Orion 90 Telescope User Manual
Contents
1. Filter for ShortTube 90 7730 Required for safe viewing of the Sun ENN N N NWN N Be eas Z ren EES S e E E E E o ES S S E E E EIT PRETO ESOS SRL Tees s ee nA ee ee me AN E AAT Gh E E A ai E E lity E A viata toscana EA ET ah R ein T iii EANA E Ea aF ey tet f ar sie Me gt bd 3 i ANN Sty in f i xy OK OK XO f SU CATA AMT GA i le ze gt aes Pao ee eee eee Se aS Say Sea EA EAA RIS T R T AEE T A Ye eC e e a a Se a a fi One Year Limited Warranty The Orion ShortTube 90mm Refractor is warrant ed against defects in materials or workmanship for a period of one year from the date of purchase This warranty is for the benefit of the original retail pur chaser only During this warranty period Orion Telescopes amp Binoculars will repair or replace at Orion s option any warranted instrument that proves to be defective provided it is returned postage paid to Orion Warranty Repair 89 Hangar Way Watsonville CA 95076 Proof of purchase such as a copy of the original receipt is required feat T N This warranty does not apply if in Orion s judgment the instrument has been abused mishandled or mod ified nor does it apply to normal wear and tear This warranty gives you specific legal rights and you may also have other rights which vary from state to state For further warranty service information contact Customer Service Department Orion Telescopes amp Binoculars P2. is a fundamental law of optics The steadiness of the air the seeing will limit how much magnification an image can tolerate Always start viewing with your lowest power longest focal length eyepiece in the telescope After you have located and looked at the object with it you can try switching to a higher power eyepiece to fer ret out more detail if atmospheric conditions permit If the image you see is not crisp and steady reduce the magnification by switching to a longer focal length eyepiece As a general rule a small but well resolved image will show more detail and provide a more enjoyable view than a dim and fuzzy overmagnified image Photography with the ShortTube 90 With the proper adapters the ShortTube 90 becomes a 500mm f 5 6 telephoto lens for a 35mm single lens reflex SLR camera You can take impressive pictures in daylight with the telescope camera com bination mounted on a sturdy camera tripod For astrophotography the telescope with camera attached should be mounted on an equa torial mount equipped with at least one motor drive to track the motion of the stars You will need both a T ring for your camera and a 1 25 Universal Camera Adapter to couple your camera to the back end of the tele scope Remove the nosepiece from the camera adapter the body of the adapter will not be needed here Connect the T ring to your cam era body remove any camera lenses first and connect the nosepiece of the camera
3. objects except in few of the brightest ones But as you become more experienced and your observing skills improve you will be able to coax out more and more intricate details Do You Wear Eyeglasses If you wear eyeglasses you may be able to keep them on while you observe if your eyepieces have enough eye relief to allow you to see the whole field of view You can find out by looking through the eyepiece first with your glasses on and then with them off and see if the glasses restrict the view to only a portion of the full field If they do you can easily observe with your glasses off by just refocusing the telescope the needed amount Calculating Magnification Power It is desirable to have a range of eyepieces of different focal lengths to allow viewing over a range of magnifications To calculate the mag nification or power of a telescope simply divide the focal length of the telescope by the focal length of the eyepiece Magnification Telescope Focal Length mm Eyepiece Focal Length mm For example the ShortTube 90 which has a focal length of 500mm used in combination with a 26mm eyepiece yields a power of 500 26 19x Every telescope has a useful limit of power of about 45x 60x per inch of aperture Claims of higher power by some telescope manufacturers are a misleading advertising gimmick and should be dismissed Keep in mind that at higher powers an image will always be dimmer and less sharp this
4. INSTRUCTION MANUAL Orion ShortTube 90 90mm Rich Field Refracting Telescope 9069 Welcome to a new world of adventure Your Orion ShortTube 90 is a fine quality instrument designed for both daytime ter restrial viewing and nighttime stargazing Compact portable and easy to use this versatile scope will provide many hours of enjoyment for the whole family These instructions will help you set up and properly use and care for your telescope Please read them over thoroughly before getting started Finder scope alignment screws poe scope Finder scope bracket lt 2 Focus lock setscrew Dew glare shield lt 1 4 20 mounting block The ShortTube 90mm Refractor Parts List Qty Description Optical tube assembly 26mm 19x Plossl eyepiece 1 25 WARNING Never look at the sun with your telescope or even with just your eyes without a professionally made solar filter Permanent eye damage or blindness could result Young children should use this telescope only with adult supervision Avoid using the type of solar filter that screws into an eye piece They are susceptible to cracking under the intense heat that builds up near the focus point and could cause severe retinal damage Use only the type of solar filter that Getting Started covers the front of the telescope Be sure also to cover the front of the finder scope with aluminum foil or another The ShortTube 90 comes nearly fully assembled from t
5. O Box 1815 Santa Cruz CA 95061 800 676 1343 rsh Me eG EG REG Ce Le Gn S T i iS a Ae SO es Ae aS 6 iy ES A a i a es ee i mt y i OS GES GONG GS EEG ES GEG G8 Poe oe ae con eee cot PESSET Se oF See NS P i MN t ARNAN PANNAN 44 Cy lt 2 o7 9 d d e di d t d t AN y EF a i eee Aree Ar Are Ar nn A rns ean gti 7 A a E A aration A a eas petra See Se SSE NSS SS Se NE Sere SSS SS Se Orion Telescopes amp Binoculars Post Office Box 1815 Santa Cruz CA 95061 Customer Support Help Line 800 676 1343 Day or Evening
6. Terrestrial Viewing For terrestrial observing you may wish to replace the standard equipment 90 star diagonal with an optional 45 correct image diagonal Orion part 8790 The 90 star diagonal is preferred for astronomical use but gives an image that is reversed left to right which doesn t really matter when viewing celestial objects For day time terrestrial use however you will want a properly oriented image so use of the 45 correct image diagonal is recommended For terrestrial applications we recommend mounting the ShortTube 90 on an altazimuth style camera tripod such as the Orion Paragon HD F2 or telescope mount Orion AZ 3 mount which allow simple vertical altitude and horizontal azimuth motions For most astro nomical telescope mounts you will need a 1 4 20 adapter to couple the scope to the mount head Camera tripods come already equipped with a 1 4 20 post so no adapter is needed With the eyepiece inserted and secured in the diagonal simply point the telescope at the subject you want to observe and center it on crosshairs of the finder scope which you ve previously aligned with the telescope as explained in the preceding section Then look into the eyepiece of the main telescope and the subject should be in the center of the field of view If the view is blurry adjust the focus with the focus wheel until the image appears sharp For higher magnification additional eyepieces of shorter focal leng
7. adapter to the T ring Now insert the entire assembly into the focuser s drawtube remove the eyepiece and diag onal and secure with the setscrew on the drawtube Be sure to tighten the setscrew or your camera could fall to the ground Use the camera s viewfinder to frame the picture Use the telescope s focuser to focus the image Tighten the focus lock setscrew to make sure the camera does not slip out of focus You may want to consider using a remote shutter release instead of the shutter release on the camera Touching the camera can vibrate the system and blur the resulting photographic image Also be sure to use a Solid tripod Care amp Maintenance Give your telescope reasonable care and it will last a lifetime Store it indoors or in a dry garage Do not leave the telescope outside except when using it The optical tube is aluminum and has a smooth paint ed surface that should resist scratches and smudges If a scratch does appear on the tube it will not harm the telescope If you wish you can apply some white auto touch up paint to the scratch Smudges on the tube can be wiped off with standard household cleaners such as Windex or Formula 409 Any quality optical lens tissue and cleaning fluid specifically designed for multi coated optics can be used to clean the telescope s objective lens as well as the lenses of the eyepieces and finder scope Never use regular glass cleaner or cleaning fluid designed for eyeglas
8. he factory The opaque material to prevent physical damage to the internal telescope s optics have been installed and collimated so you should components of the scope itself as well as to your eyes not have to make any adjustments to them Open the box and inspect the contents to make sure all of the parts listed above are present ai ORIONI Customer Support 800 676 1343 E mail support telescope com TELESCOPES amp BINOCULARS Corporate Offices 831 763 7000 Providing Exceptional Consumer Optical Products Since 1975 P O Box 1815 Santa Cruz CA 95061 90 star diagonal 6x30 finder scope Objective lens cap Se eee eee eS IN 114 Rev C 0899 Please keep the original shipping box In the unlikely event you should need to ship the telescope back to Orion for warranty repair service you should use the original packaging The box also makes a very good container for storing the telescope when it is not in use Installing the Accessories Slide the 6x30 finder scope into its mounting bracket preinstalled on the optical tube and gently tighten the six alignment screws Insert the 90 star diagonal into the focuser drawtube and secure with the knurled setscrew Slide the eyepiece into the diagonal and tighten the setscrew on the diagonal Mounting the Telescope on a Tripod The ShortTube 90 can be mounted on any standard camera tripod that has a 1 4 20 stud The stud threads into the small block on the under side of the tele
9. nt to exactly the same spot Alignment is easiest to do in daylight rather than at night under the stars First insert the eyepiece into the main telescope s focuser Then point the telescope at a discrete object such as the top of a telephone pole or a street sign that is at least a quarter mile away Move the tele scope so the target object appears in the very center of the field of view when you look into the eyepiece Now look through the finder scope Is the object centered in the find er scope s field of view i e on the crosshairs If not hopefully it will be visible somewhere in the field of view so only fine adjustment of the six alignment screws will be needed Otherwise you ll have to make coarser adjustments to the alignment screws to redirect the aim of the finder scope Make sure to loosen the knurled lock nut on each alignment screw before adjusting it Use the six alignment screws to center the object on the crosshairs of the finder scope Then look again into the main telescope s eye piece and see if it is still centered there as well If it isn t repeat the entire process making sure not to move the main telescope while adjusting the alignment of the finder scope Finder scopes can come out of alignment during transport of the tel escope so check the alignment before each observing session Note that the image seen through the finder scope appears upside down This is normal for astronomical finder scopes
10. od 5370 Portable yet sturdy camera tri pod e AZ 3 Altazimuth Mount 9018 Telescope mount with dual slow motion controls e 1 4 20 Adapter for AZ 3 Mount 10100 Couples telescope to mount e SkyView Deluxe Equatorial Mount 9400 Excellent mount for astronomical use e 1 4 20 Adapter for SkyView Deluxe Mount 3800 Needed to use SVD Mount e AccuTrack SVD DC Motor Drive 7825 Provides hands free tracking for the SVD Mount e 45 Correct Image Diagonal 8790 Gives a correctly oriented image recommended for terrestrial use e RedBeam LED Flashlight 5744 Preserves dark adapted night vision e DeepMap 600 4150 Great pocket reference featuring the 600 best celestial objects to view OG CNA A i Moon Filter 5662 Reduces lunar glare bringing out more sur face detail T ring Camera model specific Required for through the tele scope photography Call for assistance Universal Camera Adapter 1 25 5264 Required for through the telescope photography Soft Case for ShortTube 90 15166 Protects the telescope for transporting Sirius Pl ssl 1 25 Eyepieces Recommended eyepieces for addi tional magnifications Shorty 2x Barlow 1 25 8711 Doubles the magnification of any eyepiece 6 Piece Optics Cleaning Kit 5825 Everything you need to keep optics sparkling Starter Set of Four 1 25 Color Filters 5514 Helps bring out subtle detail in planets Solar
11. ou will have to refer to charts published monthly on our website www telescope com or in Astronomy Sky amp Telescope or other astronomy references to locate them Venus Mars Jupiter and Saturn are the brightest objects in the sky after the Sun and the Moon All four of these planets are not normally visible in the sky at one time but chances are one or two of them will be JUPITER The largest planet Jupiter is a great subject to observe You can see the disk of the giant planet and watch the ever changing positions of its four largest moons lo Callisto Europa and Ganymede If atmospheric conditions are good you may be able to resolve thin cloud bands on the planet s disk SATURN The ringed planet is a breathtaking sight when it is well positioned The tilt angle of the rings varies over a period of many years sometimes they are seen edge on while at other times they are broadside and look like giant ears on each side of Saturn s disk A steady atmosphere good seeing is necessary for a good view You may probably see a tiny bright star close by that s Saturn s bright est moon Titan VENUS At its brightest Venus is the most luminous object in the sky excluding the Sun and the Moon It is so bright that sometimes it is visible to the naked eye during full daylight Ironically Venus appears as a thin crescent not a full disk when at its peak brightness Because it is so close to the Sun it never wanders
12. scope s optical tube Alternatively the telescope can be attached to an equatorial mount equipped with a 1 4 20 adapter An equatorial mount is desirable for astronomical viewing because it allows easy manual tracking of celestial objects as the Earth rotates Also the setting circles on the mount enable you to locate objects by their celestial coordinates right ascension and declination which can be found in many observing books and star atlases Focusing The ShortTube 90 is equipped with a precision rack and pinion focuser When you first look in the eyepiece the image you see may be fuzzy or out of focus If so gently turn one of the large focusing wheels with your fingers until the image becomes sharp Be sure to first loosen the knurled focus lock setscrew on the top of the focuser You will have to readjust the focus when aiming at subjects of vary ing distances or after changing eyepieces Aligning the Finder Scope The ShortTube 90 comes with a 6x30 achromatic finder scope The 6 means six times magnification and the 30 indicates a 30mm diame ter front lens The finder scope makes it easier to locate the subject you want to observe in the telescope because the finder scope has a much wider field of view Images viewed in the finder scope will appear upside down which is normal for astronomical finder scopes Before you can properly use the finder scope it must be precisely aligned with the telescope so they both poi
13. ses Before cleaning with fluid and tissue however blow any loose parti cles off the lens with a blower bulb or compressed air or lightly brush the lens with a soft camel hair brush Apply some cleaning fluid to a tissue never directly on the optics Wipe the lens gently in a circular motion then remove any excess fluid with a fresh lens tissue Oily fin gerprints and smudges may be removed using this method Use caution rubbing too hard may scratch the lens On larger lenses clean only a small area at a time using a fresh lens tissue on each area Never reuse tissues Do not disassemble the telescope eyepieces or other optical components included with the telescope for any reason or your warranty will be void Cleaning of inaccessible optical surfaces should be performed by experienced opticians Call Orion for information Specifications Objective lens 90mm aperture achromatic air spaced doublet fully antireflection coated Focal length 500mm Focal ratio f 5 6 Weight of optical tube assembly 5 Ibs Mounting provision 1 4 20 threaded mounting block Finder scope 6x magnification 30mm aperture achromatic crosshairs Eyepiece 26mm 19x Pl ssl 1 25 barrel diameter fully coated Diagonal 90 star diagonal mirror type 1 25 barrel diameter Suggested Accessories Full descriptions of the following accessories are available in the Orion print catalog or online catalog www telescope com e Paragon HD F2 Trip
14. th can be purchased But remember increasing the magnification decreases the field of view and the image brightness Astronomical Viewing The ShortTube 90 excels for astronomical observation Its unob structed 90mm aperture and short 500mm focal length f 5 6 provide bright expansive views of star fields and celestial objects residing within our solar system and beyond For casual stargazing an altazimuth mount such as the Orion AZ 3 mount will do the job just fine But an equatorial mount such as the Orion SkyView Deluxe EQ mount is designed to make it easier to man ually track the motion of celestial objects with just one slow motion cable Furthermore with an equatorial mount you can add an optional motor drive to track the stars automatically a great convenience When selecting a location for nighttime stargazing make it as far away from city lights as possible Light polluted skies greatly reduce what can be seen with the telescope Also give your eyes at least 20 minutes to dark adapt to the night sky You ll be surprised at how many more stars you will see Use a red flashlight such as the Orion RedBeam LED Flashlight to see what you re doing at the telescope or to read star charts Red light will not spoil your dark adapted night vision as readily as white light will To find celestial objects with your telescope you first need to become reasonably familiar with the night sky Unless you know how to rec ogni
15. too far from the morning or evening horizon No surface markings can be seen on Venus which is always shrouded in dense clouds MARS If atmospheric conditions are good you may be able to see some subtle surface detail on the Red Planet possibly even the polar ice cap Mars makes a close approach to Earth every two years during those approaches its disk is larger and thus more favorable for viewing C Stars Stars will appear like twinkling points of light in the telescope Even the largest telescopes cannot magnify stars to appear as anything more than points of light You can however enjoy the different colors of the stars and locate many pretty double and multiple stars The famous Double Double in the constellation Lyra and the gorgeous two color double star Albireo in Cygnus are favorites Defocusing the image of a star slightly can help bring out its color D Deep Sky Objects Under dark skies you can observe a number of brighter deep sky objects with your ShortTube 90 including gaseous nebulas open and globular star clusters and the brighter galaxies Most deep sky objects are very faint so it is important that you find an observing site well away from light pollution Take plenty of time to let your eyes adjust to the darkness Don t expect these objects to appear like the photographs you see in books and magazines most will look like dim gray ghosts Our eyes are not sensitive enough to see color in deep sky
16. ze the constellation Orion for instance you won t have much luck locating the Orion Nebula A simple planisphere or star wheel can be a valuable tool for learning the constellations and seeing which ones are visible in the sky on a given night A good star chart or atlas like the Orion DeepMap 600 can come in handy for helping locate interesting objects among the dizzying multi tude of stars overhead Except for the Moon and the brighter planets it is pretty time consuming and frustrating to hunt for objects randomly without knowing where to look It is best to have specific targets in mind before you begin looking through the eyepiece A The Moon The Moon with its rocky cratered surface is one of the easiest and most interesting subjects to observe with your telescope The myriad craters rilles and jagged mountain formations offer endless fascina tion The best time to observe the Moon is during a partial phase that is when the Moon is not full During partial phases shadows cast by crater walls and mountain peaks along the border between the dark and light portions of the lunar disk highlight the surface relief A full Moon is too bright and devoid of surface shadows to yield a pleasing view Try using a Moon filter to dim the Moon when it is too bright it simply threads onto the bottom of the eyepiece B The Planets The planets don t stay put like stars do planets don t have fixed R A and Dec coordinates so y
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