SA401 Pro APO Spotting Scope 15-35x Dual ED for Bird Watching

APO Apochromatic Optical Design 

Engineered with a 3-group, 3-element APO optical design for precise full-spectrum color correction, it effectively eliminates residual chromatic aberration and purple fringing found in standard lenses and conventional ED optics—delivering sharper edge-to-edge detail and more true-to-life color.

Dual ED and Lanthanum Glass Optical System

Combining dual extra-low dispersion (ED) glass with high-refractive-index lanthanum glass, this optical system effectively reduces aberrations and unwanted color fringing seen in standard glass—delivering brighter, more vivid, and true-to-life color.

11-Element, 7-Group Ultra-Wide-Angle Eyepiece

Featuring a premium 11-element, 7-group eyepiece design, it delivers an ultra-wide 59° to 75° apparent field of view across 15x to 35x zoom. Compared with traditional narrow-view eyepieces, the wider field makes it easier to track birds in flight with fewer adjustments.

92% Light Transmission K9 Prism + Full-Surface AR Coating

Featuring a high-transmission K9 prism and full-surface ultra-low-reflectivity AR coating, it maximizes light throughput while reducing glare and ghosting—delivering a brighter, cleaner, and higher-contrast image.

Oversized Focus and Zoom Rings

Designed with large wraparound focus and zoom rings, it locks onto subjects quickly with just 1.5 turns of coarse focus. Paired with a smooth 15x–35x stepless zoom ring, it delivers fast, precise, and comfortable control in the field.

IPX7 Nitrogen-Filled Waterproof and Fogproof

Built with IPX7-rated waterproof protection and a nitrogen-filled sealed body, it keeps out rain and prevents internal fogging for reliable performance in heavy rain, humidity, and harsh all-weather outdoor conditions.

Magnesium Alloy Body

Built with a one-piece magnesium alloy body, it combines lightweight strength, rugged durability, and reliable all-weather protection. Engineered to perform in extreme temperatures from -20°C to 50°C, it stays dependable from snowy cold to desert heat.

Standard UNC 1/4"-20 Thread Interface

The base features a standard 1/4"-20 UNC threaded mount for broad compatibility with most photography tripods and birding tripods, ensuring quick setup and stable viewing in the field.

Enjoy Digi-birding

Seamlessly connects with the SC002 electronic eyepiece camera, making it easy to record, capture, and share birding and outdoor observations.