Optical Design |
Refractor |
Aperture |
102mm (4.01") |
Focal Length |
660mm (25.98") |
Focal Ratio |
f/6.5 |
Focal Length of Eyepiece 1 |
25mm (0.98") |
Magnification of Eyepiece 1 |
26x |
Focal Length of Eyepiece 2 |
10mm (0.39") |
Magnification of Eyepiece 2 |
66x |
Barlow Lens |
None |
Finderscope |
StarPointer™ red dot finderscope |
Star Diagonal |
Erect image 90° (1.25") |
Optical Tube |
Aluminum |
Highest Useful Magnification |
240x |
Lowest Useful Magnification |
15x |
Limiting Stellar Magnitude |
12.5 |
Resolution (Rayleigh) |
1.37 arc seconds |
Resolution (Dawes) |
1.14 arc seconds |
Light Gathering Power (Compared to human eye) |
212x |
Optical Coatings |
Fully XLT Coated glass optics |
Optical Tube Length |
812.8mm (32") |
Optical Tube Diameter |
118mm (4.64") |
Optical Tube Weight |
5 lbs (2.26 kg) |
Dovetail |
CG-5 Dovetail Bar |