Celestron TrailSeeker ED 10x42 ROOF Binocular
The TrailSeeker ED 10x42 binoculars are built to deliver exceptional performance for birdwatchers, hunters, and outdoor explorers. Designed with advanced optics, robust mechanics, and user-focused ergonomics, TrailSeeker ED offers image quality and reliability that rival binoculars priced far higher.
ED Objective Lens
Equipped with Extra-Low Dispersion (ED) glass, TrailSeeker ED effectively suppresses chromatic aberration, commonly seen as color fringing. The result is crisp, high-contrast images with excellent color accuracy and clarity from edge to edge.
Celestron’s premium-grade ED glass provides noticeably brighter and sharper views compared to standard non-ED binoculars. This advantage becomes especially clear in challenging lighting conditions such as early morning or late evening.

Coatings & Precision Prisms
TrailSeeker ED features fully multi-coated optics, ensuring every air-to-glass surface is treated with multiple anti-reflective layers to maximize light transmission.
Inside, high-quality BaK-4 prisms enhanced with phase and dielectric coatings reflect more light efficiently toward the eye. Together, these optical technologies deliver brighter images, improved contrast, and fine detail even in low-light environments.
The Body
The binocular housing is crafted from lightweight yet rugged magnesium alloy, offering excellent strength without unnecessary weight. A protective rubber armor provides a secure grip and added durability for demanding outdoor use.
TrailSeeker ED is fully waterproof and nitrogen-purged, preventing internal fogging and ensuring reliable performance in harsh weather and varying temperatures.
Twist-up eyecups with multiple click stops provide comfortable viewing for both eyeglass and non-eyeglass users, allowing easy customization for extended observation sessions.
Perfect for a Variety of Uses
With a close focus distance of just 8.2 feet, TrailSeeker ED is ideal for observing nearby subjects such as birds, butterflies, and plants. At the same time, the 10x magnification and wide field of view make it equally capable for tracking distant subjects in motion.
This balance of power and flexibility makes TrailSeeker ED a dependable all-purpose binocular for a wide range of outdoor activities.
Ways to Observe
TrailSeeker ED includes both a neck strap and a carrying harness, allowing you to choose the most comfortable carrying method. The binocular is also tripod adaptable, making it suitable for extended observation or digiscoping sessions (tripod adapter sold separately).
A protective soft case is included for safe storage and transport.
TECHNICAL SPECIFICATION
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Objective Lens Diameter
42mm (1.65")
Angular Field of View
6.5°
Linear Field of View (@1000 yds / @1000 m)
340 ft (103 m)
Eyepiece Cup Diameter – Outside Top Edge
41mm (1.61")
Eyepiece Cup Diameter – Outside Bottom Edge
43.5mm (1.71")
Eyepiece Lens Cover Diameter – Inner Diameter of Cup Furthest Recess
41.5mm (1.63")
Eyepiece Lens Cover Diameter – Inner Diameter of Cup Edge
44mm (1.73")
Objective Bell External Diameter – Outside Forward Edge
50mm (1.97")
Close Focus
8.2 ft (2.5 m)
Interpupillary Distance (Max)
74mm (2.91")
Interpupillary Distance (Min)
56mm (2.20")
Diopter Adjustment Range
±3
Relative Brightness
18.23
Limiting Stellar Magnitude
Ideal: 10.62
Moderate: 9.62
Poor: 8.62
Lens Coatings
Fully Broadband Multi-Coated
Prism Coatings
Phase and Dielectric Coated
Environmental Protection
Waterproof
Dimensions
139.7mm x 124.46mm x 50.8mm (5.5" x 4.9" x 2")
Included Items
Objective Lens and Eyepiece Caps | Neck Strap | Carrying Harness | Lens Cloth | Instruction Manual
☀️ Solar Warning:
➠ Never look directly at the Sun with the naked eye or with an optic (unless you have the proper solar filter). Permanent and irreversible eye damage may result..
➠ Never use your optic to project an image of the Sun onto any surface. Internal heat build-up can damage the optic and any accessories attached to it.
➠ Never leave your optic unsupervised. Make sure an adult who is familiar with the correct operating procedures is with your optic at all times, especially when children are present.