The Ares family of spotting scopes were designed with advanced optical quality and ease of use. Athlon made that task as easy as optically possible with bright, razor-sharp imagery and a rugged, weatherproof design that's ready for any condition. They have ED glass lenses for color resolution and contrast, AFMC (Advance Fully Multi-Coating), and feature a BaK4 prism with the ESP Dielectric Coating. They bring super-premium clarity and brightness within the reach of most avid enthusiasts. The tough chassis is fog proof and waterproof and filled with Argon gas to prevent internal fogging and for better thermal stability. The lens is treated externally with Athlon's XPL coating to withstand dirt, oil, and grime of constant use as well as standing up to harshest weather conditions. This model has a 7.5-22.5x50mm magnification.