Bushnell 78-9675 User's Manual
Contents
1. TROUBLESHOOTING GUIDE If after you have set up your new telescope you are unable to see any objects use this Quick Reference guide to help you to understand the cause of the problem and quickly determine a remedy I ve completed the set up yet I cannot see anything e Try to view an object that is 200 or more yards away e If there is more than one eyepiece included with the telescope use the lowest power highest number eyepiece to begin viewing e Use the Rack amp Pinion Focusing Mechanism 3 to bring the object you are trying to view into focus Telescope LIFETIME LIMITED WARRANTY Your 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 workmanship for one year after the date of purchase In the event of a defect under this warranty we will at our option repair or replace the product provided that you return the product postage prepaid This warranty does not cover 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 i2. Before assembling tripod legs to Equatorial Mount make sure the Accessory Tray Braces 9 face inward Loosen long bolts at the top of Tripod Leg 12 Carefully remove Telescope Main Tube from Cradles 25 Position the mount over the Tripod Leg as 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 Locate the Finderscope 1 with pre assembled Finderscope Mount 2 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 The Finderscope Focus Adjustment 16 should point towards the Primary Mirror 14 Replace the nuts and securely tighten the Finderscope and Finderscope Mount in place 1 Attach Accessory Tray e Locate the Accessory Tray 10 Using the accessory tray bolts wingnuts and washers connect the Accessory Tray to the Accessory Tray Braces 9 Start with one tripod leg and attach wingnuts Wingnuts should be positioned beneath the accessory tray Do not tighten wingnuts until all Accessory Tray Braces are attached as some adjustments may be required 2 Attach Control Cables Counterweight and Eyepieces e Locate the Fine Adjustment Cables 5 Loosen the silver screws located at the end of the Fine Adjustment Cables and attach the Fine Adjustment
3. Cables to the two silver posts found on the Equatorial Mount The first post is located just above the Declination Lock Knob 18 the second post is located below the Right Ascension Scale 24 Locate the Counterweight 6 and Counterweight Shaft 7 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 18 Make sure that the shaft is securely locked into mount Insert Eyepiece 4 into focusing tube to begin viewing Your Bushnell Voyager Telescope is now ready to be used To obtain the fullest enjoyment from your telescope please refer to the additional information below HOW TO USE YOUR NEW TELESCOPE Astronomical telescopes are designed in such a way that the image you will see appear UPSIDE DOWN and REVERSED this is acceptable for viewing celestial bodies 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 which for this model is 900 mm A formula can be used to determine the power of each eyepiece telescope OBJECTIVE lens focal length EYEPIECE focal length MAGNIFICATION e g Using the 20 mm lens the calculation would look like thi
4. DON Cre CON ee IESSE 675 x 4 5 Reflector Telescope Model 78 9675 d Finderscope Finderscope Mount Rack amp Pinion Focusing Mechanism Eyepiece Fine Adjustment Cables 2 Counterweight Counterweight Shaft Tripod Leg Middle Section Accessory Tray Brace Accessory Tray Tripod Leg Lock Screws Tripod Leg E L Horizontal Axis Lock Primary Mirror Internal Telescope Main Tube Finderscope Focus Adjustme Finderscope Adjustment Screws 3 Declination Lock Knob Declination Scale Equatorial Mount Right Ascension Lock Knob Latitude Lock Knob Latitude Scale Right Ascension Scale Cradles STANDARD EQUIPMENT e Reflector Telescope Assembly e Equatorial Mount e Variable Height Heavy Duty Aluminum Tripod e 4mm 12mm 20mm focal length 1 25 Eyepieces e 5x24 mm Finderscope wl focus adjustment e 3x Barlow e Accessory tray 3 3 4 bolts 6 1 2 washers 3 wingnuts TELESCOPE ASSEMBLY es 1 Remove all components from the carton and identify all components READ THROUGH ASSEMBLY INSTRUCTION BEFORE YOU ASSEMBLE YOUR TELESCOPE 2 Set Up Tripod e Select one tripod leg Loosen Tripod Leg Lock Screw 11 and extend the Tripod Leg Middle Section 8 Tighten the Tripod Leg lock Screw so that the Middle Section is securely in place Repeat for the remaining two legs 3 Attach Telescope and Finderscope e Locate the pre assembled Telescope Main Tube 15 and Equatorial Mount 20 Note
5. l have to be slightly adjusted as you locate them in the heavens Never Look Directly At The Sun With Your Telescope Permanent Damage To Your Eyes May Occur 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 Avoid the temptation to move directly to the highest power The low power eyepiece will give you a wider field of view and brighter image thus making it very easy to find your target object At this point with a focused image you ve passed the first obstacle Once you pass this step you ll will enjoy the time spent with your telescope Every celestial object you center in the telescope will be easily focused 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 nebulae and even constellations These should build your foundation However for more detail try bumping up in magnification to higher power eyepieces on some of these objects During calm and crisp nights the light dark separation line on the moon called the Terminator is marvelous at high power You ca
6. n see mountains ridges and craters jump out at you due to the highlights Similarly you can move up to higher magnifications on the planets and nebulae Star clusters and stars are best viewed through the low power no matter what 4 The recurring astronomical theater we call the night sky is an ever changing billboard In other words not the same movie plays all the time Rather the positions of the stars change not only hourly as they seem to rise and set but also throughout the year As the earth orbits the sun our perspective on the stars changes on a yearly cycle about that orbit The reason the sky seems to move daily just as the sun and the moon move across our sky is that the earth is rotating about its axis As a result you may notice that after a few minutes or a few seconds depending on what power you are viewing at the objects in your telescope will move At higher magnifications especially you will notice that the moon or Jupiter will race right out of the field of view To compensate just move your telescope to track it in the necessary path Helpful Hints 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 If possible view from a location that has relatively few ligh
7. n the amount of 15 00 to cover the cost of handling 2 Name and address for product return 3 An explanation of the defect 4 Product should be well packed in a sturdy outside shipping carton to prevent damage in transit and return postage prepaid to the address listed below IN U S A Send To Bushnell 8500 Marshall Drive Lenexa Kansas 66214 IN CANADA Send To Bushnell 25A East Pearce Street Unit 1 Richmond Hill Ontario L4B 2M9 For products purchased outside the United States and Canada please contact your local dealer for applicable warranty information This warranty gives you specific legal rights You may have other rights which vary from country to country 2001 Bushnell Performance Optics
8. ound 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 To compensate for your position on earth the polar axis is set in one of three ways Arrange the telescope so that the telescope body is horizontal to the floor latitude of 0 Loosen the Right Ascension Lock 21 The telescope should now turn freely about the polar axis Rotate the telescope about the polar axis so that the Counterweight Shaft 7 is parallel to the ground horizontal 2 Loosen the Counterweight Lock Screw located on the counterweight and slide the Counterweight 6 along the shaft until the telescope remains stationary without drifting rotationally about the polar axis Tighten the Counterweight Lock Screw locking the Counterweight into position 3 Now balance the telescope about the Declination Axis Loosen the Declination Lock Screw 18 and the Cradle Lock Knobs fig 3 so that the telescope can slide freely inside the Cradles 25 Slide the telescope up or down inside the rings until the telescope remains stationary without drifting rotationally about the Declination Axis Tighten Cradle Lock Knobs The telescope is now balanced Cradle 25 Ta Cradle Lock ef Fig 3 UNDERSTANDING THE EQUATORIAL MOUNT The Equatorial Mount 20 is designed to move in any direction It can be set to all
9. ow N N manual controls to track the movements of celestial bodies across the sky This is t EARTH S AXIS referred to as diurnal movement movement of celestial bodies in the direction ZS Set up the telescope at night Loosen the Declination Lock Knob 18 and rotate er e the telescope around the declination axis until the arrow on the declination scale points to 90 degrees Tighten the Declination Lock Knob The telescope is Fig 1 now roughly in parallel with the polar axis SE TEE Loosen the Horizontal Axis Lock Knob 13 and turn the telescope until the objective end faces due north This can be done by approximating the location of the pole star Polaris or North Star or by the use of a compass True North is then found by directing the telescope at Polaris as magnetic North is slightly away from true North Look up the latitude of your area in any geographical atlas Loosen the Latitude Lock Knob 22 and set the latitude scale to the correct latitude for your area Aim the Finderscope 1 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 13 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 wil
10. s 900 mm 20mm 45x or 45 power 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 135x or 135 power 45 x 3 135x or 135 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 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 15 and establish a well defined target see focusing telescope section Tighten all lock knobs Declination Latitude Right Ascension Horizontal Axis and Cradle so that telescope s aim is not disturbed Looking through Finderscope 1 alternate tightening each Finderscope Adjustment Screw 17 until crosshairs of Finderscope are precisely centered on the same object already centered in Main Telescope Tube s 15 field of view Now objects located first with the Finderscope 1 will be centered in the field of view of the main telescope Balancing the Telescope 1 opposite to that of the earth s rotation and is ar
11. s 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 www bushnell com ANSWERS TO COMMONLY ASKED QUESTIONS 1 The image I see in the telescope is upside down and e An upside down and reversed image is a common reversed from right to left characteristic of most astronomical telescopes Since telescopes are used for astronomical viewing orientation is not important The image in the finderscope will also be upside down and reversed 2 How do I determine the power my telescope e The power of your telescope can be determine by dividing the focal length of the objective lens by the focal length of the eyepiece The eyepiece focal length is the number printed on the eyepiece For example 1000 25 40X 3 Where do I find the Telescope Focal Length e The telescope focal length is the same focal length as the objective focal length For this telescope it is 900mm Telescope focal lengths range from 600mm to 900mm on Bausch amp Lomb Bushnell and Jason telescopes 4 What can I see with my telescope e Telescopes with power ranging from 25X to 50X can be used to view Star Clusters and Nebulae 90X to 120X telescope can view galaxies Most planets can be seen at 150X and higher 5 What do the numbers on the eyepiece mean The numbers on the eyepiece represents the focal Length of the eyepiece
12. ts This will allow you to see much fainter objects You d be surprised how much more you ll see from your local lake or park when compared to a backyard in the city Using your telescope out a window is NEVER recommended View objects that are high in the sky if possible Waiting until the object rises well above the horizon will provide a brighter and crisper image Objects on the horizon are viewed through several layers of earth s atmosphere Ever wonder why the moon appears orange as it sets on the horizon It s because you are looking through a considerable more amount of atmosphere than you would directly overhead Note If objects high in the sky are distorted or wavy you are probably viewing on a very humid night During nights of unstable atmosphere viewing through a telescope can be frustrating if not impossible Astronomers refer to crisp clear nights as nights of good seeing 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 The first thing you need to do is get 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 c
13. urrent 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 changes 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 star
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