Harga Celestron C8-A XLT ( CGE) Optical Tube Assembly

OVERVIEW 8" Schmidt-Cassegrain Optical Tube Assembly Aluminum Optical Tube Celestron' s premium StarBright XLT coatings 2032 mm focal length ( f/ 10) 25 mm eyepiece included ( 81x) Visual back allows for use with 1.25" accessories 6x30 finderscope to help accurately find objects Star diagonal provides more comfortable viewing position when observing objects that are high in the sky Includes dovetail rail compatible with CGE mount ITEM # 91024-XLT IN STOCK Description General Features 8" Schmidt-Cassegrain Optical Tube Assembly Aluminum Optical Tube Celestron' s premium StarBright XLT coatings 2032 mm focal length ( f/ 10) 25 mm eyepiece included ( 81x) Visual back allows for use with 1.25" accessories 6x30 finderscope to help accurately find objects Star diagonal provides more comfortable viewing position when observing objects that are high in the sky Includes dovetail rail compatible with CGE mount Specifications Optical Design Schmidt-Cassegrain Aperture ( mm) 203.2 mm ( 8 in) Focal Length 2032 mm ( 80 in) Focal Ratio 10 Focal Length of Eyepiece 1 ( mm) 25 mm ( 0.98 in) Magnification of Eyepiece 1 81 x Finderscope 6x30 Star Diagonal 1.25 Optical Tube Aluminum Highest Useful Magnification 480 x Lowest Useful Magnification 29 x Limiting Stellar Magnitude 14 Resolution ( Rayleigh) 0.69 arc seconds Resolution ( Dawes) 0.57 arc seconds Light Gathering Power ( Compared to human eye) 843 x Secondary Mirror Obstruction 2.5 in ( 64 mm) Secondary Mirror Obstruction by Diameter 31% Secondary Mirror Obstruction by Area 9.77% Optical Coatings StarBright XLT Optical Tube Length 17 in ( 432 mm) Optical Tube Weight 12.5 lbs ( 5.67 kg) Dovetail Compatibility CGE Mount Technology StarBright XLT Warranty 2 Years