The single piece 3-9x50 Sonora second focal plane riflescope has a 1-inch, aircraft-grade aluminum tube and offers a versatile blend of adjustment for a wide variety of applications. The Dead-Hold BDC is good for hunting at varying ranges where estimating hold-over is a concern. Fully multi-coated lenses increase light transmission with multiple anti-reflective coatings on all air-to-glass surfaces. The locking diopter eyepiece allows the user to set and lock the eyepiece setting once for their eye and forget it. The hard anodized finish provides a low-glare matte surface and helps camouflage position. O-ring sealed and nitrogen purged, the Sonora delivers water and fogproof performance. Rugged construction means this scope is shockproof.