Custom Dial System (CDS) precisely matches your rifle's ballistics Xtended Twilight Lens System optimizes the transmission of low-light wavelengths DiamondCoat 2 lens coatings provide Leupold's highest scratch resistance Blackened lens edges for a brighter image and increased contrast Absolute waterproof integrity Tactile power indicator also features built-in range estimation functions and graphite O-rings for easy operation 24k gold-plated ring and medallion Incredibly rugged, the Leupold VX-3L CDS Rifle Scope with 1&8221; Maintube features a Custom Dial System (CDS) that can be precisely matched to your rifle's ballistics. (With the purchase of this scope, send them your ballistics and they'll send you a customized elevation dial ballistically matched to your rifle.) Every CDS dial features -MOA click increment finger adjustments and no adjustment covers to lose. CDS dials change out easily, allowing you flexibility with different loads, conditions and calibers. The CDS system works by laser-inscribing your scope's elevation dial to match your load, velocity and conditions. The VX-3L Rifle Scope is loaded with optical technology: Xtended Twilight Lens System, DiamondCoat 2 lens coating, blackened lens edges, second generation waterproofing, twin bias spring erector system, and cryogenically treated adjustments. It's all there to help you make the shots of a lifetime. Manufacturer lifetime warranty. Made in USA. FOV = Field of View at 100 yards. Custom Dial System (CDS) precisely matches your rifle's ballistics Xtended Twilight Lens System optimizes the transmission of low-light wavelengths DiamondCoat 2 lens coatings provide Leupold's highest scratch resistance Blackened lens edges for a