Fujinon 25x150 MT-SX Binoculars (without Mount)

Fujinon 25x150 MT-SX High-Power Waterproof Binoculars – 25x Magnification, 150mm Objective, EBC Multi-Coated Optics

The Fujinon 25x150 MT-SX Binoculars (without Mount) represent the pinnacle of long-range optical engineering, built for professionals and enthusiasts who demand extraordinary performance in astronomy, marine observation, or surveillance. The binoculars’ commanding 25x magnification and massive 150mm objective lenses deliver a breathtaking viewing experience, capturing an abundance of light even in the faintest twilight. Each lens surface is fully multi-coated with Fujinon’s proprietary EBC (Electron Beam Coating)—a technology renowned for maximizing light transmission, enhancing contrast, and maintaining accurate color fidelity across the entire visible spectrum. With an apparent field of view of 67° and a true field of 2.7°, the MT-SX offers an expansive yet detailed panorama that feels natural and immersive, ideal for both terrestrial and celestial observation. Every glance reveals rich depth, pinpoint clarity, and edge-to-edge sharpness that few binoculars in the world can rival.

Constructed with precision-engineered Porro prisms and BaK-4 optical glass, these binoculars ensure perfect image alignment and outstanding light efficiency. Each eyepiece uses an individual focus (IF) mechanism, allowing precise adjustments for each eye—critical for extended observation sessions or when multiple users share the instrument. The 18mm long eye relief offers comfort even during prolonged use, accommodating eyeglass wearers without compromising the field of view. A 6mm exit pupil ensures bright images under low-light conditions, while the interpupillary distance range of 60–70mm provides adaptability for users of different preferences. Designed to perform in harsh environments, the MT-SX features a sealed, waterproof, and corrosion-resistant aluminum housing engineered for durability and reliability under extreme outdoor conditions—be it salt air, coastal humidity, or the temperature swings of an observatory dome. Fujinon’s meticulous craftsmanship guarantees that this optical powerhouse will remain a steadfast instrument for years of professional use.

Beyond raw optical prowess, the Fujinon 25x150 MT-SX is built with practical versatility. Its individual eyepiece filter compatibility allows users to attach Fujinon’s Polaris filters—polarizing, haze, nebula, or neutral density—for optimized performance in different lighting or atmospheric conditions. This adaptability transforms the MT-SX into an all-season, all-purpose tool for professionals in fields ranging from maritime navigation and border patrol to scientific research and stargazing. The rugged chassis not only withstands the elements but also maintains precise optical alignment, ensuring consistent performance even after years of exposure or handling. With dimensions of approximately 36.6 × 19.3 × 96.3 cm (14.4 × 7.6 × 37.9 inches) and a weight of around 19.5 kg (43 lb), these binoculars embody stability and permanence—best suited for fixed-mount installations on Fujinon’s dedicated tripod system, which is available separately.

Every technical aspect has been refined to deliver professional-grade performance. The high-transmission EBC coatings, anti-reflective optical path, and superior mechanical precision result in extraordinary image brightness and contrast, making distant subjects appear vivid and dimensional. Whether tracking ships on the horizon, observing wildlife across great distances, or studying celestial bodies with astonishing clarity, the MT-SX transforms every viewing experience into an event of precision and awe. The Fujinon 25x150 MT-SX also provides peace of mind through its weatherproof design, ensuring fog-free operation and corrosion resistance in marine or desert environments. The metal body and robust optical mounts are built for lifetime endurance, meeting the standards of coast guards, research stations, and observatories worldwide.

In the competitive landscape of high-powered observation instruments, the Fujinon 25x150 MT-SX stands apart as the ultimate fusion of performance, reliability, and optical brilliance. Unlike ordinary binoculars that compromise on aperture or clarity, this model delivers a professional-grade combination of wide-angle viewing, ultra-bright optics, and mechanical integrity that surpasses conventional expectations. Backed by Fujinon’s legendary Japanese manufacturing precision and decades of optical innovation, it’s more than just a tool—it’s an investment in excellence. For those who refuse to settle for less than the clearest, brightest, and most durable long-range viewing system available, the Fujinon 25x150 MT-SX Binoculars are the definitive choice. Whether mounted on a fixed installation for coastal monitoring or positioned in an observatory for deep-sky exploration, they promise unmatched image quality and reliability, making them the gold standard for professionals and enthusiasts alike.

Features:

Massive 150mm Objective Lenses for Exceptional Light Gathering

The Fujinon 25x150 MT-SX Binoculars feature enormous 150mm objective lenses—a specification rarely found in the binocular world. This large aperture dramatically increases light intake, resulting in brighter, more detailed images even in near-dark or low-contrast conditions. Whether you’re observing distant ships at dawn or scanning celestial objects at night, these lenses ensure unparalleled brightness and clarity. The superior light-gathering power also enhances image contrast and depth perception, allowing users to see fine textures and subtle differences that smaller optics simply can’t reveal.

Powerful 25x Magnification for Long-Range Observation

With an impressive 25x magnification, the Fujinon 25x150 MT-SX brings distant subjects dramatically closer without compromising optical integrity. Unlike consumer-grade binoculars that lose sharpness or brightness at high zoom levels, this model maintains crystal-clear resolution across the full field of view. This magnification level is ideal for professionals in surveillance, maritime navigation, and astronomy—offering both reach and precision for spotting even the smallest details miles away.

Fully Multi-Coated EBC Optics for Maximum Clarity and Transmission

Each lens and prism surface in the MT-SX series is treated with Fujinon’s proprietary Electron Beam Coating (EBC)—a multi-layer process that optimizes light transmission and virtually eliminates glare, ghosting, and chromatic aberration. These advanced coatings enhance contrast, ensure true-to-life color rendition, and maintain exceptional brightness even under challenging light conditions. The result is superior optical clarity and fidelity, ensuring every scene appears vivid, sharp, and distortion-free.

Wide 67° Apparent Field of View for Immersive Observation

The binoculars provide a 2.7° true field of view with a 67° apparent angle, giving users a panoramic, natural viewing experience. This wide field allows for easier tracking of moving subjects—such as aircraft, wildlife, or marine vessels—and provides a more immersive feel for stargazing. Unlike narrow-field optics that restrict your perspective, the MT-SX keeps both depth and width in perfect balance, allowing your eyes to move comfortably through vast distances without strain.

Individual Focus (IF) System for Precision and Stability

Designed with an Individual Focus (IF) mechanism, the Fujinon 25x150 MT-SX lets each eyepiece focus independently for maximum accuracy. Once set, the focus remains stable even when observing subjects at varying distances, eliminating the need for constant adjustment. This system is preferred in professional and military-grade optics for its reliability, precision, and ability to maintain focus integrity over long observation sessions—ideal for fixed installations or scientific applications.

Long 18mm Eye Relief for Comfort and Accessibility

With a generous 18mm eye relief, these binoculars accommodate eyeglass wearers and reduce eye fatigue during extended use. This feature ensures that users can maintain a full field of view without pressing their eyes against the eyecups, offering superior comfort during long observation periods such as astronomical surveys or marine monitoring.

Waterproof and Corrosion-Resistant Construction for Harsh Environments

Engineered for durability, the MT-SX features a sealed, weatherproof body built to withstand harsh environments like saltwater coasts, deserts, and observation towers. The corrosion-resistant materials and rugged metal chassis protect the internal optics from humidity, dust, and impact, ensuring years of uninterrupted performance. Whether mounted on a ship’s deck or installed in a fixed observation post, the binoculars remain reliable under extreme weather conditions.

Marine-Grade Aluminum Housing with Long-Term Structural Integrity

The housing of the Fujinon 25x150 MT-SX is crafted from high-grade aluminum alloy, delivering strength without unnecessary bulk. This robust construction ensures long-term optical alignment and resistance to vibration or shock. It’s designed for continuous outdoor operation, making it a trusted choice for maritime, defense, and research sectors that require stable, high-performance optics around the clock.

Compatibility with Polaris Eyepiece Filters for Versatility

The binoculars support Fujinon’s Polaris eyepiece filters, allowing users to adapt their viewing experience to different atmospheric or lighting conditions. Whether using polarizing filters to reduce glare over the ocean, haze filters for distant landscapes, or nebula filters for deep-sky astronomy, this compatibility enhances visual clarity and versatility—turning the MT-SX into a multi-environment observation system.

Precision Japanese Engineering for Professional Reliability

As a product of Fujinon’s Japanese optical heritage, the 25x150 MT-SX exemplifies precision craftsmanship, mechanical stability, and uncompromising performance. Each unit undergoes meticulous assembly and optical calibration to ensure flawless alignment and long-term dependability. This attention to detail has made Fujinon optics a benchmark in professional and defense-grade observation instruments worldwide.

Heavy-Duty Design for Fixed-Mount Operation

Weighing approximately 19.5 kg (43 lb) and measuring 36.6 × 19.3 × 96.3 cm, the Fujinon 25x150 MT-SX is purpose-built for tripod or pedestal mounting. This stability ensures vibration-free performance even at high magnification. When paired with Fujinon’s dedicated mount system, users achieve smooth 360° rotation and precise vertical movement—perfect for tracking celestial or long-distance terrestrial targets with accuracy and ease.

Professional-Grade Optical Precision with Lifetime Endurance

Every element of the MT-SX is engineered for consistent, repeatable precision, whether in astronomy, coastal observation, or defense applications. The combination of 25x magnification, 150mm aperture, and EBC multi-coating creates unmatched brightness, color accuracy, and resolution. Built to endure decades of professional use, these binoculars deliver both optical excellence and mechanical reliability that justify their position as a top-tier investment in long-range visual performance.

• Astronomical Observation – Perfect for deep-sky viewing, star clusters, and lunar observation, these binoculars deliver stunning brightness and detail with 150mm objectives and a wide 67° apparent field of view. They’re often used in observatories and by serious stargazers who want immersive sky scanning without the complexity of telescopic alignment.
• Maritime and Coastal Surveillance – Engineered for durability and precision, the MT-SX is widely used for harbor patrol, search and rescue, and coast guard operations. The waterproof, corrosion-resistant construction ensures consistent performance in saltwater environments, providing reliable target identification at vast distances over the sea.
• Military and Security Monitoring – Designed for professional-grade reliability, these binoculars are suitable for border security, base observation, and strategic surveillance. Their long-range 25x magnification and sharp optical fidelity enable users to detect, identify, and track distant objects with accuracy in all lighting conditions.
• Wildlife and Nature Observation – Ideal for observing wildlife across expansive terrain, the MT-SX offers long-distance clarity without disturbing animals. Its ability to produce bright, high-contrast images even at dawn or dusk makes it invaluable for researchers, rangers, and naturalists conducting field studies from afar.
• Aviation and Aerospace Monitoring – The binoculars’ high magnification and stability make them suitable for airfield observation, flight tracking, and aerospace research. Observers can easily follow aircraft or atmospheric phenomena while maintaining crisp image quality.
• Scientific and Industrial Applications – Used in environmental monitoring, meteorological observation, and infrastructure inspection, these binoculars provide researchers with reliable high-magnification imaging for field data collection. Their optical precision supports tasks that require accurate visual analysis from great distances.
• Port, Harbor, and Vessel Tracking – Port authorities and harbor operators rely on the MT-SX to monitor vessel traffic, approach routes, and docking zones. Its 25x zoom and wide field of view enable users to identify ships miles away with unmatched detail and color fidelity.
• Rescue and Emergency Response Operations – When quick visual assessment over large areas is crucial—such as during search and rescue missions—the MT-SX provides responders with a decisive advantage. Its light-gathering ability ensures clear visuals in low-light or foggy conditions, aiding in the detection of stranded or moving targets from a safe distance.
• Land Surveying and Environmental Studies – Geographers and researchers can use these binoculars for terrain mapping, environmental assessment, or geological observation. The sharp optics allow for detailed inspection of remote landforms, vegetation, and topographic features without the need for proximity.
• Professional Photography and Filmmaking Reference Tool – The MT-SX can serve as a spotting instrument for professional cinematographers and photographers capturing long-distance scenes. Its optical precision aids in framing distant subjects, ensuring ideal angles and lighting before camera setup.

Pros

• Exceptional optical clarity with Fujinon EBC multi-coated lenses for maximum light transmission and contrast.
• Massive 150mm objective lenses provide superior brightness and performance in low-light or night-time observation.
• Powerful 25x magnification delivers extreme long-range viewing with excellent image resolution.
• Waterproof and corrosion-resistant construction ensures durability in harsh marine or outdoor environments.
• Individual focus (IF) system maintains stable and precise focus once set, ideal for long observation sessions.
• Wide 67° apparent field of view offers an immersive, panoramic perspective.
• Rugged aluminum housing provides long-term structural integrity and vibration resistance.
• Compatible with Polaris eyepiece filters for enhanced image customization.
• Designed and manufactured in Japan with professional-grade precision and reliability.

Cons

• Heavy build (approximately 19.5 kg) requires a dedicated mount or tripod for stable operation.
• Not ideal for handheld use due to size and weight.
• Sold without the required mount, which must be purchased separately.
• High price point reflects its professional-grade design, which may not suit casual users.
• Individual focusing system can be slower to adjust when sharing between multiple users.

Discover the Essential Features of the Fujinon 25×150 MT-SX Binoculars (without Mount)

• 2.7° Angle of View
• Porro Prism
• Individual Focus
• Military-specification unit meant for outdoor installations
• Extremely effective as an astronomical unit
• Fujinon's EBC multi-coatings on every optical surface
• Optional dedicated mount
• Angled eyecups shield viewer from stray light
• Adjustable 60 to 70mm interpupillary distance setting
• Accepts Fujinon's Polaris series of eyepiece filters

Delve into the Detailed Specifications of the Fujinon 25×150 MT-SX Binoculars (without Mount)

	25 x 150 MT-SX
Magnification	25
Objective diameter (mm)	150
Field of view (°)	2.7
Apparent field of view (°)*1	61
Field of view at 1000m (m)	47
Exit pupil (mm)	6
Relative Brightness	36
Eye relief (mm)	18.6
Minimum Focus Distance (m)*2	125
Height (mm)	962
Width (mm)	365
Depth (mm)	525
Weight (g) (w/o Battery)	18,500
Adjustment range for interpupillary distance (mm)	60-70
Dioptric adjustment range (±mm)	-7～+3
Focus type	IF
Water resistant*3	2m-5min
Battery	-
Operating temperature	-20℃ - +50℃