Fujinon Mariner Binoculars

Fujinon Mariner Binoculars with Waterproof Marine Housing, Multi-Coated Optics & Wide Field of View

The sea pulls you in—clarity keeps you safe. The Fujinon Mariner Binoculars are purpose-built marine optics designed for boaters, sailors, anglers, and coastal professionals who demand dependable visual performance in harsh, unpredictable environments, making them a smart, confidence-driven choice to buy when reliability matters more than gimmicks. Engineered with Fujinon’s proven optical expertise, these binoculars deliver bright, high-contrast viewing through multi-coated glass elements that reduce glare, improve light transmission, and maintain sharp image clarity even in challenging conditions like haze, glare off water, low light, or overcast skies.

Built for marine use first—not adapted later—the Mariner series features a rugged, waterproof construction that protects internal optics from moisture, salt spray, humidity, and sudden weather changes, while nitrogen-filled sealing helps prevent internal fogging when temperatures shift rapidly. The durable, rubber-armored housing provides a secure, non-slip grip even with wet hands, improving handling on moving decks and ensuring stability during extended observation. Designed with long-distance viewing in mind, Fujinon Mariner Binoculars offer wide fields of view for tracking vessels, navigation markers, shorelines, and marine wildlife with reduced eye strain, while smooth, precise focus control allows fast adjustments when conditions or distances change.

Select configurations within the Mariner lineup are optimized for steady marine observation, prioritizing balance and comfort to minimize fatigue during prolonged use—an essential advantage for navigation, watchkeeping, or offshore activities. Unlike general-purpose binoculars that struggle in marine environments, the Mariner series is built to endure constant exposure to water, wind, and sun without sacrificing optical performance, making it a trusted tool rather than a disposable accessory. Whether you’re navigating open water, scanning the horizon for safety, spotting landmarks, or enjoying wildlife from the deck, Fujinon Mariner Binoculars deliver dependable performance, durability, and optical consistency that justify their place aboard any vessel.

If you’re ready to invest in marine-grade optics that work when conditions don’t cooperate, buy Fujinon Mariner Binoculars today and equip yourself with clear vision you can rely on—every mile, every wave.

Product Benefits:

• See clearly when conditions turn against you – High-quality multi-coated optics cut glare and haze so targets stay sharp in bright sun, spray, and low light.
• Stay confident on open water – Marine-grade waterproof construction protects the optics from waves, rain, and salt, keeping vision reliable when safety depends on it.
• Reduce eye strain during long watches – Bright image transmission and wide field of view make extended scanning more comfortable and less fatiguing.
• Maintain focus on moving targets – Smooth, precise focus control allows fast adjustments when vessels, markers, or wildlife change distance.
• Trust gear that won’t fail at sea – Rugged, sealed housing resists corrosion and internal fogging caused by humidity and temperature shifts.
• Handle securely in rough conditions – Non-slip rubber armor improves grip with wet hands, enhancing control on moving decks.
• Navigate with greater awareness – Wide viewing angles help track multiple objects at once, improving situational awareness and reaction time.
• Built for real marine use, not casual viewing – Designed specifically for boating and offshore environments, not adapted from land binoculars.
• Long-term value for serious users – Durable construction and dependable optics reduce the need for replacements, saving money over time.
• Peace of mind offshore – Reliable visual performance means fewer uncertainties and more confidence every time you head out on the water.

Features:

7× Magnification with 50 mm Objective Lenses

The Fujinon Mariner Binoculars are designed with a 7× magnification paired with large 50 mm objective lenses, a standard trusted by professionals in marine optics because it strikes the perfect balance between power and stability. The 7× zoom ensures steady images even when your hands are unsteady on a rocking boat, while the wide 50 mm objective lenses capture more light for brighter views. This combination makes them highly effective for low-light conditions such as dusk, dawn, or cloudy weather at sea, allowing you to spot buoys, vessels, or coastlines with clarity.

Wide Field of View for Horizon Scanning

With a field of view reaching 7.5° on the WP-XL model and 7.0° on the WPC-XL compass model, these binoculars give you the ability to scan large sections of the horizon quickly. In practical terms, that translates to 131 m or 122 m visible width at a distance of 1000 m, depending on the variant. Such breadth ensures you can monitor multiple moving objects, follow marine wildlife, or assess approaching vessels without constant readjustment, which is essential in fast-changing marine environments.

High Light Transmission with EBC Multicoatings

The lenses and prisms are treated with Fujinon’s EBC (Electron Beam Coating), a proprietary multi-coating process that increases light transmission while minimizing glare and internal reflections. For users, this means crisp contrast, truer color rendition, and the ability to see finer details even in bright sunlight reflecting off the water. When safety and navigation depend on being able to distinguish subtle differences in shapes and colors, this superior coating technology offers a distinct advantage over cheaper alternatives.

Long Eye Relief and Comfortable Eyecups

One of the standout features of the Fujinon Mariner Binoculars is their generous 18 mm eye relief. This allows eyeglass wearers to enjoy a full field of view without removing their glasses. Combined with soft fold-down eyecups, the binoculars provide flexibility for every user, whether they prefer using glasses, sunglasses, or bare eyes. Comfort during long periods of use is critical in marine navigation, and this thoughtful design ensures reduced eye strain and uninterrupted observation.

Rugged Polycarbonate Housing with Rubber Armor

Marine environments are unforgiving, which is why the Fujinon Mariner series is encased in impact-resistant polycarbonate, making them both strong and lightweight. The addition of rubber armor not only protects the optics from shocks and knocks but also adds a layer of grip security. At just 885 g for the WP-XL and 910 g for the WPC-XL, these binoculars are lighter than many comparable marine models, reducing fatigue during extended use while still withstanding the harsh conditions of saltwater, sun, and wind.

Waterproof and Nitrogen-Purged Construction

Reliability on the water requires complete weatherproofing, and these binoculars deliver with full waterproof sealing, tested to withstand immersion at 1 meter for 5 minutes. Beyond simple water resistance, they are nitrogen-purged to eliminate internal fogging that typically occurs with sudden temperature changes—such as moving from a hot cabin to the cool open deck. This robust protection ensures you always see a clear, unobstructed image, no matter the environment.

Floating Capability with Neck Strap

The included flotation neck strap makes the Fujinon Mariner Binoculars virtually unsinkable when attached properly. In the event of accidental drops into the water, the strap ensures that the binoculars float to the surface, allowing you to retrieve them quickly. This unique safety feature eliminates the risk of losing a critical piece of gear at sea, which is a real concern for boaters and fishermen handling equipment in wet, unstable conditions.

Individual Eyepiece Focusing with ±4 Diopter Adjustment

Instead of a central focus wheel, the Fujinon Mariner series uses an individual focus system where each eyepiece can be adjusted independently. This setup allows for precise, permanent adjustments tailored to the user’s vision and eliminates the need to refocus constantly. The ±4 diopter range makes it possible to compensate for differences in each eye’s prescription, offering crystal-clear clarity personalized to the user’s eyesight.

Built-in Compass with LED Illumination (WPC-XL Variant)

For navigators and serious mariners, the WPC-XL model includes a precision compass with ±0.5° accuracy, integrated directly into the binocular housing. This feature enables users to take bearings and measure direction while simultaneously observing distant objects, making it invaluable for navigation at sea. The compass includes LED illumination, powered by two LR43 batteries, allowing accurate readings even in the dark or during overcast conditions. This dual-purpose functionality reduces the need for separate navigation tools, saving time and improving efficiency.

Excellent Low-Light Performance with Large Exit Pupil

A 7.1 mm exit pupil size, coupled with a relative brightness rating of 51, makes the Fujinon Mariner Binoculars outstanding in dim or challenging lighting conditions. This is especially useful at dawn, dusk, or during stormy weather when natural light is limited, but visibility is critical for safety. The optics deliver images that remain bright, clear, and usable when many competing binoculars fall short, giving users confidence in conditions that are often the most dangerous.

Versatile Operating Temperature Range

Tested to operate between –20 °C and +50 °C, these binoculars maintain performance in extreme cold and heat. Whether you’re navigating icy waters in the early morning or sailing under the blazing summer sun, the optical clarity and structural integrity remain intact. This resilience provides assurance that the binoculars are built for true all-weather performance, not just ideal conditions.

Complete Accessory Package for Practical Use

Each pair of Fujinon Mariner Binoculars comes with tethered objective lens caps, an eyepiece rainguard, a microfiber cleaning cloth, the flotation neck strap, batteries for the compass version, and a user manual. These accessories extend usability, protect the lenses from damage, and add convenience for handling in unpredictable weather. Importantly, the flotation strap doubles as both a carrying aid and a safety measure, demonstrating that Fujinon designed every element with real-world marine use in mind.

Lightweight Yet Durable Choice in Its Class

At under 1 kg, the Fujinon Mariner Binoculars stand out for offering a lighter build without sacrificing strength, waterproofing, or optical power. Many competing 7×50 marine binoculars weigh significantly more, which can quickly lead to hand fatigue or difficulty stabilizing during long use. This weight advantage, combined with Fujinon’s build quality, makes the Mariner series a practical long-term investment.

• Marine Navigation – Use the 7×50 optics and optional built-in compass for safe course plotting, reading buoys, and identifying landmarks at sea.
• Fishing Trips – Spot feeding activity, floating debris, or distant vessels quickly, even in low-light dawn and dusk conditions.
• Sailing and Yachting – Monitor approaching boats, weather changes, and coastline features while enjoying reliable waterproof performance.
• Search and Rescue Operations – Benefit from wide field of view, bright optics, and floating capability for quick spotting in emergency situations.
• Coastal Patrol and Security – Reliable tool for scanning harbors, ports, or coastline areas to detect unusual activity or vessels.
• Outdoor Expeditions – Ideal for rivers, lakes, or wet environments where durability, fogproofing, and waterproofing are critical.
• Wildlife Observation – Track seabirds, marine mammals, and other wildlife with clear, stable viewing across wide horizons.
• Night Cruising – With large 50 mm objectives and 7.1 mm exit pupils, they perform well in dim light, making them useful for night navigation.
• Commercial Shipping and Transport – Support crew safety and operational efficiency by improving visibility during docking, loading, or navigation.
• Emergency Preparedness Gear – Trusted as part of safety kits for lifeboats, coast guards, and offshore workers due to flotation strap and rugged build.

Pros

• 7×50 optical design delivers bright, stable images suitable for marine use.
• Wide field of view (7.5° WP-XL / 7.0° WPC-XL) helps scan horizons efficiently.
• Long 18 mm eye relief makes them comfortable for eyeglass wearers.
• Waterproof (1 m for 5 minutes) and nitrogen-purged to prevent fogging.
• Rugged polycarbonate housing with rubber armor provides durability and grip.
• Floating neck strap ensures recovery if dropped into the water.
• Individual eyepiece focus with ±4 diopters allows precise adjustment.
• WPC-XL model includes a built-in compass with LED illumination for navigation.
• Excellent low-light performance thanks to a 7.1 mm exit pupil and 50 mm lenses.
• Lightweight design compared to many other 7×50 marine binoculars.

Cons

• Minimum focusing distance of 12.3 m limits close-up viewing.
• Individual focus system may feel less convenient for those used to center focus wheels.
• Narrower field of view in the compass model (WPC-XL).
• Waterproofing is limited to short accidental immersion, not prolonged underwater use.
• Smooth housing can feel slippery when wet despite rubberized sections.
• Compass model is heavier and bulkier than the WP-XL version.

Discover the Essential Features of the Fujinon 7x50 WP-XL & 7x50 WPC-XL Mariner Binoculars

• Fujinon's Economical Boating Model
• Porro Prism Optical Design
• 7.0° Angle of View
• Individual Focus
• Light Polycarbonate Housing
• LED-Illuminated Compass for 7x50 WPC-XL with Compass
• Floats in Water with Strap Attached
• Fogproof and waterproof
• Well-suited for maritime activities, bird-watching, and other outdoor observations

• Model Variants: 7×50 WP-XL (standard), 7×50 WPC-XL (with compass)
• Magnification: 7×
• Objective Lens Diameter: 50 mm
• Field of View (Angular): 7.5° (WP-XL), 7.0° (WPC-XL)
• Apparent Field of View: 49.3° (WP-XL), 46.4° (WPC-XL)
• Field of View at 1000 m: 131 m (WP-XL), 122 m (WPC-XL)
• Exit Pupil: 7.1 mm
• Relative Brightness: 51
• Eye Relief: 18 mm
• Minimum Focus Distance: 12.3 m
• Interpupillary Distance: 56 mm – 72 mm
• Diopter Adjustment: ±4 diopters
• Prism Type: Porro prism
• Focus Type: Individual eyepiece focus
• Eyecups: Fold-down rubber type
• Lens Coating: EBC multicoating on lenses and prisms
• Body Material: Polycarbonate with rubber armor
• Waterproof Rating: 1 m depth for 5 minutes
• Fogproofing: Nitrogen-purged
• Operating Temperature: –20 °C to +50 °C
• Height: 180 mm
• Width: 201 mm
• Depth: 65 mm (WP-XL), 76 mm (WPC-XL)
• Weight (Without Battery): 885 g (WP-XL), 910 g (WPC-XL)
• Compass (WPC-XL Only): Built-in, ±0.5° accuracy
• Compass Illumination: LED light for scale reading
• Compass Battery: 2 × LR43 batteries
• Accessories Included: Objective lens caps, eyepiece rainguard, flotation neck strap, cleaning cloth, user manual, compass batteries (WPC-XL only)
• Warranty: Fujifilm limited regional warranty

What's Included in the Fujinon 7x50 WP-XL & 7x50 WPC-XL Mariner Binoculars

• Fujinon 7x50 WP-XL or 7x50 WPC-XL Mariner Binoculars
• Strap
• Eyepiece Rainguard
• Tethered Push-On Objective Lenscaps
• Cleaning Cloth
• Limited Warranty

What are the main differences between the WP-XL and WPC-XL models?

The WP-XL is the standard 7×50 marine binocular without a compass, while the WPC-XL adds a built-in, LED-illuminated bearing compass. The WPC-XL is slightly deeper and heavier due to the compass module and shows a marginally narrower field of view.

Do these binoculars float if dropped overboard?

Yes—when the included flotation neck strap is properly attached. The strap is designed to keep the binoculars buoyant long enough for quick retrieval in typical boating scenarios.

How waterproof and fogproof are the Fujinon Mariner binoculars?

They are sealed and nitrogen-purged for internal fog resistance and rated for brief immersion (1 meter for up to 5 minutes). This protects the optics from spray, rain, and accidental splashes, but they are not intended for prolonged underwater use.

Are they suitable for eyeglass wearers?

Absolutely. With 18 mm of long eye relief and fold-down eyecups, most eyeglass wearers can see the full field without removing their glasses. Adjust each eyepiece and eyecup position to taste.

How does the individual focus system work at sea?

Instead of a center focus wheel, each eyepiece focuses independently. Set the left eyepiece for your left eye, the right for your right eye, and you’re done—no constant refocusing when you shift from near to far targets. This is ideal for scanning horizons and reading distant markers.

What batteries does the compass use and how long do they last?

The WPC-XL’s LED compass illumination uses two LR43 button cells. Battery life varies with temperature and usage, but because the LED is used intermittently (only when needed for night or low-light readings), a set typically lasts many outings.

How well do they perform in low light?

The 7×50 optical formula produces a 7.1 mm exit pupil and excellent light gathering. Combined with multicoated optics, this yields bright, high-contrast images at dawn, dusk, and in overcast conditions—key moments for navigation and safety.

What is the field of view and why does it matter on the water?

The WP-XL offers a wide 7.5° field (about 131 m @ 1000 m) and the WPC-XL about 7.0° (122 m @ 1000 m). Wider views help you scan large sections of horizon quickly, follow moving vessels, and maintain situational awareness in busy waterways.

What accessories are included in the box?

Each unit comes with tethered objective caps, an eyepiece rainguard, a flotation neck strap, a cleaning cloth, and a user manual. The WPC-XL also includes the LR43 batteries for the compass illumination.

Can I mount these binoculars on a tripod?

Marine 7×50s are typically hand-held, but many users employ a universal Porro-prism tripod adapter (sold separately). If you need hands-free viewing from a stable platform, check compatibility with a suitable adapter before purchasing.

What is the operating temperature range?

They’re designed to function from approximately −20 °C to +50 °C, covering most real-world marine environments—from chilly dawn patrols to hot mid-day runs—without internal fogging or performance loss.

How should I clean and care for the optics?

Blow off loose grit with a bulb blower, lightly brush remaining dust, then use a microfiber cloth with a few drops of lens cleaning solution. Avoid household cleaners, paper towels, and excessive pressure, and always replace caps when not in use.

Are the lenses and prisms coated?

Yes. The Mariner series uses multi-coatings (including Fujinon’s high-transmission treatments) on lenses and prisms to reduce reflections and enhance contrast—crucial for cutting through glare on open water.

How do I set interpupillary distance (IPD) and diopter?

Fold the binoculars until both circular images merge into one for your IPD. Then focus the left eyepiece on a distant target, switch to the right eyepiece and adjust its diopter ring until both eyes see sharp detail. Note the diopter mark for future reference.

What kind of warranty do these binoculars have?

Fujinon provides a limited warranty whose terms vary by region and retailer. Keep your proof of purchase, register if applicable, and consult the local distributor for coverage details and service procedures.