Aspherical optics. The ST models are extremely robust, handle well and are lightweight at the same time. Thanks to their ergonomically optimized bodies, the slender binoculars provide a secure grip. Aspherical lenses with LUGER DIM full coating guarantee a bright, high contrast image. The five models of this product line cover an exceptionally wide range of fields: From the 8x30s generous, wide-angle field of view to the 7x50s large exit pupil and the 12x50s impressive twilight factor. All ST models come with a case and a strap. Distant, bright view. For close observations with an even brighter image: Like the ST 8x30, the ST 8x40 features a 140 m field of view but offers even more brightness due to its larger objective lens diameter. Closeness to the object is rendered possible by the 4.50 m near focus. Luger ST 8X40 Binoculars Features: SKU: 163-840-19 Brand: LUGER OPTIK - Binoculars, Spotting Scopes, Riflescopes Construction: Porro Prism Magnification: 8x Objective diameter (mm): 40 Field of View (1000m): 140 Focus System: Center Focus Strap: Yes Area of use: N/A Exit Pupil (mm): 5 Twillight factor: 17.89 Near focus (m): 4.5 Tripod fitting: Yes Waterproof :Yes Pouch: Yes Features: Wide Angel/Aspherical Lenses