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Never Look Directly  At  The  Sun  Wi t h

Your  Telescope 

Permanent  Damage 

To  Your  Eyes May Occur

9.

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  f o c a l   l e n g t h   d i v i d e d   b y   E Y E P I E C E   focal length  =
MAGNIFICATION (e.g. Using the 20 mm lens, a sample calculation would look like this:
750 mm / 20mm = 38x or 38 power. Telescope models will vary in focal length).

2.    Included with this telescope is a Barlow lens. Barlow lenses are used to double or triple the

power of your telescope. Place your Barlow between the focusing tube and the eyepiece.
Using the example above, your 3x Barlow lens would give you a total power of 114x or
114 power. (38 x 3 = 114x or 114 power).  The magnification calculation would look like this:
750 mm/ 20mm =38 power.  38 power x 3 = 114 power.

Focusing Telescope

1.    After selecting the desired eyepiece, aim main telescope tube at a land-based target at least

200 yards away (e.g. a telephone pole or building). 

2.   Fully extend focusing tube by turning Rack and Pinion Focusing Mechanism.

3.    While looking through selected eyepiece (in this case the 20 mm), slowly retract focusing tube

by turning Rack and Pinion Focusing Mechanism until object comes into focus.

Aligning Finderscope

1.  Look through Main Telescope Tube and establish a well-defined target. (see Focusing

Telescope section) 

2.  Looking through Wide Field Finderscope, alternate tightening each Finderscope Adjustment

Screw until crosshairs of Wide Field Finderscope are precisely centered on the same object
already centered in Main Telescope Tube's  field of view.

3.    Now, objects located first with the Wide Field Finderscope will be centered in the field of view

of the main telescope.

HOW TO USE YOUR NEW TELESCOPE

Summary of Contents for Northstar 78-7846

Page 1: ...Instruction Manual AUTOMATED TRACKING SYSTEM 78 7876 76mm RefLECtor 78 7846 114mm RefLECtor Lit 91 0216 03 01...

Page 2: ...2...

Page 3: ...see Saturn s rings and moons This is one of the most satisfying objects in the sky to see simply because it looks like it does in pictures Imagine seeing what you ve seen in textbooks or NASA images f...

Page 4: ...ck Knob 6 Horizontal Axis Lock Knob 7 Tripod Leg 8 Accessory Tray Brace 9 Quick Release Accessory Tray 10 Quick Release Tripod Leg Lever 11 Declination Lock Knob 12 Counterweight Shaft 13 Counterweigh...

Page 5: ...rror Internal 5 Latitude Lock Knob 6 Tripod Leg 7 Accessory Tray Brace 8 Quick Release Accessory Tray 9 Quick Release Tripod Leg Lever 10 Declination Lock Knob 11 Counterweight Shaft 12 Counterweight...

Page 6: ...78 7876 76mm Reflector QUICK ASSEMBLY DIAGRAM 6 IMPORTANT READ THROUGH ASSEMBLY INSTRUCTION BEFORE YOU ASSEMBLE YOUR TELESCOPE Step 4 Step 1 Step 3 Step 2 Step 5...

Page 7: ...Release Accessory Tray Reflector Telescope Assembly Equatorial Mount Wide Field Finderscope 20mm 1 25 Diameter Eyepiece 4mm 1 25 Diameter Eyepiece Barlow Lens PARTS LIST QUICK ASSEMBLY DIAGRAM 7 78 7...

Page 8: ...ount over the exposed screws Replace the nuts and securely tighten the Finderscope and Finderscope Mount in place Attach Accessory Tray 1 Fold down the accessory tray braces and place the Quick Releas...

Page 9: ...of 114x or 114 power 38 x 3 114x or 114 power The magnification calculation would look like this 750 mm 20mm 38 power 38 power x 3 114 power Focusing Telescope 1 After selecting the desired eyepiece a...

Page 10: ...he declination scale points to 90 degrees Tighten the Declination Lock Knob 2 Look up the latitude of your area in any geographical atlas Loosen the Latitude Lock Knob and set the latitude scale to th...

Page 11: ...grams 1 ATS Motor Housing 2 ATS Drive Shaft set screw 3 ATS Drive Shaft 4 Gear Coupler 5 Plastic Adapter 6 Fine Adjustment Cable 7 Gear coupler set screw 8 Plastic Adapter set screw 9 Right ascension...

Page 12: ...s Continued 1 ATS Motor Housing 2 ATS Drive Shaft set screw 3 ATS Drive Shaft 4 Gear Coupler 5 Plastic Adapter 6 Fine Adjustment Cable 7 Gear coupler set screw 8 Plastic Adapter set screw 9 Right asce...

Page 13: ...tem are outlined below AUTOTRACK By pushing this button you activate the Automated Tracking System and your telescope begins to move with the night sky Push and hold this button to turn the unit off T...

Page 14: ...be easily found in the main telescope tube which is important for continuing your exploration of the night sky 3 The low power eyepieces are perfect for viewing the full moon planets star clusters neb...

Page 15: ...n the city 3 Using your telescope out a window is NEVER recommended 4 View objects that are high in the sky if possible Waiting until the object rises well above the horizon will provide a brighter an...

Page 16: ...over damages caused by misuse or improper handling installation or maintenance of the product Any return made under this warranty must be accompanied by the items listed below 1 A check in the amount...

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