Harga Celestron C9 1/ 4-A XLT ( CG-5) Optical Tube Assembly

OVERVIEW 9.25" Schmidt-Cassegrain Optical Tube Assembly Aluminum Optical Tube Celestron' s premium StarBright XLT coatings 2350 mm focal length ( f/ 10) 25 mm eyepiece included ( 94x) 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 CG-5 Advanced Series mount ITEM # 91025-XLT IN STOCK Description General Features 9.25" Schmidt-Cassegrain Optical Tube Assembly Aluminum Optical Tube Celestron' s premium StarBright XLT coatings 2350 mm focal length ( f/ 10) 25 mm eyepiece included ( 94x) 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 CG-5 Advanced Series mount Specifications Optical Design Schmidt-Cassegrain Aperture ( mm) 234.95 mm ( 9.25 in) Focal Length 2350 mm ( 93 in) Focal Ratio 10 Focal Length of Eyepiece 1 ( mm) 25 mm ( 0.98 in) Magnification of Eyepiece 1 94 x Finderscope 6x30 Star Diagonal 1.25 Optical Tube Aluminum Highest Useful Magnification 555 x Lowest Useful Magnification 34 x Limiting Stellar Magnitude 14.4 Resolution ( Rayleigh) 0.59 arc seconds Resolution ( Dawes) 0.49 arc seconds Light Gathering Power ( Compared to human eye) 1127 x Secondary Mirror Obstruction 3.35 in ( 85 mm) Secondary Mirror Obstruction by Diameter 36% Secondary Mirror Obstruction by Area 13% Optical Coatings StarBright / XLT Optical Tube Length 22 in ( 559 mm) Optical Tube Weight 20 lbs ( 9.07 kg) Dovetail Compatibility CG-5 Mount Technology StarBright XLT Warranty 2 Years