Harga Celestron C11-A XLT ( CG-5) Optical Tube Assembly

OVERVIEW 11" Schmidt-Cassegrain Optical Tube Assembly Aluminum Optical Tube Celestron' s premium StarBright XLT coatings 2800 mm focal length ( f/ 10) 40 mm eyepiece included ( 70x) Visual back allows for use with 1.25" accessories 9x50 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 # 91067-XLT IN STOCK Description General Features 11" Schmidt-Cassegrain Optical Tube Assembly Aluminum Optical Tube Celestron' s premium StarBright XLT coatings 2800 mm focal length ( f/ 10) 40 mm eyepiece included ( 70x) Visual back allows for use with 1.25" accessories 9x50 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) 279.4 mm ( 11 in) Focal Length 2800 mm ( 110 in) Focal Ratio 10 Focal Length of Eyepiece 1 ( mm) 40 mm ( 1.57 in) Magnification of Eyepiece 1 70 x Finderscope 9x50 Star Diagonal 1.25 Optical Tube Aluminum Highest Useful Magnification 660 x Lowest Useful Magnification 40 x Limiting Stellar Magnitude 14.7 Resolution ( Rayleigh) 0.5 arc seconds Resolution ( Dawes) 0.42 arc seconds Light Gathering Power ( Compared to human eye) 1593 x Secondary Mirror Obstruction 3.75 in ( 95 mm) Secondary Mirror Obstruction by Diameter 34% Secondary Mirror Obstruction by Area 12% Optical Coatings StarBright / XLT Optical Tube Length 24 in ( 610 mm) Optical Tube Weight 27.5 lbs ( 12 kg) Dovetail Compatibility CG-5 Mount Technology StarBright XLT