Optoma 4K UHD Home Theatre Projector (UHD51A)

Model Number: UHD51A
Web Code: 12908152


Exceptional 4K UHD visuals take gaming and multimedia entertainment to another level with this Optoma home theatre projector. With XPR technology, compatible content is amazingly crisp and clear while boosted by HDR10 compatibility for an expansive array of colours for realistic reproduction. Dual HDMI inputs connect peripheral devices with ease.
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  • Features 2400 ANSI lumens of white and colour brightness, 16:9 aspect ratio, and XPR technology that produces UHD 4K 3840 x 2160 on-screen image resolution
  • With 500,000:1 dynamic contrast ratio, even the darkest areas are exceptionally detailed
  • HDR10 compatibility delivers a wide spectrum of colours for exceptionally realistic visuals
  • DLP light source display technology gives you sharper images without a filter and a better response time
  • 15,000 hours of lamp light life
  • Dual HDMI inputs with MHL support allows you to connect your gaming console, Blu-ray player, or cable/satellite box
  • Also includes analog audio output, 1 x 15-pin VGA, Ethernet Lan, 9PIN RS232 control in, 12 VDC trigger out
  • Includes a 1.3x zoom and boasts a 1.21 to 1.59:1 throw ratio distance
  • Dual built-in 5W speakers handles audio without the need for external speakers
  • Wireless USB adapter allows voice control commands through your Amazon Alexa-enabled devices
  • IR remote provides traditional control options
Home Theatre Projector

Video Features

Display Technology
4K Ultra HD
Native Resolution (Pixels)
3840 x 2160
Potential Screen Size
34.1 - 140 in
Maximum Screen Size
302.4 in
Aspect Ratio
Throw Ratio
1.21 - 1.59:1
Focusing Distance
2.5 - 3.26 m
Dynamic Contrast Ratio
Colour Depth
3840 x 2160 @ 30 Hz: Yuv 4:4:4 (8Bit; 10Bit; 12Bit); Yuv 4:2:2 (8Bit; 10Bit; 12Bit); Yuv 4:2:0 (8Bit; 10Bit; 12Bit) 3840 x 2160 @ 60 Hz: Yuv 4:4:4 (8Bit); Yuv 4:2:2 (8Bit); Yuv 4:2:0 (8Bit; 10Bit; 12Bit)
White Brightness
2400 lm
Colour Brightness
2400 lm
F Number
2.5 - 3.26

Audio Features

Integrated Speakers

Lamp Features

Approximate Lamp Lifetime
15000 Hours
Lamp Warranty
90 Days

Convenience Features

Mounting Bracket
Mounting Bracket Style
Inverted Operation Compatible
3D Video Support


HDMI Inputs
Component Video Inputs
PC VGA Inputs
1 x 15-pin VGA
USB Connection
Other Inputs
Ethernet Lan; 9PIN RS232 Control In; 12 VDC Trigger Out

Unit Features

Operational Decibel Level
28 dB (High Brightness); 25 dB (Low Brightness)
Unit Colour
Power Consumption
348 W
On-Body Controls


38.4 cm
13 cm
28.2 cm
Width (Inches)
15.1 in
Height (Inches)
5.1 in
Depth (Inches)
11.1 in
5.3 kg
  • 1 x Optoma Technology UHD51A HDR XPR UHD DLP Home Theater Projector
  • 1 x Remote Control With Batteries
  • 1 x Lens Cap
  • 1 x HDMI Cable
  • 1 x Wireless USB Adapter For Alexa Or Screen Mirroring
  • 1 x Power Cord

  • Awesome picture
    by Justbeinghonest

    on June 19, 2019

    I originally purchased the UHD50 and I wasn't blown away. I returned it and swapped for the UHD50A and I'm well pleased. The picture quality is much more defined, consistent, and worth every dollar. Unfortunately, I haven't been able to connect to Alexa which comes with the projector. It's difficult at this point. I connected the firecube which gives a much better picture than the firestick and has the built in Alexa which serves the same purpose so it's fine. Also, this shows well during the day which was to my surprise being that we don't have any blackout curtains up just yet. I love it!

    Review originally posted on bestbuy.com

  • Awesome projector
    by Hodgie

    on May 31, 2019

    For the cost, this is a great projector. I have ceiling mounted it, and it works well. I wish it had a keystone to allow more offset onto the screen, but I have gotten used to a higher picture. Fan sound is much quieter than my old projector. Only issue I have is there is a bit too much red in faces, but I am sure that is just picture tuning.

    Review originally posted on bestbuy.com

  • V. Good 4k but sound issues
    by Kots

    on January 22, 2019

    Its a very good projector for dark room projection and 4k clarity and color accuracy. Placement needs to be accurate in center of screen for lack of adjustment. One of the reason i bought this over benq 2550 was its capability to return sound stream via optical output. But realized later after buying and trying a lot that sound output is only 2 channel. So i can stream 4k via roku plugged to projector but cannot get 5.1 or 7.1 to my hometheatre. And same applies to anything playing directly on projector. Wish it could return atleast 5.1. Found ways around to make things work but would have not spent extra over benq 2550 if I had known sound issues. With sound field leveled this and benq seems similar in picture quality just the later at lower price.

    Review originally posted on bestbuy.com

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