About the Celestron C90 MAK Spotting Scope... The Celestron Spotting Scope 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 Celestron C90 Mak Spotting Scope has excellent optics with razor sharp images over a wide field. Celestron C90 MAK Spotting Scope 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 Degree Erect Image Diagonal and 8x21 Erect Image Finderscope Backpack Made of Nylon Limited Lifetime Warranty "The C90 Mak is a fantastic grab-n-go scope for astronomy. The scope comes with a factory installed vixen style mount for astro mounts, but is also tapped for use with a photo tripod providing the ultimate in flexibility. The unit provides tack sharp images and is great for lunar and planetary viewing. For astro use, I replaced the 45 degree prism with a 90 degree optional star diagonal to maximize performance. The scope is so light that when mounted to my photo tripod and video head, I can carry the whole set up outside in one trip. 90mm aperture provides enough light gathering for planetary and lunar viewing while keeping cool down time to a minimum." Celestron C90 MAK Spotting Scope Specifications... Optical Design: Maksutov-Cassegrain Aperture (mm): 90 mm (3.54 in) Focal Length (mm): 1250 mm (49 in) Focal Ratio: 14 Angle: 0 or 45 degrees Eyepiece 1 (mm): 32 mm (1.26 in) Magnification 1: 39 x Finderscope: 8x21 Carrying Case: Backpack made of nylon Highest Useful Magnification: 213 x Lowest Useful Magnification: 13 x Limiting Stellar Magnitude: 12.3 Resolution (Rayleigh): 1.55 arc seconds Resolution (Dawes): 1.29 arc seconds Light Gathering Power (Compared to human eye): 165 x Angular Field of View (deg): 1.3 degrees Linear Field of View (@1000 yds): 68 ft (21 m) Linear Field of View (@1000 m): 23 m (75 ft) Eye Relief (mm): 20 mm (0.79 in) Near Focus (Binoculars): 15 ft (4.57 m) Optical Coatings: Multi-Coated Optical Tube Length: 16 in (406 mm) Weight (lbs): 5 lbs (2.27 kg) Camera Adaptable: Optional T-Adapter Tripod Adaptable: Yes Celestron Product Number: 52268
