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. 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 Magnification 39x (with included eyepiece) Objective Lens Diameter 90mm (3.54") Eyepieces 32mm Plossl (1.26") Angular Field of View 1.3° with included eyepiece Linear Field of View (@1000 yds) / @1000 m) 68 ft (20.7 m) with included eyepiece Focal Length 1250mm (49") Exit Pupil 2.3mm (0.1") with included eyepiece Eye Relief 20mm (.78") with included eyepiece Close Focus 15 ft (4.6 m) with included eyepiece Twilight Factor 59.2 with included eyepiece Relative Brightness 5.3 with included eyepiece Lens Coatings Multi-Coated Prism Glass (Type) BaK4 Prism Coatings N/A Weight 74 oz (2,100 g) Environmental Protection Water Resistant Nitrogen Filled No Tripod Adaptable Yes Carrying Case Black heavy woven nylon backpack Camera Adaptable Yes Dimensions 400mm x 260mm x260mm (15.7" x 10.2" x 10.2") with include eyepiece Included Accessories Plossl 32mm eyepiece | 45° diagonal | 8x21 finderscope | Objective Lens Cover | Eyepiece Lens cap | Backpack Case
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