Vixen Astronomy Binoculars BT-81S-A

 See the Stars in Sharp, True Colors

Looking for breathtaking stargazing without eye strain or color distortion? Discover the Vixen BT-81S-A—binoculars built for ultimate clarity and comfort in every session.

Features

• Optimal Aperture & Focal Length: The 81mm aperture and 480mm focal length provide bright, wide views, ideal for both celestial and terrestrial observation.
• Ergonomic 45-Degree Angled Design: Designed for comfort, the angled eyepieces reduce neck strain for extended stargazing sessions.
• Premium Optical Coating: Magnesium fluoride coating minimizes chromatic aberration, delivering vibrant, true-to-life colors with enhanced clarity.
• Customizable Eyepiece Compatibility: Use standard 31.7 mm (1.25 inch) eyepieces for a tailored viewing experience, allowing you to adapt to different magnifications and needs.
• Lightweight Yet Durable Build: Weighing only 9 lb (4.1 kg) and constructed from rugged aluminum, this binocular is easy to carry on any adventure.
• Sharp, High-Contrast Images: Experience breathtaking detail for observing the Moon, nebulae, star clusters, and more, all rendered in stunning clarity.

The Vixen BT-81S-A is for you if…

• You Demand Exceptional Clarity: Seeking binoculars with no chromatic aberration? Enjoy sharp, distortion-free views every time.
• You Need Portability for Outdoor Adventures: At only 9 lb, it’s easy to bring this high-performance optical tool wherever you go.
• You Value Versatility in Viewing: With 1.25-inch eyepiece compatibility, these binoculars adapt to various mounts and eyepieces for a truly customizable experience.
• You Want Durability in Challenging Environments: Built from robust aluminum, the BT-81S-A withstands rugged outdoor conditions without compromising performance.
• You Require Comfort for Long Viewing Sessions: The 45-degree angled design and quality eyepiece sockets minimize strain, letting you observe for hours without discomfort.
• You Enjoy Both Stargazing and Nature Observation: These binoculars excel at both night sky and terrestrial views, making them perfect for the dual-purpose observer.

Immerse Yourself in True-to-Life Celestial Views

Picture a perfect night under the stars, where every celestial object appears with unparalleled clarity and detail. The Vixen BT-81S-A binoculars transform stargazing into a deeply immersive experience, thanks to their impressive 81mm aperture and fast f/5.9 focal ratio, capturing a bright, expansive field of view. With a resolving power of 1.43 arc seconds, these binoculars reveal fine details that standard models simply can’t, letting you distinguish the intricate structure of the Moon's craters, the glowing arms of distant spiral galaxies, and the delicate wisps of gaseous nebulae. Enhanced by a magnesium fluoride optical coating, these binoculars eliminate chromatic aberration for a pure, distortion-free image with true-to-life colors.

For seasoned stargazers, extended viewing sessions can be physically demanding. The Vixen BT-81S-A’s 45-degree angled eyepieces and permanently attached diagonals are designed for all-night comfort, taking strain off your neck and allowing for uninterrupted sky-watching. With an adjustable interpupillary distance ranging from 58mm to 102mm, these binoculars adapt precisely to your needs, making them ideal for extended observations of planets, star clusters, and intricate lunar details.

Customization is at the heart of the Vixen BT-81S-A’s design. Standard 1.25-inch eyepiece compatibility allows you to enhance your experience by choosing eyepieces that provide the magnification or field of view best suited to your observation. Pair it with low-power eyepieces for wide swaths of the Milky Way or switch to high-power options for close-ups of Saturn’s rings or Jupiter’s Great Red Spot. The dovetail bar is compatible with SX and GP mount systems, making it simple to secure your binoculars on a wide range of mounts. Additionally, friction-fit eyepiece holders provide an easy, secure fit for quick changes as you move from one celestial object to the next.

Built to Travel: Durable and Portable Design

Portability and durability are essential for serious observers who frequently venture to remote, dark-sky locations. Weighing in at just 9 lb (4.1 kg) and constructed with a robust aluminum body, the Vixen BT-81S-A is designed to withstand rugged outdoor conditions without adding unnecessary weight to your pack. The protective dew caps keep your optics pristine by shielding them from moisture and dust, ensuring clear, fog-free viewing even in damp environments. With two 1/4-inch and one 3/8-inch threaded sockets, this binocular easily mounts to tripods or other support systems, providing versatile setup options wherever you are.

Ready for Every Adventure

Each Vixen BT-81S-A package includes essential accessories that enhance your stargazing experience. The integrated carry handle ensures secure handling and easy transport, whether you’re setting up in a new spot or packing for a night under the stars.

The integrated finderscope dovetail bracket simplifies precise targeting of celestial objects. Attach a finderscope seamlessly to locate and focus on specific stars, planets, or deep-sky objects with ease, helping you lock onto your target quickly.

Finally, protective dew caps keep your optics pristine by shielding lenses from moisture and dust, ensuring crystal-clear viewing during transport and in damp environments. Together, these accessories ensure your Vixen BT-81S-A binoculars are always protected, accessible, and ready for any adventure.

Elevate Your Viewing Experience with Recommended Accessories

To get the most out of your Vixen BT-81S-A binoculars, consider pairing them with accessories designed to enhance stability and ease of use:

• Vixen HF2 Fork Mount: This mount provides smooth, precise movements for tracking celestial objects effortlessly across the sky. Its sturdy design supports your binoculars with balanced control, making extended observation sessions more enjoyable.
• Vixen SXG-HAL130 Aluminum Tripod: Lightweight yet durable, this tripod offers a rock-solid base that minimizes vibration, keeping every star and nebula sharp and clear. The adjustable height offers added flexibility for comfortable viewing from any position.
• Vixen Fork Mount Swing Bracket: Seamlessly integrates your binoculars and mount, offering flexible movement and enabling quick adjustments as you scan the night sky. This setup provides the stability, ease, and control needed for a complete stargazing experience.