Bushnell Model 78-9570 User's Manual
Contents
1. 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 J upiter 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 J upiter s four major moons Pay close attention to their positions from night to night They appear to be lined up on either side of J upiter 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 brilliant2. BUSHNELL gt 570 x 60 Rotary Compact Refractor Telescope Model 78 9570 SONOS WN Main Telescope Tube Objective Lens Main Tube locking Knobs 2 Vertical Adjustment Lock Aluminum Tripod Leg Tripod Leg Lock Screws 6 Tripod Leg Sections Tripod Leg Supports Horizontal Fine Adjustment Horzontal Adjustment Lock Knob Vertical Fine Adjusment Rack amp Pinion Focusing Mechanism T 18 Erecting Lens Receptor Rotary Power Turret Accessory Turret Finderscope Findarerane Aditictrmant Serewc STANDARD EQUIPMENT Refractor Telescope Assembly w R otary Power Turret Rotary Power Turret Includes 4mm 10mm and 20mm eyepieces 2 5x Barlow and Moon Filter Exclusive Metal Easy Track Mount Compact Three S ection Variable Height Aluminum Tripod Red Dot Finderscope T 18 1 5x Erecting Lens 4mm 10mm 20mm Eyepieces T 18 Slot eco Turret 2 5X Barlow MoonFilter Fig 1 TELESCOPE ASSEMBLY 1 Your Bushnell Voyager Telescope comes pre assembled from the factory for quick set up and use Remove all components from the carton and identify all components It is a good idea to lay all the parts out in front of you before assembly READ THROUGH SET UP INSTRUCTION BEFORE YOU SET UP YOUR TELESCOPE Set Up Tripod e Remove pre assembled tripod and mount from carton Loosen the leg section locking screws 2 per leg of o
3. VERSED this is acceptable for viewing celestial bodies Selecting an Eyepiece 1 Always begin viewing with the lowest power eyepiece which in this case is the 20mm lens Note the base power of each eyepiece is determined by the focal length of the telescope objective lens which for this model is 910 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 this 910mm 20mm 46x or 46 power 2 To select the 20mm eyepiece position the Rotary Power Turret 14 so that the 20mm eyepiece is in line with the Ocular Alignment Arrow 3 Included in the Accessory Turret 15 is a Barlow lens Barlow lenses are used to double or triple the power of your telescope Using the example above your 2 5x Barlow lens would give you a total power of 115x or 115 power 46 x 2 5 115x or 115 power 4 The full moon can be so bright that distinct surface details are difficult to view and prolonged viewing is uncomfortable Included in the Accessory Turret 15 is a Moon Filter Moon Filters are specially tinted lenses that reduce the glare of the moon so that enjoyable viewing can take place Focusing Telescope 1 After selecting the desired eyepiece aim main telescope tube at a land based target at least 200 yards away e g telephone pole or building Fully extend focusing tube by turning Rack and Pini
4. Venus appear as if you were looking ata 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 Much much more For further questions or additional information please contact Bushnell Sports Optics Worldwide 9200 Cody Overland Park KS 66214 www bushnell com ANSWERS TO COMMONLY ASKED QUESTIONS The image see in the telescope is upside down e An upside down and reversed image is a and reversed from right to left common characteristic of most astronomical telescopes Since telescopes are used for astronomical viewing orientation is not important However as described above the T 18 erecting lens can be used to provide normal images How do determine the power my telescope e The power of your telescope can be determined 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 2 40X Where do 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 910mm Telescope focal lengths range from 600mm to 910mm on Bushn
5. ell telescopes What can 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 telescopes can view galaxies Most planets can be seen at 150X and higher 5 Whatdo the numbers on the eyepiece mean e The numbers on the eyepiece represents the focal Length of the eyepiece 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 1 l ve completed the set up yet cannot see anything e Check to see if objective lens cover has been removed e Try to view an object that is 200 or more yards away e fthere is more than one eyepiece included with the telescope use the lowest power highest number eyepiece to begin viewing Use the Rack amp Pinion Focusing Mechanism 3 to bring the object you are trying to view into focus
6. 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 can 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 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 J upiter will race right out of the field of view To compensate just move the fine adjustment controls on your telescope to track it in the necessary path Helpful Hints 1 3 4 Your telescope is a very sensitive instrument For best results and fewer vibrations set your telescope up on a level location on the ground ra
7. ne leg and gently extend each section to the desired height Re tighten locking screws Repeat on remaining two legs Attach Telescope and Finderscope E e e Locate the pre assembled Telescope Main Tube 1 MARY My m Remove Main Tube Locking Nuts 3 from screws c extending from bottom of Telescope Main Tube 1 e Insert extended screws into holes in cradle of Easy i Track Mounting System Refasten Main Tube Locking 7 Nuts 3 l my e Remove plastic insert on bottom side of finderscope to KV ONS allow battery to make connection with battery contact for power Turn power switch on See finderscope An page 7 C E m ce ii e Look through main telescope tube at low power and T I establish a well defined stationary target Looking i NN AN through red dot finderscope alternate tightening each LL Io adjustment wheel at rear and left side of finderscope until the red dot of finderscope is precisely aligned and centered on the same object being viewed in main telescope tube See finderscope page Fig 2 Remove Lens Covers from 60mm Objective Lens and each ocular eyepiece contained in Rotary Power Turret 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 see appears UPSIDE DOWN and RE
8. o regain eyepiece functionality Transporting and Storing Telescope 1 Loosen tripod locking screws and collapse each tripod leg section Collapse Tripod Leg Brace 8 and pull all three tripod legs together Loosen Vertical Adjustment Lock 4 and tilt objective end of telescope toward tripod legs Slip telescope into carrying case and pull drawstring to close Please find below an image depicting how to attach the red dot finderscope and an image depicting a fully attached unit How To Attach Place Finderscope Cylindrical Groove over Cylindrical Finderscope Mount Post until it clicks into place Aligning and Using Red Dot Finderscope Remove plastic insert on bottom side of finderscope to allow battery to make connection with battery contact for power Turn power switch on Look through main telescope tube at low power and establish a well defined stationary target Looking through red dot finderscope alternate tightening each adjustment wheel at rear and left side of finderscope until the red dot of finderscope is precisely aligned and centered on the same object being viewed in main telescope tube Never Look Directly At The Sun With Your Telescope Permanent Damage To Your Eyes May Occur Enjoying Your New Telescope de First determine your targeted object Any bright object in the night sky is a good starting point The moon is favorite starting points in astronomy is the moon This is an object sure to please any budding ast
9. on Focusing Mechanism 12 2 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 Remove plastic insert on bottom side of finderscope to allow battery to make connection with battery contact for power Turn power switch on See finderscope page Look through main telescope tube at low power and establish a well defined stationary target Looking through red dot finderscope alternate tightening each adjustment wheel at rear and left side of finderscope until the red dot of finderscope is precisely aligned and centered on the same object being viewed in main telescope tube See finderscope page Now objects located first with the Finderscope 16 will be centered in the main telescope Viewing Land Based Objects 1 The T 18 Erecting Lens will correct the normally upside down and reversed image so that you can easily enjoy observing land based objects through your compact telescope 2 Simply insert the T 18 Erecting Lens into the T 18 Erecting Lens Receptor 13 3 Repeat focusing directions as described above except that you will be looking through the T 18 Erecting Lens instead of the 20mm eyepiece Note When the T 18 Erecting Lens is inserted into the T 18 Erecting Lens Receptor 13 the Eyepieces contained in the Rotary Power Turret 14 will_be inoperable Remove the T 18 Erecting Lens t
10. ronomer or experienced veteran When you have developed proficiency at this level other objects become good targets Saturn Mars J upiter and Venus are good second steps to take The first thing you need to do after assembling the telescope as planned is center the desired object in the finderscope s cross hairs Provided you did a reasonable job aligning the finderscope a quick look through the main telescope tube at low power should reveal the same image With the lowest power eyepiece the one with the largest number printed on it you should be able to focus the same image that you saw through the finderscope 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 in both scopes you ve passed the first obstacle If you don t see an image after attempting to focus it in you might consider aligning your finderscope again Once you pass this step you will enjoy the time spent ensuring a good alignment Every object you center in the finderscope will be easily found in the main telescope tube which is important for continuing your exploration of the night sky 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
11. ther 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 lights 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 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
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