MARATHON Focus Free 10 x 50 Military Grade Binocular. Compact for Sports, Safaris, Tracking, Mountaineering, Bird Watching and Other Outdoor Activities. Colour-Black. SKU-BI030029 PREMIUM QUALITY PRISM- Barium Crown glass (BAK4). 10x magnification and 50mm objective diameter. FIELD OF VIEW- 342 ft @ 1000 yds / 114m @ 1000m. LENSES- Fully coated lenses for superior image brightness. Eye Relief of 19mm. FOCUS FREE SYSTEM- Fixed focus- No focus adjustment needed. ACCESSORIES INCLUDED- Neck strap, eye-cup protectors, objective lens protectors, carrying case, lens cloth and instructions.