User's Manual

18 I ENGLISH
TECHNICAL
SPECIFICATIONS
Model # 21035
Travel Scope 70
Model # 21038
Travel Scope 50
Optical Design Refractor Refractor
Aperture 70 mm (2.8") 50 mm (2.0”)
Focal Length 400 mm 360 mm
Focal Ratio f/5.7 f/7.2
Optical Coatings Fully Coated Coated
Finderscope 5x24 2x20
Diagonal Erect Image - 45° 1.25" Erect Image .96” to 1.25” - 45°
Eyepieces 20 mm 1.25" (20x) 20 mm 1.25” (18x)
10 mm 1.25" (40x) 8 mm 1.25” (45x)
Barlow Lens – 3x 1.25” N/A Yes (60x & 135x)
Apparent Field of View 20 mm @ 50° 20 mm @ 32°
10 mm @ 50° 8 mm @ 30°
Angular Field of View 20 mm @ 2.5° 20 mm @ 1.6°
10 mm @ 1.3° 8 mm @ 0.7°
Linear Field of View --
ft/1000 yards 20 mm @ 131/44 20 mm @ 84/28
m/1000 meters 10 mm @ 67/22 8 mm @ 37/13
Near Focus w/20 mm Eyepiece 19’ (5.8 m) 15’ (4.5 m)
Mount Altazimuth (Photo Tripod) Altazimuth (Photo Tripod)
Altitude Locking Knob Yes Yes
Azimuth Locking Knob No No
Astronomy Software Download Yes Yes
Highest Useful Magnification 168x 120x
Limiting Stellar Magnitude 11.7 11.1
Resolution -- Raleigh (arc seconds) 1.98 2.66
Resolution -- Dawes Limit “ “ 1.66 2.28
Light Gathering Power 100x 51x
Optical Tube Length 17” (43 cm) 12” (30 cm)
Telescope Weight 3.3# (1.5 kg) 2.2# (1.0 kg)
Note: Specifications are subject to change without notice or obligation.