Optoma UHD35STx Review

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Our team recently had the opportunity to extensively test and review the Optoma UHD35STx, a short throw 4K UHD gaming and home entertainment projector. The UHD35STx aims to deliver a superior gaming experience with impressive visuals, low input lag, and high refresh rates. In this review, we will provide an in-depth analysis of the UHD35STx’s performance, covering its display, gaming capabilities, audio, and connectivity. We will also share our critical insights on the areas where the projector could improve. (Check on Amazon)

Optoma UHD35STx Specs Review:

Optoma UHD35STx
Contrast Ratio1,000,000:1
Brightness (Lumens)3,600 ANSI
Input lag4.2 - 16.9ms
Throw Distance1.3' - 10.9'
Screen size33" - 300"
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Display and Image Quality

The UHD35STx boasts an incredible True 4K UHD resolution (3840×2160) through its DLP™ display technology. With a brightness of 3,600 lumens and a contrast ratio of 1,000,000:1, the projector delivers stunningly bright and high-quality images. The native aspect ratio of 16:9 ensures that the visuals are properly displayed without distortion, and the 80% uniformity ensures consistent brightness across the screen.

We tested the projector with various 4K content, including movies, TV shows, and games. The image quality was impressive, offering sharp and detailed visuals. The colors were vibrant and accurate, making the viewing experience truly immersive. However, we noticed that the black levels could be deeper, especially in dark scenes where details might get lost.Optoma UHD35STx

Gaming Performance

The UHD35STx is specifically designed to cater to gamers seeking a competitive edge. The projector supports 1080p 240Hz at 4.2ms and 4K 60Hz at 16.9ms, ensuring lightning-fast input lag and a high refresh rate. We tested the projector with several games at different settings, and the low input lag and high refresh rates were indeed noticeable. The projector provided a smooth and responsive gaming experience, free from the ghosting or motion blur that can sometimes plague other projectors. However, for some fast-paced games, we observed minor input lag at 4K 60Hz.

Short Throw Projection

One of the standout features of the UHD35STx is its short throw projection capability. With a throw ratio of 0.5:1, the projector can create a supersized 100″ image from just a few feet away. We tested this feature in a small room, and we were impressed by how the projector could produce a large, clear image even in a tight space. This makes the UHD35STx an excellent choice for users with limited space or those who want to create an immersive gaming or movie-watching experience without needing a large room.

Audio Performance

The UHD35STx features a built-in 10W speaker, which provides decent audio quality for casual use. However, for a more immersive audio experience, we recommend connecting external speakers or a home theater system through the 3.5mm audio output or the S/PDIF output. The built-in speaker could use improvement in terms of bass response and overall sound clarity, especially at higher volumes.


Optoma UHD35STx connectivity optionsThe UHD35STx offers a variety of connectivity options, including 2 HDMI 2.0 inputs, a 3.5mm audio output, S/PDIF output, and a USB-A power port. There is also an RS232 control port and a 12V trigger for advanced control and integration with home automation systems. The projector is compatible with a wide range of resolutions and devices, including PCs, Macs, and gaming consoles. The inclusion of more HDMI ports would have been a welcome addition for users with multiple devices.


  • Exceptional 4K UHD image quality with bright and vibrant colors
  • Low input lag and high refresh rates for a smooth gaming experience
  • Short throw projection for large images in small spaces
  • Wide range of connectivity options, including HDMI 2.0 and S/PDIF
  • Compatible with various devices and resolutions, including PCs, Macs, and gaming consoles


  • Black levels could be deeper for better contrast in dark scenes
  • Minor input lag observed at 4K 60Hz in fast-paced games


The Optoma UHD35STx is a powerful and versatile projector that delivers stunning 4K visuals, an impressive gaming experience, and the convenience of short throw projection. With a variety of connectivity options and a sleek design, it is perfect for users looking to enhance their home entertainment or gaming setup. However, there are some areas where the projector could improve, such as deeper black levels, reduced input lag at 4K 60Hz, and an enhanced built-in speaker.

In summary, the Optoma UHD35STx is a fantastic choice for users who prioritize image quality, gaming performance, and the flexibility of short throw projection. The projector’s low input lag, high refresh rates, and stunning visuals make it a top contender for gamers and movie enthusiasts alike. However, there are a few areas where it could improve to fully satisfy the most discerning users. Overall, the UHD35STx is a solid investment for anyone looking to elevate their gaming or home entertainment experience. Buy on ProjectorScreen.

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