TrailSeeker ED 10x50mm Roof Binoculars
TrailSeeker ED 10x50mm Roof Binoculars
Item #: 71408
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- ED OBJECTIVE LENSES: Reduce chromatic aberration for sharp detail, accurate color reproduction, and improved contrast
- 50MM OBJECTIVE LENSES: Gather ample light for brighter, more detailed views, especially in low-light conditions
- FULLY BROADBAND MULTI-COATED OPTICS: Maximize light transmission across the entire optical path for increased brightness and clarity
- ROOF PRISM DESIGN: Creates a streamlined, durable profile that’s comfortable to carry and handle in the field
- PHASE- AND DIELECTRIC-COATED BaK-4 PRISMS: Enhance brightness, contrast, and color fidelity for vivid, true-to-life images
- WIDE FIELD OF VIEW & 9.8 FT CLOSE FOCUS: Follow subjects in motion and at closer range
- TRIPOD-ADAPTABLE: Adds stability for extended viewing sessions or long-distance observation
Specifications
Specifications
| General | |
|---|---|
| Magnification: | 10x |
| Objective Lens Diameter: | 50mm |
| Angular Field of View: | 6.5° |
| Linear Field of View (@1000 yds) / @1000 m): | 341 ft (114m) |
| Exit Pupil: | 5mm |
| Eye Relief: | 16.9mm |
| 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: | 9.8' |
| Interpupillary Distance (max): | 74mm |
| Interpupillary Distance (min): | 60mm |
| Diopter Adjustment Range: | ±3 |
| Twilight Factor: | 22.36 |
| Relative Brightness: | 25 |
| Limiting Stellar Magnitude: | Ideal: 10.99, Moderate: 9.99, Poor: 8.99 |
| Lens Coatings: | Fully Broadband Multi-Coated |
| Prism Glass (Type): | Bak-4 |
| Prism Coatings: | Phase and Dielectric Coated |
| Weight: | 896g |
| Environmental Protection: | Waterproof |
| Nitrogen Filled: | Yes |
| Tripod Adaptable: | Yes |
| Carrying Case: | Soft Case |
| Dimensions: | 168mm x 138mm x 63mm |
| Included Items: | Loop-tethered objective lens caps One-piece eyepeice lens covers Neck strap Harness strap Carrying case Lens cloth Quick Setup Guide Instruction manual (digital) |
| Additional Information | |
| Solar Warning |
|
| California Prop 65 |
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov |
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Also Includes
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Included Technology
ED Glass
ED stands for "extra-low dispersion," which refers to the composition and optical properties of the glass used for the lenses. ED glass is specially formulated and contains rare-earth compounds that greatly reduce a visual defect called chromatic aberration.
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TrailSeeker ED 10x50mm pairs high-end optical performance with a rugged, field-ready design. Built for serious birders, hunters, and outdoor observers, it delivers the clarity and durability you’d expect from binoculars costing two to five times as much.
ED Objective Lenses
TrailSeeker ED features Extra-Low Dispersion (ED) objective lenses designed to control chromatic aberration, the color fringing that can appear along high-contrast edges. By bringing different wavelengths of light to the same point of focus, ED glass improves resolution, contrast, and overall image fidelity.
However, the performance of ED glass depends heavily on its quality and execution. The ED elements in TrailSeeker ED are engineered to deliver meaningful gains in sharpness, contrast, and color accuracy, producing visibly brighter, cleaner images than standard optical glass. The improvement becomes especially noticeable in low light at dawn and dusk.

Coatings and Prisms
TrailSeeker ED features fully broadband multi-coated optics to maximize light transmission. Fully broadband multi-coated is the highest-quality multi-coating available; it extends the range throughout the visual spectrum.
Inside, BaK-4 prisms with both phase and dielectric coatings further enhance performance. Phase coatings correct internal light path distortions to improve resolution and contrast, while dielectric coatings increase reflectivity for higher overall brightness. Together, fully multi-coatings and BaK-4 prisms maximize light transmission for the brightest, most detailed images possible.
The Body
TrailSeeker ED features a lightweight magnesium alloy chassis that delivers exceptional strength without unnecessary weight. The rigid frame is wrapped in durable rubber armor for a secure grip and added protection in the field.
Fully waterproof and nitrogen-purged, the binocular resists rain, dust, and internal fogging, so performance stays consistent in changing conditions.
Twist-up eyecups with multiple click stops allow you to fine-tune your eye position for comfortable viewing, whether you wear glasses or not.
Perfect for a Variety of Uses
TrailSeeker ED focuses down to 9.8 feet, so you can observe nearby wildlife without switching gear. At 10x magnification, it also pulls distant subjects in close, while a wide field of view makes it easier to track movement across open terrain or sky. It’s built for observers who want one binocular that can handle the whole landscape.
Ways to Observe
TrailSeeker ED includes both a neck strap and a carrying harness so you can choose the option that’s most comfortable for you. It’s also tripod adaptable, so you can mount it on any standard photographic tripod for extended viewing or digiscoping sessions. (Tripod adapter sold separately.) The binocular also includes a protective soft case for storage or transport.
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