Released in September 2005. *Eyepieces sold separately. Lightweight, compact, and highly portable field scope. Internal lens fogging is unlikely to occur even when used in rainy weather or in locations with large temperature fluctuations. Multi-layer coating is applied to the entire surface of the lens, prism, and dustproof glass, achieving a bright field of view. / [ED50 Oliv Green] ED50 Oliv Green. Released in September 2005. Lightweight, compact, and highly portable field scope. Waterproof* with nitrogen gas filling inside the body. *The waterproof design ensures that the internal optical system remains intact even when immersed in water 1 meter deep for 5 minutes, without affecting observation. However, this product cannot be used underwater. Internal lens fogging is unlikely to occur even when used in rainy weather or in locations with large temperature fluctuations. 50mm objective lens effective diameter. Lightweight, compact, and highly portable field scope. Nikon's proprietary ED glass is used for the objective lens. Multi-layer coating is applied to the entire lens, prism, and dust-resistant glass for a bright field of view. [Accessories] - Soft case ■ Specifications ■ Compatible models: 13-30x/20-45x/25-56x Zoom MC, 13-40x/20-60x/25-75x Zoom MC II, MC eyepieces: 16x/24x/30x Wide DS, 27x/40x/50x Wide DS, 40x/60x/75x Wide DS. Objective lens effective diameter: 50mm. Focusing range: ∞ to 3m. Filter attachment size: 55mm (P=0.75). Length x Height x Width (Body only): 209 x 94 x 71mm. Weight (Body only): 455g. Waterproof performance: Waterproof to a depth of 1m for 5 minutes (Fieldscope only. Not for underwater use). *Eyepieces sold separately. Manufacturer's warranty period: 1 year