Fully multi-coated lenses: increase light transmission with multiple anti-reflective coatings on all air-to-glass surfaces. Angled body design: is favored by users of different heights for viewing without adjusting the tripod height as frequently. The angled design works well when viewing at an upward angle. Magnesium body: sturdy and resistant to corrosion. Rubber armoring: provides a secure, non-slip grip. Multi-position adjustable eyecup: twists up and down for comfortable viewing with or without eyeglasses