Bushnell Northstar 78-7846 Manuel utilisateur

Instruction

Manual

AUTOMATED TRACKING SYSTEM

78-7876 76mm RefLECtor

78-7846 114mm RefLECtor

Lit. #: 91-0216/03-01

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 guide to astronomy is

a must. Some recommended sources appear on our website at www.bushnell.com.

Also on our website will be current events in the sky for suggested viewing. But,

some of the standbys that you can see are:

The Moon—A wonderful view of our lunar neighbor can be enjoyed with any

magnification. Try viewing at different phases of the moon. Lunar highlands, lunar

maria (lowlands called "seas" for their dark coloration), craters, ridges and

mountains will astound you.

Saturn—Even at the lowest power you should be able to 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 from your backyard!

Jupiter—The largest planet in our solar system is spectacular. Most noted features

are its dark stripes or bands both above and below its equator. These are the north

and south equatorial belts. Also interesting are Jupiter’s four major moons. Pay

close attention to their positions from night to night. They appear to be lined up on

either side of Jupiter.

Mars—The Great Red Planet appears as a reddish-orange disk. Look at different

times of the year and try to catch a glimpse of the white polar ice caps.

Venus—Just like the moon, Venus changed phases from month to month. Some views

of brilliant Venus appear as if you were looking at a distant crescent moon.

Nebulae—The Great Orion Nebula is a very well known night sky object. This and many

others are brought to you by this telescope.

Star Clusters—View millions of stars densely packed in a cluster that resembles a ball.

Galaxies—One of the greatest and most interesting galaxies is our neighbor, the

Andromeda Galaxy. Enjoy this and many others.

Parts Diagrams

78-7876 76mm Reflector

1. Wide Field Finderscope

2. Telescope Main Tube

3. Primary Mirror (Internal)

4. Fine Adjustment Cables

5. Latitude Lock 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. Counterweight

14. Fine Adjustment Cables

15. Right Ascension Lock Knob

16. Rack and Pinion Focusing Mechanism

17. Eyepiece

18. Finderscope Mount

Telescope Parts Diagram

78-7846 114mm Reflector

Parts Diagrams (Continued)

1. Wide Field Finderscope

2. Cradles

3. Telescope Main Tube

4. Primary Mirror (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

13. Fine Adjustment Cables

14. Rack and Pinion Focusing Mechanism

15. Eyepiece

16. Finderscope Mount

Telescope Parts Diagram

78-7876 76mm

Reflector

QUICK ASSEMBLY DIAGRAM

IMPORTANT:

READ THROUGH

ASSEMBLY INSTRUCTION

BEFORE YOUASSEMBLE

YOUR TELESCOPE.

Step 4

Step 1

Step 3

Step 2

Step 5

• Adjustable Aluminum Tripod Assembly

(Three Legs)

• Quick 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

78-7846 76mm

Reflector

Step 4

Step 1

Step 3

Step 2

Step 5

DETAILEDASSEMBLY

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 Legas shown (fig. 2). and

secure Equatorial Mount to Tripod Leg. Repeat on the remaining two

Tripod Legs. Once you have attached all Tripod Legs to the mount,

securely tighten all wing nuts and place Telescope Main Tube back

into Cradles.

2. Locate the Finderscope with pre-assembled Finderscope Mount.

Remove the two nuts located near the front of the telescope (closet to

the eyepiece) and place the Finderscope and Finderscope Mount

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 Release Accessory Tray on top of braces.

2. Turn accessory tray until is snaps into place.

3. Adjust tripod leg height to suit by opening tripod leg lever and extending tripod legs to desired height.

Clamp Tripod Leg lever closed when complete.

Attach Control Cables, Counterweight and Eyepieces

1. Locate the Fine Adjustment Cable. Loosen the silver screws located at the end of the Fine Adjustment

Cable and attach the Fine Adjustment Cable to the silver post found on the Equatorial Mount.

2. Locate the Counterweight and Counterweight Shaft. Loosen the thumb screw located on the

Counterweight and slide the Counterweight onto the Counterweight Shaft, then and tighten thumb

screw to secure the Counterweight.Thread the Counterweight Shaft into the hole located directly

below the Declination Lock Knob. Make sure that the shaft is securely locked into mount.

3. Insert Eyepiece into focusing tube to begin viewing.

(fig. 2)

Never Look Directly At The Sun With

Your Telescope

Permanent Damage

To Your Eyes May Occur

❂

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 eyepiece:

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 / 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

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 earth’s axis and thus be able to locate stars in the sky based on star atlas information.

1. Set up the telescope at night. Loosen the Declination Lock Knob and rotate the telescope

around the declination axis until the arrow on the 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 the correct latitude for your area. Aim the Finderscope at Polaris.

You will probably notice that Polaris is not dead center in the Finderscope’s field of view. This

is probably because your telescope is not absolutely level with the ground. Loosen the

Horizontal Axis Lock Knob again and turn the telescope so that it is directly aimed at Polaris.

Tighten both the Horizontal Axis Lock Knob and Latitude Lock Knob. Polaris is 1 degree from

the North celestial pole. Therefore, the sighting of stars will have to be slightly adjusted as you

locate them in the heavens.

10.

HOW TO USE YOUR NEW TELESCOPE (CONTINUED)

POLAR

AXIS

LATITUDE

S S

EARTH’S AXIS

(CELESTIAL AXIS)

POLAR AXIS & EARTH’S AXIS

Ce manuel convient aux modèles suivants

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