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Lit. #: 91-0216/03-01
AUTOMATED TRACKING SYSTEM
78-7876 76mm RefLECtor
Instruction
78-7846 114mm RefLECtor
Manual
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WHERE DO I START? Your Bushnell telescope can bring the wonders of the universe to your eye. While this manual is intended to assist you in the set-up and basic use of this instrument, it does not cover everything you might like to know about astronomy. Although Northstar will give a respectable tour of the night sky, it is recommended you obtain a very simple star chart and a flashlight with a red bulb or red cellophane over the end. For objects other than stars and constellations, a basic gui
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Parts Diagrams 78-7876 76mm Reflector Telescope Parts Diagram 1. Wide Field Finderscope 10. Quick-Release Tripod Leg Lever 2. Telescope Main Tube 11. Declination Lock Knob 3. Primary Mirror (Internal) 12. Counterweight Shaft 4. Fine Adjustment Cables 13. Counterweight 5. Latitude Lock Knob 14. Fine Adjustment Cables 6. Horizontal Axis Lock Knob 15. Right Ascension Lock Knob 7. Tripod Leg 16. Rack and Pinion Focusing Mechanism 8. Accessory Tray Brace 17. Eyepiece 9. Quick-Releas
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Parts Diagrams (Continued) 78-7846 114mm Reflector Telescope Parts Diagram 1. Wide Field Finderscope 9. Quick-Release Tripod Leg Lever 2. Cradles 10. Declination Lock Knob 3. Telescope Main Tube 11. Counterweight Shaft 4. Primary Mirror (Internal) 12. Counterweight 5. Latitude Lock Knob 13. Fine Adjustment Cables 6. Tripod Leg 14. Rack and Pinion Focusing Mechanism 7. Accessory Tray Brace 15. Eyepiece 8. Quick-Release Accessory Tray 16. Finderscope Mount 5.
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QUICK ASSEMBLY DIAGRAM 78-7876 76mm Reflector Step 4 Step 5 Step 1 Step 3 Step 2 I M P O RTA N T: READ THROUGH A S S E M B L Y INSTRUCTION BEFORE YOU A S S E M B L E YOUR T E L E S C O P E . 6.
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QUICK ASSEMBLY DIAGRAM 78-7846 76mm Reflector Step 4 Step 5 Step 1 Step 3 Step 2 PARTS LIST • Adjustable Aluminum Tripod Assembly • Wide Field Finderscope (Three Legs) • 20mm 1.25" Diameter Eyepiece • Quick Release Accessory Tray • 4mm 1.25" Diameter Eyepiece • Reflector Telescope Assembly • Barlow Lens • Equatorial Mount 7.
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DETAILED ASSEMBLY Remove all components from the carton and identify all components. READ THROUGH ASSEMBLY INSTRUCTION BEFORE YOU ASSEMBLE YOUR TELESCOPE. Attach Telescope and Finderscope 1. Locate the pre-assembled Telescope Main Tube and Equatorial Mount. Note: Before assembling tripod legs to Equatorial Mount, make sure the Accessory Tray Braces face inward. Loosen long bolts at the top ofTripod Leg. Carefully remove Telescope Main Tube from Cradles. Position the mount over the Tripod Leg as
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HOW TO USE YOUR NEW TELESCOPE Selecting an Eyepiece 1. You should always start viewing with the lowest power eyepiece, which in this case is the 20 mm lens. Note: the base power of each eyepiece is determined by the focal length of the telescope objective lens. A formula can be used to determine the power of each e y e p i e c e : telescope OBJECTIVE lens focal length divided by EYEPIECE focal length = MAGNIFICATION (e.g. Using the 20 mm lens, a sample calculation would look like this: 750 mm /
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HOW TO USE YOUR NEW TELESCOPE (CONTINUED) Understanding the Equatorial Mount The Equatorial Mount is designed to move in any direction. It can be set to allow manual controls to track the movements of celestial bodies across the sky. This is referred to as diurnal movement: movement of celestial bodies in the direction opposite to that of the earth’s rotation and around the earth’s axis. By aligning the telescope’s polar axis at celestial North, you will place the telescope in parallel with the
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Parts Diagrams 78-7876 76mm Reflector Telescope Parts Diagram 1. ATS Motor Housing 6. Fine Adjustment Cable 2. ATS Drive Shaft – set screw 7. Gear coupler – set screw 3. ATS Drive Shaft 8. Plastic Adapter – set screw 4. Gear Coupler 9. Right ascension axis shaft 5. Plastic Adapter 11.
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Parts Diagrams (Continued) 78-7846 114mm Reflector Telescope Parts Diagram 1. ATS Motor Housing 6. Fine Adjustment Cable 2. ATS Drive Shaft – set screw 7. Gear coupler – set screw 3. ATS Drive Shaft 8. Plastic Adapter – set screw 4. Gear Coupler 9. Right ascension axis shaft 5. Plastic Adapter 12.
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AUTOMATED TRACKING SYSTEM INSTALLATION 1. Mount the plastic adapter on the mount as shown. Please note your telescope model number and refer to the appropriate diagram. Tighten set screw. 2. Using the fine adjustment cable, rotate shaft until the flat side of shaft is visible through the opening in the side of the plastic adapter. 3. Attach gear coupler to shaft as shown and tighten set screw. 4. Using the fine adjustment cable, rotate shaft until the flat side of the gear coupler cavity matches
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M ENJOYING YOUR NEW TELESCOPE 1. First determine your targeted object. Any bright object in the night sky is a good starting point. One of the favorite starting points in astronomy is the moon. This is an object sure to please any budding astronomer or experienced veteran. When you have developed proficiency at this level, other objects become good targets. Saturn, Mars, Jupiter, and Venus are good second steps to take. 2. The first thing you need to do after assembling the telescope as plann
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M HELPFUL HINTS 1 . Your telescope is a very sensitive instrument. For best results and fewer vibrations set your telescope up on a level location on the ground rather than your concrete driveway or your wooden deck. This will provide a more stable foundation for viewing, especially if you’ve drawn a crowd with your new telescope. 2. If possible view from a location that has relatively few lights. This will allow you to see much fainter objects. You’d be surprised how much more you’ll see from
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WARRANTY / REPAIR TELESCOPE LIFETIME LIMITED WARRANTY ® Your Bushnell telescope is warranted to be free of defects in materials and workmanship for the lifetime of the original owner. The Lifetime Limited Warranty is an expression of our confidence in the materials and mechanical workmanship of our products and is your assurance of a lifetime of dependable service. If your telescope contains electrical components the electronic components are warranted to be free of defects in materials and work
