CONTENTS
Introduction 5
The Basic Model 2080 Telescope: Standard Equipment 5
The Basic Model 2120 Telescope: Standard Equipment 6
Setting Up the Model 2080 6
Assembly and Set-up of the Model 2120 8
Telescope Op~ration: Your First Observations 10
Focusing 12
Magnifications 12
Viewfinder: Model 2080 15
Viewfinder: Model 2120 16
Field Tripod 17
Equatorial Wedge 20
Mounting the Telescope onto the Wedge 23
Celestial Coordinates 24
Lining Up with the Celestial Pole 25
Precise Polar Alignment . 28
Polar Alignment at Low Latitudes 30
Electric Motor Drive 30
Setting Circles _ 31
Observing with the Telescope 32
Optional Accessories and Systems
Eyepieces (l~flO.D.) 34
Eyepieces (2" O.D.) 34
Barlow Lenses 34
2" Diagonal Mirror 35
Thread-in Color Filters 35
Series -6 Color Filters 37
Erecting Prism 39
8 x 50mm Right-Angle Viewfinder for Model~ 2080 39
Nebular Filters 39
Solar Filters 40
Wide-Field Adapter System (WFAS) 41
Dew Shield 41
Accessory Shelf 42
Altazimuth Adapter 42
Photographic Accessories
T-Adapter 44
Tele-Extender 47
Guided Astrophotography 48
Piggyback Camera Bracket 49
Off-Axis Guider 50
Telecompressor- 51
Tube Balance Weight System 52
Cleaning the Optics 52
Alignment (Collimation) of the Optical System 54
Dewing of the Correcting Plate 56
Adjusting the Right-Ascension Lock 57
Adjusting the Declination Lock 57
A Note on the "Flashlight" Test 58
Factory Servicing and Repairs 58
Basic Specifications: Model 2080 58
Basic Specifications: Model 2120 60
Optical Reference Information 61
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