German Precision Optics Spectra 4X 4-16x50i G4i Rifle Scope. This SPECTRA rifle scope series with a 30 mm main tube includes incredible features in a small, compact, and versatile optic with premium features such as top-notch optics, quickly adjustable turrets, a fast-focus eyepiece, and generous eye relief. The SPECTRA 4x is definitely the choice for those who turn hunting into a successful game shot. The reticle has an illuminated center point with adjustable brightness. Magnification: 4-16 Objective lens: 50mm Field of view at 100m: 10.4-3.1m Light transmission: 90% Reticle level: 2 Main tube: 30mm Adjustment click: 1cm Adjustment click: 1cm Length: 369mm Weight: 629g