Guide TU650LS Thermal Riflescope: Tested on the Range and in the Field 

Today we're taking a close look at the Guide TU650LS, a high-end thermal riflescope positioned just below the company's flagship lineup. Compared to its predecessor, the new model delivers a significant improvement in thermal sensitivity while retaining the proven platform and feature set. 

Its model designation may seem cryptic at first, but it actually provides a clear description of the optic's key features. 

Following Guide's product naming convention, TU identifies a Series 3.0 thermal riflescope, 6 denotes the 640-pixel sensor, 50 refers to the 50 mm objective lens, L indicates the integrated laser rangefinder, and S designates  the integration of  new ApexVision S1 system architecture. Even before looking at the specifications, the name alone tells you this is a very capable thermal optic. 

The Guide TU650LS Thermal Riflescope 

The TU650LS perfectly reflects the now well-established trend toward designing thermal riflescopes that closely resemble traditional daytime optics in both appearance and handling. It features a standard 30 mm tube, a streamlined objective housing fitted with a spring-loaded flip-up lens cover, three centrally positioned control turrets, a conventional magnification ring at the eyepiece, and a pair of function buttons located just behind it. 

The housing is entirely machined from aluminum alloy and carries an IP68 waterproof rating. 

One of the first things that stands out is the riflescope's sleek, streamlined profile. Unlike many thermal optics equipped with a laser rangefinder, the TU650LS has no bulky external LRF housing to disrupt its clean lines. Instead, the laser rangefinder is fully integrated into the objective assembly. This is made possible by an internally cut objective lens, whose upper section accommodates the laser optics while preserving the appearance and handling of a traditional daytime riflescope. 

The right-side turret serves as the battery compartment, housing a removable rechargeable 18650 Li-Ion battery, which works alongside an internal pack of two permanently integrated 18650 cells. The top turret controls objective focus and also incorporates the power button. The left-side turret combines a push-button confirmation control with a rotary encoder used to navigate the scope's onboard menus. 

Magnification is adjusted exactly as on a conventional riflescope, using a zoom ring located at the eyepiece and fitted with a removable throw lever for rapid operation. Immediately behind it are two additional control buttons that provide quick access to the scope's primary digital functions. 

The TU650LS is supplied with a one-piece quick-detach Picatinny mount, allowing it to be installed on a rifle straight out of the box. 

The accessory package is equally comprehensive. Along with a well-made padded hard carrying case, Guide includes two exposed-terminal 18650 rechargeable batteries, a dual battery charger, a universal wall charger, and USB-C cables for charging and data transfer. 

The supplied mount is well manufactured and uses self-locking quick-release levers with a secondary safety catch. An adjustable recoil lug allows it to be fitted securely to virtually any Picatinny rail commonly found on modern hunting rifles. 

The Guide TU650LS: Technology

The TU650LS is built around Guide's uncooled VOx thermal sensor with Apexcore S1 technology, offering a resolution of 640×512 pixels with a 12 μm pixel pitch, operating in the 8–14 μm spectral range and delivering an outstanding NETD sensitivity of less than 15 mK. The sensor is paired with a 50 mm F0.9 germanium objective lens, providing a native magnification of 3.7x with and 8x digital zoom ratio. 

mage processing is handled by Guide's proprietary ApexVision S1 architecture running on the Nexus 1.0 platform, which delivers three times the processing power of the previous generation while employing the company's Hyper-Light 2.0 algorithm. AI-assisted Hyper-Light 2.0 image optimization produces exceptionally clean, sharp images with optimized contrast, effective noise reduction and virtually no ghosting or image artifacts, all while maintaining a smooth 50 Hz refresh rate. Even at higher digital magnification levels, image quality remains surprisingly usable, preserving an excellent level of detail. 

Fast panning and tracking moving game remain smooth and free of noticeable motion blur, allowing reliable target identification even under demanding conditions. Guide's Shutterless calibration technology also eliminates the brief image freeze associated with conventional thermal sensor recalibration, providing uninterrupted observation. 

The TU650LS incorporates a comprehensive suite of recording and connectivity features. Internal memory provides 256 GB of storage for still images and video recordings, while dual-band Wi-Fi and Bluetooth enable wireless communication with Guide's free TargetIR app, available for both iOS and Android devices. The application includes an integrated ballistic calculator, supports live video streaming directly from the riflescope, allows remote control of several functions and provides convenient management of recorded media. 

The integrated laser rangefinder has a maximum measuring range of 1,200 meters (1,300 yards), while the thermal detection range extends to an impressive 2,600 meters (2,800 yards). 

The eyepiece incorporates a 1.03-inch AMOLED microdisplay with a resolution of 2560×2560 pixels. The viewing area appears slightly oval because the upper and lower portions of the circular image are reserved for the riflescope's status information, including laser rangefinder readings, operating mode, active functions and the charge status of both batteries. 

Guide quotes a battery life of up to 14 hours of continuous operation when both the internal and removable batteries are fully charged. 

Field Test 

For this evaluation, I mounted the TU650LS using the supplied one-piece quick-detach mount on a customized Remington 700 chambered in .308 Winchester, equipped with a 20 MOA MDT scope base and a HERA Arms H7 chassis featuring a folding stock and Ultralight forend. Ammunition consisted of Sako Powerhead Blade lead-free cartridges loaded with 162-grain bullets. Although this configuration may initially appear better suited to a precision rifle, I found it to be an excellent setup for stand hunting, game management and selective culling from supported shooting positions, even at distances well beyond 200 meters (220 yards). 

I evaluated the TU650LS both on the range and under realistic hunting conditions. Zeroing was completed using the scope's convenient one-shot zero function, followed by final confirmation at 100 meters (110 yards) with the Sako ammunition. Accuracy remained excellent out to 300 meters (330 yards). 

The riflescope offers multiple independent zeroing profiles together with a comprehensive selection of reticles. Users can choose from 10 reticle patterns, available in five colors and five brightness levels. Two groups of four reticles feature subtensions calibrated in either MOA or MIL. With the exception of the simple crosshair and dot reticle, all are scalable, effectively behaving like first focal plane reticles throughout the digital zoom range. The riflescope also stores up to 10 independent zero profiles, making it easy to set up different rifles or ammunition loads. 

Thanks to Guide's image enhancement technologies and proprietary processing algorithms, image quality stays excellent even when using digital magnification. At the maximum 8x digital zoom, corresponding to an overall magnification of 29.6x, the image naturally becomes more pixelated, yet it is still entirely usable and retains a remarkable amount of detail. 

Ergonomically, the TU650LS is especially successful where it matters most. The zoom ring with throw lever controlling magnification and the large focus turret are both intuitive and easy to operate, even while wearing gloves. The more advanced functions—which are extensive—require a slightly steeper learning curve to master  because they are distributed between the left-side control turret and the two buttons located on the eyepiece, all with multiple functions depending on the menu context or whether they are pressed briefly or held down. Once learned, however, the interface proves logical and efficient. 

Several frequently used functions are immediately accessible without entering the menu system. For example, the three image palettes can be selected directly by rotating the left-side turret, while a brief press of the power button initiates manual sensor calibration. 

The generous 60 mm eye relief, combined with the supplied rubber eyecup spacer and the wide diopter adjustment range, makes the viewing experience comparable to that of a conventional daytime riflescope. 

Conclusions 

In conclusion, in my opinion the Guide Sensmart TU650LS currently ranks among the best thermal hunting riflescopes on the market in terms of performance for the price. Within Guide's own product lineup, it arguably represents the company's best-balanced offering, combining excellent image quality, advanced features and practical usability in a single package. 

The TU650LS is competitively priced considering its specifications and generous accessory package. The inclusion of a well-made one-piece quick-detach Picatinny mount further enhances its overall value, making it a complete, ready-to-use system straight out of the box. 

Guide TU650LS - Technical Specifications  

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