Operation Manual

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Astro Fi TELESCOPE
SPECIFICATIONS
SKU # 22201 22202
Optical Design Refractor Maksutov-Cassegrain
Aperture 90 mm (3.5”) 102 mm (4.0”)
Focal Length 910 mm 1325 mm
Focal Ratio f/10.1 f/13
Optical Coatings Fully-coated Fully-coated
Eyepiece / Magnification 25 mm Kellner (1.25”) / 36x;
10 mm Kellner (1.25”) / 91x
25 mm Kellner (1.25”) / 53x;
10 mm Kellner (1.25”) / 132x
Finderscope StarPointer Red-Dot Finderscope StarPointer Red-Dot Finderscope
Resolution Rayleigh: 1.54 arc seconds /
Dawes Limit: 1.29 arc seconds
Rayleigh: 1.37 arc seconds /
Dawes Limit: 1.14 arc seconds
Light Gathering Power 165x the unaided eye 212x the unaided eye
Highest Useful Magnification 213x 241x
Lowest Useful Magnification 13x 15x
Limiting Stellar Magnitude 12.3 12.5
Tripod Adjustable-height aluminum Adjustable-height aluminum
Warranty 2-Years 2-Years
Optical Tube Length 37.2 inches (94.5 cm) 11 inches (27.9 cm)
Total Telescope Kit Weight
13.6 lbs 13.6 lbs
SKU # 22203
Optical Design Newtonian Reflector
Aperture 130 mm (5.1”)
Focal Length 650 mm
Focal Ratio f/5
Optical Coatings Aluminum with SiO2
Eyepiece / Magnification 25 mm Kellner (1.25”) / 26x;
10 mm Kellner (1.25”) / 65x
Finderscope StarPointer Red-Dot Finderscope
Resolution Rayleigh: 1.07 arc seconds /
Dawes Limit: 0.89 arc seconds
Light Gathering Power 345x the unaided eye
Highest Useful Magnification 307x
Lowest Useful Magnification 19x
Limiting Stellar Magnitude 13.1
Tripod Adjustable-height aluminum
Warranty 2-Years
Optical Tube Length 26 inches (66 cm)
Total Telescope Kit Weight
17.0 lbs