The Big Sky line features Enhanced Definition glass that ensures the highest edge-to-edge fine contrast and resolution available. They also include our new Climate Control Coating on external glass surfaces and are enhanced by our 7-layer Zact-7 Revcoat multi-coating on all internal surfaces that make these optimal for any and all weather and light conditions. All scopes accept sunshades. Durability ensured with our true mono-tube design. All SII Big Sky scopes feature our newly improved ExacTrack system for unsurpassed repeatability and reliability. The 6x is the ideal fixed power hunting scope for almost every situation.