on the DCI-P3 technology and supported by the 6x RGBRGB wheel producing over 1 billion colors. The device is fully compatible with HDR10 and implements the Rec.2020 format.
The resolution is the native 4K representing 8 million pixels simultaneously. The Ultra Detail and Dynamic Black technologies enable the contrast ratio of 500,000:1. The projector also supports the 3D video format.
The projector can create the 30 - 300-inch display at 3.4 - 26.4ft. It has the 1.3x manual and digital zoom and the vertical regulation of the lens and focus.
Connectivity is represented with two 2.1 HDMI ports, three USB type-A ports, the LAN input, audio input and output, the VGA port. The UHD51A is compatible with Alexa and Echo voice command devices.
The speakers produce the stereo sound at 10W. The inner fan noise is rated at 28 dB.
The variety of the picture modes brings flexibility and provides the optimal settings for the different conditions of use (environment light, content played, and consumption). The utmost clarity and color accuracy and saturation are provided in the Cinema mode while the Bright mode can bring some halo around the peaks in the HDR. Both SDR and HDR formats feature a lot of detail and well-textured shades.
The Optoma UHD51A projector is compatible with numerous devices and is easy to set up. The graphic interface is easy to navigate and informative. Hooking up the Alexa or Echo device, you can control the volume, power on and off, input switching, and USB media via the voice commands.
The sound quality is good, with the distinct stereo separation and clear dialogs. The volume can be adjusted quite high to fill the middle-sized room. The integrated fan works quietly becoming slightly louder in the heavy-load Bright and Cinema modes.
The Optoma UHD51A Short Throw Projector is the perfect choice for hassle-free home theater entertainment. This projector supports 4K ultra high definition video with up to 8.3 million distinct pixels, ensuring that images appear vibrant and sharp in any environment. Additionally, it features HDR10 technology which enables enhanced brightness levels of up to 1,500 lumens and a 30,000:1 contrast ratio so you can experience true-to-life color accuracy on your screen or wall without having to move furniture around or worry about glare from ambient light sources. The short throw lens allows users to project large images from very close distances - just 10 inches away! Finally this unit includes two HDMI ports as well as Wi-Fi connectivity for effortless streaming of content directly onto your display surface with no wires required
The Optoma UHD51A Short Throw Projector offers unbeatable performance at a great value. This projector delivers 4K Ultra HD resolution with 8.3 million distinct pixels for an incredibly realistic picture quality and stunning clarity, making it ideal for large venues and home theaters alike. The enhanced contrast ratio of 500,000:1 provides deeper blacks and brighter whites while HDR10 compatibility allows viewers to enjoy vibrant colors that pop off the screen in both dark rooms or well-lit environments. An impressive lamp life of up to 15,000 hours ensures reliable operation over long periods of time without needing replacement lamps or costly maintenance fees down the line—making this model one of the most cost-effective solutions on the market today!
front, rear, ceiling mount, tabletop
Kensington lock, password protection
Composite Video Input (RCA)
Audio Output (3.5mm)
Audio Input (3.5mm)
Audio Input (RCA)
3840 x 2160
Max Resolution (resized)
3840 x 2160
Throw Ratio Range
1.21:1 - 1.59:1
Power Consumption, W
Input Lag, Ms
Projection Distance, M/ft
1 - 8.1/3.4 - 26.4
Noise Level, DBA
Projection Screen Size, Inch
30 - 300
Lamp Life (eco Mode), Hours
Lamp Life (normal Mode), Hours
Lamp Type, W
Keystone Adjustment Horizontal, +- Degrees
Keystone Adjustment Vertical, +- Degrees
Speaker Power, W
vertical +/- 15%
Focal Length, Mm
20.91 - 32.62
2.5 - 3.26
Size W X H X D, сm/inches
39.2 x 28.1 x 12.9/15.4 x 11.1 x 5.1