For situations in extreme darkness, the enhanced low light performance of the 7 x 50 B ST has made this the standard binocular for special naval, military and law enforcement units throughout the world. The 7 x 50 configuration coupled with Steiner’s optical brilliance provide impressive mid 90 percent light transmission performance for surveillance, navigation and other low-light applications. M-22 reticle, and lightweight construction. Meets all military specifications for ruggedness, for a lifetime of high performance.