Pulsar Symbion LRF DXT50 vs DXR50: Thermal + 4K Binoculars

The Pulsar Symbion LRF is a multispectral binocular: a thermal imaging channel and a 4K digital channel in one two-eyed housing, with a 1500 m laser rangefinder. Thermal finds animals by their heat in darkness, fog, and cover. The digital channel then shows them in full color by day, or lit by the built-in infrared illuminator at night, so you can read markings, antlers, and body detail that a thermal image flattens out.

Pulsar sells it in two models. The DXT50 carries a 1280x1024 thermal sensor for the widest, most detailed thermal view; the DXR50 carries a 640x480 sensor with more magnification and longer runtime. Everything else, including the digital channel, the rangefinder, the display, and the housing, is shared.

Choose the Symbion DXT50 to scan wide and the DXR50 to reach far on thermal. Their thermal channels put the same detail on each degree of view: 1,280 pixels across 17.5 degrees and 640 pixels across 8.8 degrees both work out to about 73 pixels per degree. So at a given magnification the DXT50 does not show an animal sharper than the DXR50; it shows twice as much ground around it, which means fewer sweeps across a field and less chance of missing an animal between passes.

The DXR50 spends that difference on reach and endurance. Its thermal zoom starts at 4x and runs to 32x, its system NETD is slightly lower (below 18 mK versus below 20 mK), and its lower-resolution core draws less power: up to 10 hours against 8. For open fields and big clearings, the DXT50's width pays off. For glassing a far tree line from one stand all night, the DXR50 does the job for less money.

The Symbion's digital channel is a 4K (3840x2160) CMOS sensor behind a 50mm F1.8 lens, zooming from 6.5x to 26x with a 5.8-degree field of view at the low end. In daylight and twilight it shows full color. After dark it switches to night viewing, lit by a focusable 850 nm infrared illuminator with three power levels. The digital view is the identification channel: narrower than the thermal view, but it shows the color, markings, and texture that tell one animal from another.

Picture-in-picture modes combine the two, for example a thermal window over the full-screen digital view, so a heat signature picked up on thermal can be confirmed in color or under IR without lowering the binocular. Electronic image stabilization steadies the view at high magnification, and three sensitivity amplification levels tune the thermal image to conditions. Our thermal sensor cutaway explains why a thermal image shows shape and heat but not color.

Both Symbion models range to 1500 m at plus or minus 1 m with a 905 nm Class 1 laser, in single-shot or scan mode, and show true horizontal distance for angled shots. That is 300 m more than the 1200 m rangefinders in Pulsar's TELOS LRF XT50 monocular and Thermion 3 riflescopes. An integrated ballistic calculator works with profiles from the Stream Vision Ballistics app, so the binocular hands you the range and the holdover together before you move to the rifle.

The Symbion is built for one-hand use, with dual focus wheels and controls laid out for either hand, a three-position power switch, and haptic feedback on the buttons. The magnesium alloy housing is IP67 rated, operates from -25 to +50 C, measures 207 x 132 x 72 mm, and weighs 1 kg with batteries. A 1/4 inch socket and an ARCA-Swiss-compatible tripod adapter put it on a tripod for long glassing sessions.

Power comes from two external APS5 packs, rated for up to 8 hours on the DXT50 and 10 hours on the DXR50, with 5 V or 9 V USB-C external power for longer sits. Video and photos record to 64 GB of memory at 1440x1080, and the Stream Vision 2 app streams live footage over 2.4/5 GHz Wi-Fi. A 1920x1080 AMOLED display sits behind 13 mm of eye relief with plus or minus 5 diopters of adjustment.

The Symbion DXT50's thermal channel matches Pulsar's TELOS LRF XT50 monocular: the same 1280x1024 sensor behind a 50mm F1.0 lens with a 17.5-degree view and a 2300 m detection rating. The Symbion adds the 4K color and IR digital channel, a longer 1500 m rangefinder, and two-eyed viewing that is easier on long sessions. The TELOS keeps the size advantage at 0.73 kg against 1 kg. If you only scan for heat, the TELOS covers it; if you want to identify in color or under IR on the same device, the Symbion is the one.

Our TELOS LRF XT50 coverage breaks down the monocular, and the thermal monocular buying guide ranks it against other handheld scanners.

Pulsar TELOS LRF XT50

Thermal-only scanning and ranging in a lighter handheld

$4,499.97

Flagship handheld thermal with a 1280x1024 sensor, wide scan view, and integrated laser rangefinder

Monocular1280x10241200 m LRF

RIFLECONFIG7%+ off at checkout

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The Symbion is for hunters and land managers who glass at dawn, dusk, and through the night and want one device for finding and identifying. Thermal picks up the animal in cover or darkness; the digital channel confirms species, sex, and age in color or under IR; the rangefinder gives the distance. It also suits wildlife observers, search and rescue teams, and security work, where the color channel helps with identification that thermal alone cannot settle.

It is an observation device, not a rifle optic. Pair it with a thermal riflescope such as the Pulsar Thermion 3 LRF or another pick from our best thermal scope guide. For daytime-only glassing, a quality optical binocular from our hunting binocular guide does the job for a fraction of the price. Night hunting rules vary by state, species, and season, so check local regulations before you hunt with thermal or IR after dark.

The Pulsar Symbion LRF DXT50 (SKU PL77456) lists at $7,999.97 and the Symbion LRF DXR50 (SKU PL77458) at $5,999.97 from US retailers. Both include the 1500 m rangefinder, the 850 nm IR illuminator, and the 4K digital channel.