Extra-Low Dispersion SCHOTT HT Glass HDC and AquaDura Lens Coatings. Phase-Corrected Roof Prisms Wide 67 Apparent Angle of View. Lubricant-free center focus system 58-74mm interpupillary adjustment range. Twist-out two-stage click-stop eyecups Tripod mountable with optional adapter. 4 right-eye dioptric correction with locking center diopter adjustment wheel