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Optoma UHD35STx

4K UHD short throw home theater projector

Item # 343UHD35ST

This projector delivers a bright picture on screens up to 300 inches for movies and games on a massive scale.

This projector delivers a bright picture on screens up to 300 inches for movies and games on a massive scale.

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Item # 343UHD35ST

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About the Optoma UHD35STx

Emily S.

Big, bright movie nights

The UHD35STx is a perfect way to enjoy immersive movie nights at home, especially if your room doesn't have the depth required for a long throw projector. This short throw model can give you a 100-inch image from just over a yard away from the screen. It offers a 4K UHD picture and support for HDR (High Dynamic Range) so you get lifelike color and detail on screens up to 300 inches. And it produces 3,600 lumens of brightness, so you can enjoy a vivid picture even in rooms with some ambient light.

Big, bright movie nights

The UHD35STx is a perfect way to enjoy immersive movie nights at home, especially if your room doesn't have the depth required for a long throw projector. This short throw model can give you a 100-inch image from just over a yard away from the screen. It offers a 4K UHD picture and support for HDR (High Dynamic Range) so you get lifelike color and detail on screens up to 300 inches. And it produces 3,600 lumens of brightness, so you can enjoy a vivid picture even in rooms with some ambient light.

Short throw Optoma UHD35STx on a low coffee table several feet from screen

Optoma's UHD35STx is a short throw projector designed to be placed between two and ten feet from the screen.

Gaming on a massive scale

The UHD35STx is a great option for gamers who want to upsize their play area. It has an input response time of 16.9ms for 4K at 60Hz or a lightning fast 4ms for 1080p at 240Hz — great for fast-paced console or PC gaming.

DLP micromirror technology

If you've been to a movie theater in the last twenty years, there's a good chance you've seen a DLP (Digital Light Processing) projector in action. Those professional projectors are massive and expensive, and they feature three DLP imaging chips — one each for the red, green, and blue color primaries.

Most home DLP projectors, including the UHD35STx, use a single DLP chip with a color wheel to reproduce the full color spectrum. The underlying technology sounds like something out of science fiction: DLP chips use millions of tiny mirrors to control the individual pixels that make up the image.

The way it does 4K

To display all the pixels needed for 4K, each frame of video is split horizontally and vertically four ways, and they're displayed very rapidly one after the other, with the pixels shifted diagonally. Your eyes perceive it as a single fluid image containing all of the original detail in the 4K video signal.

Simple setup

The UHD35STx sets up easily on a table, or you can pick up a bracket and ceiling-mount it. Its 4-corner adjustment feature adds flexibility to your installation options.

The projector's built-in speakers can also help facilitate a quick setup. But if you want a little more, use the optical digital audio or minijack audio output to connect to a sound system. It has two HDMI inputs for connecting your high-definition sources.

For the best picture quality from any projector, we recommend using a projector screen.


Product highlights:

    • uses single-chip DLP system with XPR pixel-shifting technology to display true 4K UHD resolution (3840 x 2160)
    • widescreen 16:9 aspect ratio
    • recommended image size: 36" to 300"
    • light output: 3,600 lumens
    • wall color settings adjusts image to compensate for different wall colors
    • ISF modes let you save calibrated settings for day and night viewing
    • 1,00,000:1 contrast ratio
    • HDR-compatible for lifelike texture and detail (HDR10 and HLG)
    • supports 3D content
    Gaming features:
    • enhanced gaming mode with ultra-fast response time
      • 4K at 60Hz with 16.9ms input lag
      • 1080p at 240Hz with 4.2ms input lag
    Image adjustments:
    • 4-corner geometric adjustment helps with off-center placement
    • horizontal keystone correction: +/- 40°
    • vertical keystone correction: +/- 40°
    • 2 HDMI 2.0 inputs
    • 1 USB Type-A port for power/service only
    • 1 stereo minijack audio output
    • RS-232C port for external control of the projector via compatible computer or third-party control device
    • detachable power cord
    • S/PDIF optical digital audio output
    • 12-volt trigger output for controlling a motorized screen
    General features:
    • 240-watt lamp
    • quiet cooling fan (24 dB)
    • built-in speaker (10 watts)
    • backlit remote control
    • projection method: front, rear, upside down
      • can be ceiling-mounted with bracket (sold separately)
    • dimensions: 12-1/2"W x 4-3/4"H x 13-1/4"D (includes allowance for cable connections)
    • weight: 7.7 lbs.
    • warranty: 1 year parts & labor (90 days on lamp)
    • Our 60-day money-back guarantee
    • this projector does not include any type of built-in TV tuner
    • MFR # UHD35STX

    What's in the box:

    • Video projector
    • Lens cap (pre-installed)
    • 6' AC power cord
    • Remote control
    • 2 "AAA" batteries
    • Quick Start User Manual

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    More details on the Optoma UHD35STx

    Stacey B.

    Features & specs

    Native Resolution (pixels) 1920 x 1080
    Resolution with Pixel Shift 4K UHD (8.3 million pixels)
    Picture Size Range 36 to 300 inches
    Display Technology DLP
    3D-Capable Active (emitter built in)
    Aspect Ratio 16:9
    Contrast Ratio 1,000,000:1
    Dynamic Iris No
    Brightness (in ANSI Lumens) 3600
    Mounting Options and Design
    Ceiling Yes
    Tabletop Yes
    Ultra Short Throw No
    Portable Design No
    HDR (High Dynamic Range)
    HDR10 Yes
    HDR10+ No
    HLG Yes
    Dolby Vision No
    Next-gen Gaming Features
    VRR (Variable Refresh Rate) No
    ALLM (Auto Low Latency Mode) No
    4K/120Hz HDMI Inputs None
    eARC No
    Smart TV Features
    Apple TV App ---
    Apple AirPlay 2 ---
    Android TV ---
    Chromecast Built-in ---
    HDMI Inputs 2
    HDMI Version 2.0
    Audio Return Channel No
    Wireless HDMI Input No
    Audio Output 3.5mm, Optical
    USB Media Port ---
    RS-232 Port Yes
    Built-in Speakers Yes
    Wireless Features
    Bluetooth No
    Wi-Fi ---
    Other Info
    Light Source Lamp
    Approximate Lamp Life 4000-10000 hrs
    Bulb Wattage 240
    Vertical Lens Shift No
    Horizontal Lens Shift No
    Vertical Keystone Correction Yes
    Horizontal Keystone Correction Yes
    Fan Noise 24dB(typ)/28dB(max)
    Width (inches) 12-1/2
    Height (inches) 4-3/4
    Depth (inches) 13-1/4
    Weight 7.72 lbs
    Parts Warranty 1 Year
    Labor Warranty 1 Year
    Type of Warranty Service In-home or Carry-in

    Product Research

    Audio/Video Section
    Inputs & Outputs
    Simple Control
    Mounting Options

    Audio/Video Section

    DLP Projector: The Optoma UHD35STx projector incorporates DLP technology from Texas Instruments (TI), which creates razor sharp pictures and amazing videos with incredible colors and brightness, while also providing reliability and longevity. It can be used with 30" to 300" screen sizes.

    • DLP is a reflective technology and can deliver images with both high native ANSI contrast (1,000,000:1) and exceptional brightness (3600 lumens), creating a picture that is natural and life-like.
    • Video and graphics produced by the latest DLP technology are sharper because the mirrors on the DLP chip are so close together that the gaps between pixels in an image are less noticeable. Spaced less than one micron apart, its mirrors create a crisp, detailed image.
    • The inherent speed of DLP technology means that Optoma projector can output video and images at an astonishing rate of 240Hz (1080p), 120Hz (1080p), or 60Hz (4K) for clear and seamless motion.

    XPR 4K Pixel-Shift Technology: Texas Instrument's XPR Technology is a pixel-shifting technology that helps the DLP projector achieve CTA (Consumer Technology Association) approved 4K UHD (3840 x 2160) resolution. XPR Technology utilizes lightning fast pixel-shifting that creates pixels horizontally and vertically to perfectly quadruple the DLP projector's 0.65" DMD 1080p chip and generate 8.3 million distinct pixels on-screen. That's 4x more detail than Full HD 1080p and more than 2x the detail of Epson's 4K Pro UHD technology, which delivers just 4.1 million pixels.

    • 4K UHD Resolution: 4K UHD resolution delivers sharper, life-like images and richer colors - allowing you to sit closer to the screen and enjoy a more immersive experience.
    • 4K UHD Upscale: The Optoma UHD35STx projector will also upscale lower resolution source content to 4K UHD. It will upscale WXGA, 720p, 1080p, WUXGA, and 1440p video resolutions to 4K (3840 x 2160) @ 60Hz.

    Note: The Optoma UHD35STx is not Native 4K. It uses pixel-shifting technology to create a 4K display image from a 1080p DLP chip.

    Amazing Color Technology: Watch your movies, TV shows and play games with stunning colors in any environment. Optoma projectors provide reliable performance suitable for any content and environment. The UHD35STx is capable of reproducing the Rec.709 color gamut, the international HDTV standard to guarantee accurate reproduction of cinematic color exactly as the director intended. It can even produce more saturated colors for a more vibrant looking image, great for gaming and animated movies.

    • BrilliantColor: BrilliantColor technology utilizes a new color-processing algorithm and enhancements to enable higher brightness while providing true, more vibrant colors in picture.
    • CMS (Color Matching System): Its CMS (Color Matching System) displays accurate lifelike colors to best match your viewing content and environment; this unique feature provides you with the flexibility to fine-tune the color settings for optimal precision.

    Dynamic Black Technology: Dynamic Black Technology gives more depth to your image by smoothly adjusting the lamp output, based on the brightness information of each frame. As a result, the Optoma UHD35STx DLP projector can create a stunning high contrast ratio of 1,000,000:1. Bright scenes appear crisp and clear, while dark scenes remain detailed with deep blacks and exceptional light and shade detail.

    HDR Compatible: The Optoma UHD35STx is capable of receiving and displaying HDR content via its HDMI 2.0 input. HDR (High Dynamic Range) enhances the image brightness and contrast for more detail and texture with a greater sense of depth in order to produce a more natural and life like image. The projector is compatible with HDR10 and HLG formats (not compatible with HDR10+ or Dolby Vision). You can choose between 4 HDR Picture Modes to adjust the dynamic range according to the video content or environment.

    • Bright: Choose the Bright Mode for brighter and more saturated colors.
    • Standard: Choose Standard Mode for natural looking colors with a balance of warm and cool tones.
    • Film: Choose Film Mode for improved motion and film-like image.
    • Detail: Choose Detail Mode for improved detail and image sharpness.

    Enhanced Gaming: Enhanced Gaming Mode combined with a fast refresh rate delivers low-latency, fast input response times for 1080p and 4K video; perfect for fast-paced and competitive console or PC gaming. The Game Display Mode provides a visual advantage by boosting shadows and dark scenes for greater visibility of impending obstacles.

    • 1080p HD: 4.0ms @ 240 Hz, 8.6ms @ 120 Hz, or 17.0ms @ 60Hz
    • 4K UHD: 16.7ms @ 60Hz (the projector does not support 4k/120Hz)

    Note: When the Enhanced Gaming Mode is enabled some audio/video settings will be disabled.

    3D-Ready: The Optoma UHD35STx can display 1080p 3D content from almost any 3D source, including 3D Blu-ray players, 3D broadcasting, and the latest generation game consoles. You'll need a pair of Optoma's DLP Link active shutter 3D Glasses (sold separately - not available at Crutchfield). 3D content is available in 720p or 1080p (not 4K).

    Display Modes: You can choose from a variety of factory optimized display mode presets to suit your source content, as well as manually adjust picture settings to suit your personal preference.

    • Reference: This mode is intended to reproduce as close as possible the image the way the movie director intended. Color, color temperature, brightness, contrast and gamma settings are all configured to standard reference levels.
    • HDR/HLG: HDR Mode decodes and displays High Dynamic Range (HDR) content for the deepest blacks, brightest whites, and vivid cinematic color. This mode will be automatically enabled if HDR is set to On and HDR Content is sent to the projector. There is also a dedicated HLG mode for HDR content that uses the Hybrid Log-Gamma format.
    • HDR SIM: This mode is used to enhance non-HDR content with simulated High Dynamic Range (HDR). Choose this mode to enhance gamma, contrast, and color saturation for non-HDR content (720p and 1080p Broadcast/Cable TV, 1080p Blu-ray, non-HDR Games, etc). This mode can only be used with non-HDR content.
    • Cinema: The Cinema Mode provides the best colors for watching movies.
    • Game: Select Game Mode to increase the brightness and response time level for enjoying video games.
    • Bright: The Bright mode offers maximum brightness.
    • 3D: 3D Mode allows you to enjoy a three-dimensional effect from 3D content; 3D active glass are required and sold separately.
    • ISF: ISF allows you to save your calibrated day and night mode settings for the highest possible viewing experience.
    • User: The User Mode allows you to manually adjust the projector's Brightness, Contrast, Sharpness, Color, Tint, Gamma, Color Temperature, Color Space, and RGB.

    Wall Color Adjustment: If you are not going to be using a projection screen and do not have a white wall, you can use the projector's Wall Color adjustment feature. No problem! With the Wall Color setting you can alter the projected image based on the color of your wall. With six options to choose from you can easily adjust for blackboard, light yellow, light green, light blue, pink and grey walls to get the most accurate color gamut.

    Integrated Speaker System: The Optoma UHD35STx is equipped with an integrated speaker system featuring two full-range transducers powered by a 5 watt x 2 channel amplifier.

    Inputs & Outputs

    Dual HDMI 2.0 Inputs: With dual HDMI 2.0 inputs, you can connect your game console, set-top box, laptop, PC, Blu-ray player or media streamer to the Optoma UHD38 DLP projector. You can even turn it into a smart projector by connecting an HDMI dongle like the Google Chromecast, Amazon Fire TV, Apple TV, or Roku stick (sold separately).

    • Video Resolutions: Supported video resolutions include 4K UHD 2160p (24/50/60Hz), 1080p (24/50/60Hz), 1080i (50/60Hz), 720p (50/60Hz), and 480i/p.
    • HDCP 2.2: Both HDMI 2.0 inputs are HDCP 2.2 compliant for playback of copyrighted 4K/HDR material from a Blu-ray player, setup box, media streamer, or game console.
    • Color Depth: Supported color depths include 4:4:4 (8-bit), 4:2:2 (8-bit), and 4:2:0 (8-/10-/12-bit) for 4K @ 60Hz or 30Hz. 4:4:4 (10-/12-bit) and 4:2:2 (10-/12-bit) is also support for 4K @ 30Hz.
    • 24p: Most movies are shot at 24 frames per second (fps). To preserve the purity of the original image, The Optoma DLP projector can accept high definition sources at 24 fps to display movies exactly as the director intended.

    Note: There are no analog composite or component video input

    Analog & Digital Audio Outputs: The Optoma UHD35STx is is outfitted with stereo minijack ( analog audio output and a optical (toslink) digital audio output to connect the projector to an active soundbar, powered speaker, or AV receiver. The optical (toslink) digital audio output supports 2ch PCM and 5.1ch Dolby Digital (not DTS compatible).

    Note: The projector does not support HDMI ARC or eARC.

    USB Power Port: Use the projector's USB-A port (5V/1.5A) to power an HDMI dongle, such as Google Chromecast or Roku Stick (sold separately).

    Remote Management: The UHD35STx offers remote management and custom integration through its RS-232C port and 12V Trigger out.

    • RS-232C Port: The projector offers remote management control through its RS-232C port. The RS-232C connection can be used to control Power, Brightness, Contrast, and other projector settings from your laptop or desktop computer, or a 3rd party remote management system - such as Crestron, Extron, AMX, or PJLink.
    • 12V Trigger Out: The 12V Trigger Out consists a female mono-minijack (3.5mm) which enables control of motorized screens that feature a 12V Trigger Input.

    Detachable AC Power Cord: The Optoma UHD35STx comes with a detachable 6' IEC 3-prong power cord that will need to be plugged into an AC wall outlet; preferably a surge protected AC outlet.

    Simple Control

    Top-Panel: Top-panel controls included Power, Menu, Source, Information, Re-Sync, 4 Directional Select Keys, and Keystone Correction. Also on the top-panel are 3 LEDs that indicate On/Standby, Lamp, and Temperature.

    Backlit Remote: The included IR remote provides wireless operation of the Optoma UHD35STx DLP projector. The remote is designed with subtle white LEDs to light up the buttons, making it to see and operate, especially in the dark. The IR (infrared) control sensor is located on top of the projector. Make sure to hold the remote control at an angle within 30 degrees perpendicular to the projector's top IR remote control sensor to function correctly. The distance between the remote control and the sensor should be no longer than 19'.

    HDMI-CEC: HDMI-CEC (Consumer Electronic Control) enables synchronization of Power On/Off between the UHD35STx and connected HDMI-CEC compatible sources.

    Timers: A Sleep Timer allows you to set the projector to automatically turn off after a predetermined set amount of time (0-180 minutes). The Security Timer lets you set the number of hours the projector can be used; once this time has elapsed you will be requested to enter your password again.

    Auto Power Off: There may be instances when the projector is left running when not in use. To help save energy, the Auto Power Off feature automatically turns off the projector after a set period of time if it is not being used.

    Mounting Options

    Short Throw Lens: The UHD35STx employs a short throw lens that provides convenient placement for a huge screen experience with incredible detail and color. The projector's short lens can project a 36" to a 300" image from a short distance away. The further away the projector is placed from the screen the projected image size increases.

    Screen Size Throw Distance
    40" 15.7"
    50" 21.6"
    60" 26.1"
    80" 34.7"
    90" 39.0"
    100" 43.3"
    120" 51.9"
    150" 64.9"
    180" 78.0"
    200" 86.6"
    250" 108.2"
    300" 130.0"

    Note: Use the Optoma Projection Calculator for further details on throw distance and screen size, as well as to assist you with placement of the projector.

    Image Correction: You can project an evenly rectangular image by placing the projector directly in front of or behind the center of the screen and keeping it level. If you place the projector at an angle to the screen, or tilted up or down, or off to the side, you may need to correct the image shape for the best display quality.

    • Focus & Zoom: To adjust the focus, turn the focus ring clockwise or counterclockwise until the image is sharp and detailed. The projector's electronic zoom can be used to reduce or magnify the image on screen.
    • Image Shift: Image Shift electronically adjusts the projected image position horizontally or vertically (this is not true Lens Shift where the actual lens moves).
    • Four Corner: This setting allows the projected image to be adjusted from each corner to make a square image when the projection surface is not level.
    • Keystone Correction: The projector offers manual and auto keystone correction. Keystone Correction adjusts the image distortion caused by tilting the projector. It has a vertical and horizontal keystone correction of +/- 40 degrees.
    • 3x3 Warp: This setting adjust the image distortion by 9 points of geometric correction.

    Mounting & Placement Options: The projector is designed to be installed in one of four possible positions. It can be tabletop or ceiling mounted in front of or behind your projection screen (ceiling mounting bracket sold separately). The projector should be placed flat on a surface and 90-degrees (perpendicular) to the screen. The projector is equipped with three adjustable feet for adjusting the image height when installing the projector on a tabletop. There are three M4 threaded inserts on the bottom of the projector to attach a ceiling mount bracket (sold separately).

    • The tilt angle of the projector should not exceed 15 degrees, nor should the projector be installed in any way other than the tabletop and ceiling mount, otherwise lamp life could decrease dramatically, and may lead to other unpredictable damages.
    • Allow at least 11.8125" on both the left and right sides of the projector, as well as allow at least 3.9375" above and behind the projector for proper ventilation.

    Note: Your room layout or personal preference will dictate which installation location you select. Take into consideration the size and position of your screen, the location of a suitable power outlet, as well as the location and distance between the projector and the rest of your audio/video equipment.

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