Operation Manual

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