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26
FIRSTSCOPE SERIES
SPECIFICATIONS
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FirstScope 21052 21067 21076 31032
Models FirstScope 60AZ FirstScope 60EQ FirstScope 70EQ FirstScope 76 EQ
Specifications
Optical Design Refractor Refractor Refractor Reflector
Aperture 60mm (2.4") 60mm (2.4") 70mm (2.8") 76mm (3")
Focal Length/Ratio 700mm F/12 900mm F/15 900mm F/13 700mm F/9
Finderscope StarPointer StarPointer StarPointer StarPointer
Mount Altazimuth Equatorial Equatorial Equatorial
Eyepiece 20mm (35X) 20mm (45x) 20m (45x) 20mm (35x)
Eyepiece 10mm (70X) 10mm (90x) 10mm (90x) 10mm (70x)
Star Diagonal / Erect Image Eyepiece 1.25" / 1.5x E.I. Eyepiece 1.25" 90º 1.25" 90º n/a
Accessory Tray Round, Thread-in Round, Thread-in Round, Thread-in Round, Thread-in
Tripod Aluminum Aluminum Aluminum Aluminum
CD ROM The Sky L1 The Sky L1 The Sky L1 The Sky L1
Technical Specifications
Highest Useful Magnification 142x 142x 165x 180x
Limiting Stellar Magnitude 11.4 11.4 11.7 11.9
Resolution: Rayleigh 2.31 arc seconds 2.31 arc seconds 1.98 arc seconds 1.82 arc seconds
Dawes Limit 1.93 arc seconds 1.93 arc seconds 1.66 arc seconds 1.53 arc seconds
Light Gathering Power 73x unaided eye 73x unaided eye 100x unaided eye 118x unaided eye
Field of View: standard eyepiece 1.20º .90º .90º 1.20º
Linear FOV (@1000 yds) 75 ft. 58 ft 48 ft 62 ft.
Secondary Mirror Obstruction n/a n/a n/a .75" (25% by diameter, 6% by area)
Optical Coatings Fully Coated Fully Coated Fully Coated Aluminum
Optical Tube Length 28 inches 30 inches 30 inches 27 inches
Telescope Weight 7 lbs 11 lbs 17 lbs 15 lbs
FirstScope 21084 21085 31041 31044
Models FirstScope 90AZ FirstScope 90EQ FirstScope 114 Compact FirstScope 114
Specifications
Optical Design Refractor Refractor Reflector Reflector
Aperture 90mm (3.5") 90mm (3.5") 114mm (4.5") 114mm (4.5")
Focal Length 1000mm F/11 1000mm F/11 1000mm F/9 900mm F/8
Finderscope StarPointer StarPointer StarPointer StarPointer
Mount Altazimuth Equatorial Equatorial Equatorial
Eyepiece 20mm (50x) 20mm (50x) 20mm (50x) 20mm (45x)
Eyepiece 10mm (100x) 10mm (100x) 10mm (100x) 10mm (90x)
Star Diagonal / Erect Image Eyepiece 1.25" 45º Erect Image 1.25" 90º n/a n/a
Accessory Tray Round, Thread-in Round, Thread-in Round, Thread-in Round, Thread-in
Tripod Aluminum Aluminum Aluminum Aluminum
CD ROM The Sky L1 The Sky L1 The Sky L1 The Sky L1
Technical Specifications
Highest Useful Magnification 213x 213x 269x 269x
Limiting Stellar Magnitude 12.3 12.3 12.8 12.8
Resolution: Rayleigh 1.54 arc seconds 1.54 arc seconds 1.21 arc seconds 1.21 arc seconds
Dawes Limit 1.29 arc seconds 1.29 arc seconds 1.02 arc seconds 1.02 arc seconds
Light Gathering Power 165x unaided eye 165x unaided eye 265x unaided eye 265x unaided eye
Field of View: standard eyepiece .80º .80º .80º .90º
Linear FOV (@1000 yds) 43 ft. 43 ft. 43 ft. 48 ft.
Secondary Mirror Obstruction n/a n/a 1.4" (31% by diameter, 10% by area) 1" (22% by diameter, 5% by area)
Optical Coatings Multi-Coated Multi-Coated Aluminum Aluminum
Optical Tube Length 40 inches 40 inches 20 inches 34 inches
Telescope Weight 19 lbs 22 lbs 16 lbs 19 lbs
Specifications are subject to change without notice or obligation.
FirstScope 60 • Moon • Image courtesy of Klaus Modinger
FirstScope 60 • Moon • Image courtesy of Klaus Modinger
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