INSTRUCTION MANUAL
Contents
1. bservational References A Field Guide to the Stars and Planets by Jay M Pasachoff Houghton Mifflin Company 1999 Atlas of the Moon by Antonin R kl Kalmbach Publishing Co Books Division Waukesha WI 1993 Burnham s Celestial Handbook An Observer s Guide to the Universe Beyond the Solar System by Robert Burnham Dover Publications New York 3 volume set 1978 Observer s Handbook by The Royal Astronomical Society of Canada University of Toronto Press Toronto ON Canada published annually Sky Atlas 2000 0 by Wil Tirion and Roger W Sinnott Sky Publishing Corp Cambridge MA 2nd edition 1998 Marrana Astronomy Magazine Kalmbach Publishing Co Waukesha WI Sky amp Telescope Magazine Sky Publishing Corp Cambridge MA SkyNews Magazine The Canadian Magazine of Astronomy amp Stargazing SkyNews Inc Yarker ON Canada TECHNICAL SUPPORT Canada Tel 604 270 2813 between 9 00AM and 3 00PM PST Fax 604 270 2330 Outside Canada Please contact your dealer for technical support Web site www SkywatcherTelescope com Technical Support e mail support skywatchertelescope com 162. 2 Insert tripod lock screws into the thread holes on the side of the tripod clamp without over tightening ATTACHING MOUNT TO TRIPOD LEGS Fig 2 3 Fasten the top of each tripod leg to the bottom of the yoke mount using the machine screws with the washers and wingnuts Align each leg so that the hinge for the accessory tray faces inwards Be careful not to over tighten the wingnuts and damage tripod legs ATTACHING THE ACCESSORY TRAY Fig 3 Fig 3 1 Locate tripod leg brace 2 Use the screws already attached to the tripod hinges to mount the tray platform 3 Secure the accessory tray on top of the tray platform using the thumbscrews already attached With multi function plate ATTACHING THE TUBE ATTACHING THE TUBE RINGS TO MOUNT Fig 4 RINGS TO MOUNT Fig 4 1 Remove the tube rings multifunction plate assembly from telescope by releasing their thumbnuts and opening their hinges 2 Using one of the three threaded holes in the multif function pate ring plate assembly to the mounting plateform Turn the knurled black wheel directly underneath the mounting platform on the alt az mount while holding the tube rings in place to secure ATTACHING THE TELESCOPE the telescope in place MAIN TUBE TO TUBE RINGS Fig 5 1 Remove the tube rings from telescope by releasing their thumb nuts and opening their hinges 2 Fasten the tube rings to the mount using the wench provided ATTACHING THE TELESCOPE 1 Find the ce
3. Tube When you connect a camera directly to your telescope for prime focus photography you sometimes require an adapter so that the camera can be focussed Some reflectors need more length than the focuser can travel in order to focus the camera and some refractors are designed to be used with diagonals so when used with only a camera their focal length has to be extended This is particularly true when photographing near objects Your camera with its telescope lens may focus on a distant object such as a star but will require the 2 5 camera adapter tube to focus on a near object such as a bird The camera adapter tube is easily installed by GD screwing it onto the T threads of the eyepiece end of the camera adapter tube This makes the j telescope into a lens which you then attach to holder then screwing the specific T adapter ring your camera as you would any other lens Eyepiece Camera Adapter T adapter for your camera onto the T threads on the other Holder Tube Camera Pointing your telescope Pointing an altitude azimuth alt az mounted telescope is relatively easy With the mount level you can swivel the telescope around on a plane parallel to your horizon and then tilt it up and down from there Fig c You can think of it as turning your telescope in azimuth until it is facing the horizon below a celestial object and then tilting it up to the object s altitude However the Earth rotates and therefore the stars a
4. mirror Mirror cell Aligning the Secondary Mirror Locking screw Adjusting screw Point the telescope at a lit wall and insert the collimating cap into the focuser in place of a regular eyepiece Look into the focuser through your collimating cap You may have to twist the focus knob a few turns until the reflected image of the focuser is out of your view Note keep your eye against the back of the focus tube if collimating without a collimating cap Ignore the reflected image of the collimating cap or your eye for now instead look for the three clips holding the primary mirror in place If you can t see them Fig m it means that you will have to adjust the three bolts on the top of the secondary mirror holder with possibly an Allen wrench or Phillip s screwdriver You will have to alternately or loosen one and then compensate for the slack by tightening the other two Stop when you see all three mirror clips Fig n Make sure that all three small alignment screws are tightened to secure the secondary mirror in place Primary mirror clip Primary mirror clip Ignore the reflected image for now Y Primary mirror clip 14 Primary mirror clip Aligning the Primary Mirror Find the three locking screws at the back of your telescope and loosen them by a few turns Adjusting screw Locking screw Locking screw Adjusting screw If you see 3 large nuts protruding E If you see 6 Phillip s head screws from the back of your telescope S
5. mount This telescope has an altitude up down azimuth left right mount to control telescope movements Loosen the azimuth lock knob to make left right direction movements then tighten to lock Loosen the altitude lock knob to make course up down changes Altitude fine adjustments can be made by rotating the knurled wheel on the altitude fine adjustment rod after tightening the altitude lock knob Fig e Operating the AZ2 mount Same as the AZ1 mount above Fig f Altitude fine adjustment Azimuth adjustment OPERATING YOUR TELESCOPE Operating the AZ3 mount C ioo Azimuth locking knob This mount has controls for movement in altitude up down and azimuth left right Coarse azimuth movement is controlled by a locking knob located near the tripod head for left right rotation Loosen e the knob to make large direction changes then lock it for fine adjustments Coarse Altitude movement is controlled by a friction bolt Use the micro adjustment control cables to make small altitude and azimuth movements such as centreing objects in view The microadjustment controls have limited travel so it is best to contre them on their threads before making a coarse Azimuth fine adjustment adjustment Fig e Altitude fine adjustment Using the Barlow lens QD Eyepiece Barlow A Barlow is a negative lens which increases the magnifying power Sech of an eyepiece while reducing the field of view It expands the cone of
6. the focussed light before it reaches the focal point so that the telescope s focal length appears longer to the eyepiece The Barlow is inserted between the focuser and the eyepiece in a reflector and usually between the diagonal and the eyepiece in a refractor or a catadioptric Fig f With some telescopes it can also be inserted between the focuser and the diagonal and in this position it gives even greater magnification For example a Barlow which is 2X when inserted after the diagonal can become 3X when placed in front of the diagonal In addition to increasing magnification the benefits of using a Barlow lens include improved eye relief and reduced spherical aberration in the eyepiece For this reason a Barlow plus a lens often outperform a single lens producing the same magnification However its greatest value may be that a Barlow can potentially double the number of eyepiece in your collection Focusing n S Slowly turn the focus knobs under the focuser ele one way or the other until the image in the AM OQ eyepiece is sharp Fig g The image usually Ci 7 has to be finely refocused over time due to NS small variations caused by temperature changes flexures etc This often happens with short focal ratio telescopes particularly when they haven t yet reached outside temperature Refocusing A is almost always necessary when you change an eyepiece or add or remove a Barlow lens 10 Using the Camera Adapter
7. INSTRUCTION MANUAL FOR ALI AZMUTH MOUNT e AM Qis KR T A ISK 2 RZ w Si Z BN ES AN Z EFU A Kal HS A N U TA SN ci S I 9 HS AZ1 amp AZ MOUNTS Refractor AZ2 Dust Cap Mask Remove before Viewing Dew Cap Sun Shade Objective Lens Telescope Main Tube Finderscope Finderscope Bracket Alignment Screws Focus Locking Screw Eyepiece Diagonal Focus Tube Focus Knob CAC rOmmoom E Altitude fine adjustment control Azimuth Lock Yoke Mount Altitude Lock Knob Yoke Locking Knob Accessory Tray Tripod Leg Height Adjustment Clamp Secondary Mirror Position Dust Cap Mask Remove before Viewing Focus Tube Finderscope Bracket Finderscope Finderscope Adjustment Screws Eyepiece Focus Knob Telescope Main Tube Primary Mirror Position Yoke Locking Knob Altitude Lock Knob Azimuth Lock Knob Yoke 5 Altitude Fine Adjustment Control a Accessory Tray b Tripod Leg c Height Adjustment Clamp AZ MOUNTS g A D F A Dust Cap Mask G Remove before Viewing E B Dew Cap Sun Shade H C Objective Lens D Piggyback Bracket g d E Telescope Main Body a JN cht F Finderscope L A G Finderscope Bracket Ce H AD H Alignment Screws L Focus Tube S N NN SYA J j Eyepiece Sud K Diagonal fe L Focus Knob DS KEG V RNN RR 1 Azimuth Flexible Control Et NNNJ Ca
8. S but 3 protruding from the back of and 3 small Phillip s head screws NS your telescope the 3 protruding besides them the Phillip s head 3 screws are locking screws and the screws are the locking screws and ones next to them are adjusting the large nuts are the adjusting screws 9 Screws hex bolt Locking screw Adjusting screw If you see 3 hex bolts and 3 Phillip s head screws the hex bolts are the locking screws and the Phillip s head screws are the adjusting screws You will need an Allen wrench to adjust the locking screws m Now run your hand around the front of your telescope keeping your eye to the focuser you will see the reflected image of Secondary your hand The idea here being to see which way the primary UH mirror is defected you do this by stopping at the point where the reflected image of the secondary mirror is closest to the primary mirrors edge Fig o When you get to that point stop and keep your hand there while looking at the back end of your telescope is there a adjusting screw there If there is you will want to loosen it turn the screw to the left to bring the mirror away from that Primary mirror dig ue Feet point If there isn t a adjusting screw there then go across SE to the other side and tighten the adjusting screw on the other side This will gradually bring the mirror into line until it looks like Fig p It helps to have a friend to help for primary mirror GE collimation Have
9. a central of light the Airy disc surrounded by a number of diffraction rings If the rings are symmetrical about the Airy Corretly aligned Needs collimation disc the telescope s optics are correctly collimated Fig j If you do not have a collimating tool we suggest that you make a collimating cap out of a plastic 35mm film canister black with gray lid Drill or punch a small pinhole in the exact center of the lid and cut off the bottom of the canister This device will keep your eye centered of the focuser tube Insert the collimating cap into the focuser in place of a regular eyepiece eo L Focuser Collimation is a painless process and works like this Support for Pull off the lens cap which covers the front of the telescope secondary mirror and look down the optical tube At the bottom you will see the primary mirror held in place by three clips 120 apart and at the top the small oval secondary mirror held in a support and tilted 45 toward the focuser outside the tube wall Fig k Primary mirror Secondary mirror The secondary mirror is aligned by adjusting the central bolt e behind it which moves the mirror up and down the tube and the three smaller screws surrounding the bolt which adjust the angle of the mirror The primary mirror is adjusted by the three adjusting screws at the back of your scope The three locking screws beside them serve to hold the mirror in place after collimation Fig l Primary
10. agonal in place 3 Loosen the thumbscrews on the diagonal 4 Insert the desired eyepiece into the diagonal and secure by re tightening the thumbscrews OPERATING YOUR TELESCOPE ligning the finderscope qu These fixed magnification scopes mounted on the optical tube are very 5 useful accessories When they are correctly aligned with the telescope objects can be quickly located and brought to the centre of the field Alignment is best done outdoors in day light when it s easier to locate objects If it is necessary to refocus your finderscope sight on an object that is at least 500 yards metres away For 5x24 finderscope twist the end of the finderscope until focus is reached Fig a For 6x30 finderscope loosen the locking ring by unscrewing it back towards the bracket The front lens holder can now be turned in and out to focus When focus is reached lock it in position with the locking ring Fig b 1 Choose a distant object that is at least 500 yards away and point the main telescope at the object Adjust the telescope so that the object is in the centre of the view in your eyepiece 2 Check the finderscope to see if the object centred in the main tele Scope view is centred on the crosshairs 3 For the 5x24 finderscope use the three alignment screws to centre the finderscope crosshairs on the object Fig c For the 6x30 finder scope with spring loading adjust only the two small screws Fig d Operating the AZ1
11. ause the telescope to vibrate Pavement and concrete can also radiate stored heat which will affect observing Observing through a window is not recommended because the window glass will distort images considerably And an open window can be even worse because warmer indoor air will escape out the window causing turbulence which also affects images Astronomy is an outdoor activity Choosing the best time to observe The best conditions will have still air and obviously a clear view of the sky It is not necessary that the sky be cloud free Often broken cloud conditions provide excellent seeing Do not view immediately after sunset After the sun goes down the Earth is still cooling causing air turbulence As the night goes on not only will seeing improve but air pollution and ground lights will often diminish Some of the best observing time is often in the early morning hours Objects are best observed as they cross the meridian which is an imaginary line that runs through the Zenith due North South This is the point at which objects reach their highest points in the sky Observing at this time reduces bad atmospheric effects When observing near the horizon you look through lots of atmosphere complete with turbulence dust particles and increased light pollution Cooling the telescope Telescopes require at least 10 to 30 minutes to cool down to outside air temperature However this may take longer if there is a big diference betwee
12. ble e 2 Altitude Flexible Control d E L SE exible Contro d 3 Yoke Mount a Accessory Tray b Tripod Leg c Height Adjustment Clamp SG Optional Multi function Plate TABLE OF CONTENTS Assembling Your Telescope For AZ1 amp AZ2 ripod Set up eem eme a eb S Telescope Assembly Finderscope Assembiy Eyepiece Assembly For AZ3 Tripod Set up 5 2 A 2 2c 2 SR 2 SELA D2 RE 2 SEA 22 RA 2 E A 2 RA nesses Telescope Assembly Finderscope Assembly Eyepiece Assembly Operating Your Telescope Aligning the Finderscope Operating the AZ1 Mount Operating the AZ2 Mount Operating the AZ3 Mount Using the Barlow Lens Focusing Using the Camera Adapter Tube Pointing Your Telescope Calculating the Magnification power Calculating the Field of View Calculating the Exit Pupil Observing the Sky Sky Conditions Selecting an Observing Site Choosing the Best Time to Observe Chooling the Telescope Using Your Eyes Proper Care for Your Telescope Collimating a Newtonian Cleaning Your Telescope Suggested Reading Before you begin This instruction manual is applicable to all the models listed on the cover Take a moment to find the model closest to your telescope on p 2 and p 3 Follow the instructions for your specific model in the manual Read the entire instructions carefully before be
13. ce Dickinson and Alan Dyer Firefly Books Ltd Willowdale ON Canada revised edition 1994 The Beginner s Observing Guide An Introduction to the Night Sky for the Novice Stargazer by Leo Enright The Royal Astronomical Society of Canada Toronto ON Canada 1999 The Deep Sky An Introduction by Philip S Harrington Sky Publishing Corporation Cambridge MA Sky amp Telescope Observer s Guides Series ed Leif J Robinson 1997 The Universe from Your Backyard A Guide to Deep Sky Objects by David J Eicher Kalmbach Publishing Co Books Division Waukesha WI 1988 Turn Left at Orion A Hundred Night Sky Objects to See in a Small Telescope and how to Find Them by Guy J Consolmagno and Dan M Davis Cambridge University Press New York 3rd edition 2000 Ac Trier A Manual Of Advanced Celestial Photography by Brad D Wallis and Robert W Provin Cambridge University Press New York 1984 Astrophotography An Introduction by H J P Arnold Sky Publishing Corp Cambridge MA Sky amp Telescope Observer s Guides Series ed Leif J Robinson 1995 Astrophotography for the Amateur by Michael Covington Cambridge University Press Cambridge UK 2nd edition 1999 Splendors of the Universe A Practical Guide to Photographing the Night Sky by Terence Dickinson and Jack Newton Firefly Books Willowdale ON Canada 1997 Wide Field Astrophotography by Robert Reeves Willmann Bell Inc Richmond VA 2000
14. ginning Your telesope should be assembled during daylight hours Choose a large open area to work to allow room for all parts to be unpackaged Caution Never use your telescope to look directly at the sun Permanent eye damage will result Use a proper solar filter for viewing the sun When observing the sun place a dust cap over your finderscope to protect it from exposure Never use an eyepiece type solar filter and never use your telescope to project sunlight onto another surface the internal heat build up will damage the telescope optical elements TRIPOD SET UP Fig 1 M ASSEMBLING TRIPOD LEGS Fig 1 d 1 Gently push middle section of each tripod leg at the top so that the SQ pointed foot protrudes below the tripod clamp d 2 Insert tripod lock screws into the thread holes on the side of the tripod and clamp without over tightening 3 Fasten the top of each tripod leg to the bottom of the yoke mount using the machine screws with the washers and wingnuts Align each leg so that the hinge for the accessory tray faces inwards Be careful not to over tighten the wingnuts and damage tripod legs ATTACHING THE ACCESSORY TRAY Fig 3 1 Attach accessory tray to hinges on tripod legs using the small machine screws and wing nuts Flange fits under accessory tray when attached Fig 4 AZ reflector AZ refractor ATTACHING TELESCOPE MAIN TUBE TO MOUNT Fig 4 5 6 7 1 Unscrew the machine screw on the altitude contr
15. ld and then increase the magnification when you have found what you are looking for First find the moon then look at the shadows in the craters Caiculating the exit pupil The Exit Pupil is the diameter in mm of the narrowest point of the cone of light leaving your telescope Knowing this value for a telescope eyepiece combination tells you whether your eye is receiving all of the light that your primary lens or mirror is providing The average person has a fully dilated pupil diameter of about 7mm This value varies a bit from person to person is less until your eyes become fully dark adapted and decreases as you get older To determine an exit pupil you divide the diameter of the primary of your telescope in mm by the magnification Diameter of Primary mirror in mm Exit Pupil Pe Magnification For example a 200mm f 5 telescope with a 40mm eyepiece produces a magnification of 25x and an exit pupil of 8mm This combination can probably be used by a young person but would not be of much value to a senior citizen The same telescope used with a 32mm eyepiece gives a magnification of about 31x and an exit pupil of 6 4mm which should be fine for most dark adapted eyes In contrast a 200mm f 10 telescope with the 40mm eyepiece gives a magnification of 50x and an exit pupil of 4mm which is fine for everyone 12 OBSERVINGTHESKY Sky conditions Sky conditions are usually defined by two atmospheric characteristics seeing or the steadines
16. n the temperature of the telescope and the outside air This minimizes heat wave distortion inside telescope tube tube currents Allow a longer cooling time for larger optics If you are using an equatorial mount use this time for polar alignment Using your eyes Do not expose your eye to anything except red light for 30 minutes prior to observing This allows your pupils to expand to their maximum diameter and biochemical light adaptation to occur It is important to observe with both eyes open This avoids fatigue at the eyepiece allows you to check against reference material and is a good habit to develop if you sketch at the eyepiece If you find this too distracting cover the non used eye with your hand or an eyepatch Use averted vision on faint objects The center of your eye is the least sensitive to low light levels When viewing a faint object don t look directly at it Instead look slightly to the side and the object will appear brighter 13 PROPER CARE FOR YOUR TELESCOPE Collimating a Newtonian Collimation is the process of aligning the mirrors of your telescope so that GD they work in concert with each other to deliver properly focused light to your eyepiece By observing out of focus star images you can test whether your telescope s optics are aligned Place a star in the centre of the field of view and move the focuser so that the image is slightly out of focus If the seeing i conditions are good you will see
17. nter of balance of Fig 5 MAIN TUBE TO TUBE the telescope tube Place this RINGS Fig 5 in between the two tube rings Close the hinges around the PR 1 Remove the telescope tube from telescope and fasten securely he paper coveanng by tightening the thumb nuts 2 Wes aha xa ber t SR Do not over tighten the thumb 1S vo IUBE TINgS S056 Me hinges around the telescope and nuts fasten securely by tightening the thumb nuts without over tightening TELESCOPE ASSEMBLY INSTALLING CONTROL CABLES Fig 6 1 Slide the sleeve end of the cable over the nipple on the end of the worm gear Secure the cable by tightening the set screw against the flat surface on the nipple eegen DM tegt FINDERSCOPE ASSEMBLY Small finderscope Large finderscope ATTACHING THE FINDER ATTACHING THE FINDERSCOPE SCOPE 7 BRACKET 7 1 Locate finderscope optical 1 Locate finderscope optical assembly assembly 2 Slide finderscope assembly into the rectancular 2 Remove the two knurled slot and tighten the thumbscrew to hold the bracket thumbscrews near the end in place of the telescope main body 3 Position the finderscope bracket over the screws in the telescope main body 4 Secure the finderscope bracket with the two knurled thumbscrews INSERTING DIAGONAL AND EYEPIECE Fig 8 1 Loosen the thumbscrew on the end of the focus tube 2 Insert a diagonal into the focus tube and re tighten the thumbscrew to hold the di
18. ol locking knob 2 Insert the micro adjustable altitude control into the hole on the side of the altitude control locking knob TELESCOPE ASSEMBLY continued from p 2 3 Slide telescope tube into slots on end of yoke mount Secure telescope tube onto yoke mount using the yoke locking knobs without overtightening 4 Remove machine screw from telescope tube and use this to fasten the micro adjustable altitude control ATTACHING THE FINDERSCOPE Fig 8 9 1 Locate finderscope optical assembly 2 Remove the two knurled thumbscrews near the end of the telescope main tube 3 Position the finderscope bracket over the screws in the telescope main body 4 Secure the finderscope bracket with the two knurled thumbscrews AZ refractor INSERTING EYEPIECE Fig 10 1 Unscrew the thumbscrews on the end of the focus INSERTING EYEPIECE tube to remove the plastic endcap Fig 10 2 Insert diagonal and re tighten thumbscrews to hold diagonal in place 1 Unscrew the thumbscrews 3 Loosen the thumbscrews on the diagonal on the end of the focus 4 Insert the desired eyepiece into diagonal tube to remove the black and secure by re tightening plastic end cap thumbscrews 2 Insert the desired eyepiece and re tighten thumb screws to hold eyepieces in place ASSEMBLING TRIPOD LEGS Fig 1 1 Gently push middle section of each tripod leg at the top so that the pointed foot protrudes below the tripod clamp
19. re constantly moving so to track with this mount you need to constantly nudge the optical tube in both azimuth and altitude to keep the object in the field In reference material for your local position the altitude will be listed as degrees minutes seconds above or below your horizon Azimuth may be listed by the cardinal compass points such as N SW ENE etc but it is usually listed in 360 degree minutes seconds steps clockwise from North 0 with East South and West being 90 180 and 270 respectively Fig i Zenith D e Meridian Line Tilt in Altitude 1809 S Rotate in Azimuth Nadir 11 OPERATING YOUR TELESCOPE Ca culating the magnification power The magnification produced by a telescope is determined by the focal length of the eyepiece that is used with it To determine a magnification for your telescope divide its focal length by the focal length of the eyepieces you are going to use For example a 10mm focal length eyepiece will give 80X magnification with an 800mm focal length telescope Focal length of the telescope 800mm ifi i l X maln cakon Focal length of the eyepiece 10mm SS When you are looking at astronomical objects you are looking through a column of air that reaches to the edge of space and that column seldom stays still Similarly when viewing over land you are often looking through heat waves radiating from the gro
20. s of the air and transparency light scattering due to the amount of water vapour and particulate material in the air When you observe the Moon and the planets and they appear as though water is running over them you probably have bad seeing because you are observing through turbulent air In conditions of good seeing the stars appear steady without twinkling when you look at them with unassisted eyes without a telescope Ideal transparency is when the sky is inky black and the air is unpolluted Selecting an observing site Travel to the best site that is reasonably accessible It should be away from city lights and upwind from any source of air pollution Always choose as high an elevation as possible this will get you above some of the lights and pollution and will ensure that you aren t in any ground fog Sometimes low fog banks help to block light pollution if you get above them Try to have a dark unobstructed view of the horizon especially the southern horizon if you are in the Northern Hemisphere and vice versa However remember that the darkest sky is usually at the Zenith directly above your head It is the shortest path through the atmosphere Do not try to observe any object when the light path passes near any protrusion on the ground Even extremely light winds can cause major air turbulence as they flow over the top of a building or wall If you try to observe on any structure or even a sidewalk movements you make may c
21. und house buildings etc Your telescope may be able to give very high magnification but what you end up magnifying is all the turbulence between the telescope and the subject A good rule of thumb is that the usable magnification of a telescope is about 2X per mm of aperture under good conditions Caiculating the field of view The size of the view that you see through your telescope is called the true or actual field of view and it is determined by the design of the eyepiece Every eyepiece has a value called the apparent field of view which is supplied by the manufacturer Field of view is usually measured in degrees and or arc minutes there are 60 arc minutes in a degree The true field of view produced by your telescope is calculated by dividing the eyepiece s apparent field of view by the magnification that you previously calculated for the combination Using the figures in the previous magnification example if your 10mm eyepiece has an apparent field of view of 52 degrees then the true field of view is 0 65 degrees or 39 arc minutes Apparent Field of View True Field of View SEN Magnification To put this in perspective the moon is about 0 5 or 30 arc minutes in diameter so this combination would be fine for viewing the whole moon with a little room to spare Remember too much magnification and too small a field of view can make it very hard to find things It is usually best to start at a lower magnification with its wider fie
22. your partner adjust the adjusting screws according to your directions while you look in the focuser After dark go out and point your telescope at Polaris the North Star With an eyepiece in the lt gt focuser take the image out of focus You will see the same image only now it will be illuminated by starlight If necessary repeat the collimating process only keep the star centered while leaking the mirror Both mirrors aligned Both mirrors aligned with with collimating cap in eye looking in focuser Cleaning your telescope Replace the dust cap over end of telescope whenever not in use This prevents dust from settling on mirror or lens surface Do not clean mirror or lens unless you are familiar with optical surfaces Clean finderscope and eyepieces with special lens paper only Eyepieces should be handled with care avoid touching optical surfaces 15 SUGGESTED READING Ymateur Astronom Beginner s Guide to Amateur Astronomy An Owner s Manual for the Night Sky by David J Eicher and Michael Emmerich Kalmbach Publishing Co Books Division Waukesha WI 1993 NightWatch A Practical Guide to Viewing the Universe by Terence Dickinson Firefly Books Willowdale ON Canada 3rd edition 1999 Star Ware The Amateur Astronomer s Ultimate Guide to Choosing Buying and Using Telescopes and Accessories by Philip S Harrington John Wiley amp Sons New York 1998 The Backyard Astronomer s Guide by Teren
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