Celestron's legendary Skymaster biney glasses get an upgrade with ED lenses for outstanding images that are practically free of chromatic aberration, with natural colors, increased resolution and improved contrast Large 80 mm lenses offer excellent lighting ability-perfect for astronomy The eyepieces with threads are suitable for all common 1.25 "astronomy owl filters to highlight details or reduce the effects of light pollution. BAK-4 prisms and fully multi-compatible optics with XLT remuneration increase the light permeability in the radiation for lighter, More detailed images The widely apart lens lenses of the Porro-prism look ensure an improved 3-D view of glasses-friendly with spacious eye distance and padded, rotating eye mussels Durable, rubber-tormented housing with improved ergonomics for comfortable use in the field of tripod.