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The Maksutov optical design is recognized for being a portable design that is easy to use and has a variety of applications, making it an excellent choice for both terrestrial and astronomical usage. This C90 Mak has excellent optics with razor sharp images over a wide field. 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° Erect Image Diagonal and 8x21 Erect Image Finderscope - Backpack Made of Nylon - No Fault Limited Lifetime Warranty Specifications - OPTICAL DESIGN: Maksutov - APERTURE: 90 mm (3.54 in) - Focal length: 1250 mm (49.21 in) - FOCAL RATIO: 13.89 - FINDERSCOPE: 8x21 - ANGLE: 0 or 45 ° - EYEPIECE 1: 32 mm (1.26 in) - MAGNIFICATION 1: 39 x - CARRYING CASE: Backpack made of nylon - Angular field of view: 1.3 ° - LINEAR FIELD OF VIEW (@1000 YDS): 68 ft (20.73 m) - LINEAR FIELD OF VIEW (@1000 M): 23 m (75.46 ft) - Eye relief: 20 mm (0.79 in) - NEAR FOCUS (BINOCULARS): 15 ft (4.57 m) - OPTICAL COATINGS: Multi-Coated - TRIPOD ADAPTABLE: Yes - CAMERA ADAPTABLE: Optional T-Adapter - OPTICAL TUBE LENGTH: 16 in (406.4 mm) - WEIGHT: 5 lb (2.27 kg)
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