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21 I
AstroMaster Specications
21063
AM 90 AZ
Optical Design Refractor
Aperture 90 mm (3.5”)
Focal Length 1000 mm
Focal Ratio f/11
Secondary Mirror Obstruction -- Dia. - Area n/a
Optical Coatings Multi-coated
Finderscope Star Pointer
Diagonal 1.25” Erect Image
Eyepieces 1.25” 20 mm (50x)
Apparent FOV -- 20mm @ 50°
-- 10mm @ 40° 10 mm(100x)
Angular Field of View w/standard eyepiece 1.0°
Linear FOV w/standard eyepiece -ft/1000yds 53
Mount Altazimuth
Pan Handle Control for Altitude yes
Azimuth Lock yes
Tripod Leg Diameter 1.25” yes
TheSkyX-First Light Edition software yes
Highest Useful Magnification 210x
Limiting Stellar Magnitude 12.3
Resolution -- Raleigh (arc seconds) 1.55
Resolution -- Dawes Limit “ “ 1.29
Light Gathering Power 165x
Optical Tube Length 36” (91cm)
Telescope Weight 20 # (9kg)
Note: Specifications are subject to change without notice or obligation.
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