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21064 & 21069 31045 & 31051
AM 90 EQ AM 130 EQ
Optical Design Refractor Newtonian
Aperture 90mm (3.5") 130mm (5")
Focal Length 1000mm 650mm
Focal Ratio f/11 f/5
Secondary Mirror Obstruction -- Dia. - Area n/a 31% - 10%
Optical Coatings Multi-Coated Fully Coated
Finderscope Star Pointer Star Pointer
Diagonal 1.25" Erect Image n/a
Eyepieces 1.25" 20mm (50x) 20mm Erect
Apparent FOV -- 20mm at 50° Image (33x)
-- 10mm at 40° 10mm (100x) 10mm (65x)
Angular Field of View w/20mm eyepiece 1.0° 1.5°
Linear FOV w/20mm eyepiece -ft/1000yds 53 79
Mount Equatorial CG3 Equatorial CG3
RA & DEC Setting Circles yes yes
RA & DEC Slow-Motion Cables yes yes
Tripod Leg diameter 1.25" yes yes
CD-ROM "The Sky" Level 1 yes yes
Highest Useful Magnification 213x 306x
Limiting Stellar Magnitude 12.3 13.1
Resolution -- Raleigh (arc seconds) 1.54 1.06
Resolution -- Dawes Limit " " 1.29 0.89
Light Gathering Power 165x 345x
Optical Tube Length 36" (91cm) 24" (61cm)
Telescope Weight 27 lbs. (12.2kg) 28 lbs. (12.7kg)
Note: Specifications are subject to change without notice or obligation
Note: # 21069 & # 31051 include a Motor Drive
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