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AstroMaster Specifications
AstroMaster Specifications 21062 31035 31042
AM 70 EQ AM 76 EQ AM 114 EQ
Optical Design Refractor Newtonian Newtonian
Aperture 70mm (2.8") 76mm (3") 114mm (4.5")
Focal Length 900mm 700mm 1000mm
Focal Ratio f/13 f/9 f/9
Secondary Mirror Obstruction -- Dia. - Area n/a 25% - 6% 31% - 10%
Optical Coatings Fully Coated Fully Coated Fully Coated
Finderscope Star Pointer Star Pointer Star Pointer
Diagonal 1.25" Erect Image n/a n/a
Eyepieces 1.25" 20mm (45x) 20mm Erect 20mm Erect
Apparent FOV – 20mm at 50° Image (35x) Image (50x)
– 10mm at 40° 10mm (90x) 10mm (70x) 10mm (100x)
Angular Field of View w/ 20mm eyepiece 1.1° 1.4° 1.0°
Linear FOV w/20mm eyepiece -ft/1000yds 58 75 53
Mount Equatorial CG2 Equatorial CG2 Equatorial CG2
RA & DEC Setting Circles yes yes yes
RA & DEC Slow-Motion Cables yes yes yes
Tripod Leg Diameter 1.25" yes yes yes
CD-ROM "The Sky" Level 1 yes yes yes
Highest Useful Magnification 165x 180x 269x
Limiting Stellar Magnitude 11.7 11.9 12.8
Resolution -- Raleigh (arc seconds) 1.98 1.82 1.21
Resolution -- Dawes Limit " " 1.66 1.53 1.02
Light Gathering Power 100x 118x 265x
Optical Tube Length 36" (91cm) 26" (66cm) 20" (51cm)
Telescope Weight 18 lbs. (8.2kg) 16 lbs. (7.3kg) 17 lbs. (7.7kg)
Note: Specifications are subject to change without notice or obligation
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