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FirstScope w/Accessory Kit


Item #: 21024-A



Optical Tube Info:
Optical Design: Newtonian Reflector
Aperture: 76mm (2.99")
Focal Length: 300mm (12")
Focal Ratio: f/3.95
Focal Length of Eyepiece 1: 20mm (0.79")
Magnification of Eyepiece 1: 15x
Focal Length of Eyepiece 2: 4mm (0.16")
Magnification of Eyepiece 2: 75x
Barlow Lens: Not Included
Finderscope: Not Included
Star Diagonal: Not Included
Optical Tube: Plastic
Highest Useful Magnification: 180x
Lowest Useful Magnification: 11x
Limiting Stellar Magnitude: 11.9
Resolution (Rayleigh): 1.83 arc seconds
Resolution (Dawes): 1.53 arc seconds
Light Gathering Power (Compared to human eye): 118x
Secondary Mirror Obstruction: 28mm (1.1")
Secondary Mirror Obstruction by Diameter: 37%
Secondary Mirror Obstruction by Area: 14%
Optical Coatings: Aluminum with SiO2
Optical Tube Length: 266mm (10.5")
Optical Tube Diameter: 95.25mm (3.75")
Optical Tube Weight: 1.4 lbs (0.64 kg)
Dovetail: N/A
Mount Info:
Mount Type: Manual Tabletop Dobsonian
Height adjustment range (includes mount and tripod): N/A
Tripod Leg Diameter: N/A
Slew Speeds: Manual
Tripod Weight: N/A
Dovetail Compatibility: N/A
Software: Celestron Starry Night Basic Edition Software, and SkyPortal App
Total Kit Weight: 4.3 lbs (1.95 kg)
Included Items: Optical tube
Dobsonian Mount
10mm and 20mm Eyepieces