The Celestron C90 Mak Spotting Scope is an excellent choice for both terrestrial and astronomical usage. This C90 Mak has excellent optics with razor sharp images over a wide field. The C90 Mak features an internal flip mirror design which allows the user to view celestial objects at a 90 degree angle and also corrects the image orientation to view land objects at a 45 degree angle. The full-featured C90 MAK is also rubber covered and completely waterproof. This model features durable black rubber armour for protection, a flip up lens cap for safety, and it comes complete inside its own soft sided carrying case. Features: - Multi Coated Optics - Maksutov-Cassegrain Optical Design - Compact and Portable Design - Erect Image System for Terrestrial and Astronomical Use - Built-in T-Adapter threads for Ease of Adapting SLR Cameras - Comes with 32 mm Eyepiece, 45 deg Erect Image Diagonal and 8x21 Erect Image Finderscope - Backpack Made of Nylon Specifications - Optical Design: Maksutov - Aperture: 90 mm - Focal Length: 1250 mm - Focal Ratio: 13.89 - Finderscope: 8×21 - Angle: 0 or 45 deg - Eyepiece 1: 32 mm - Magnification 1: 39× - Angular Field Of View: 1.3 deg - Eye Relief: 20 mm - Near Focus (Binoculars): 4.57 m - Tripod Adaptable: Yes - Camera Adaptable: Optional T-Adapter - Optical Tube Length: 406.4 mm - Weight: 2270g