Orion 72MM User's Manual
Contents
1. focus rotation lock ring clockwise To ensure a secure lock it is sometimes necessary to grab hold of the entire focuser assembly and firmly rotate it clockwise bracing your other hand against the stationary portion of the optical tube The 72mm EON refractor has screw holes for an optional finder scope dovetail base attached to the rotating portion of the focuser allowing you to change the orientation of the finder scope as desired The EON 72mm uses a single thumbscrew instead of a lock ring to lock the focuser rotation To rotate the focuser on the EON 72mm loosen the focuser rotation lock thumb screw and rotate the focuser to the desired orientation Lock the focuser in place by tightening the focuser rotation lock thumbscrew Focus tension set Focus lock thumbscrew Figure 3 Adjustments can be made to the focus tension set screw using the provided 2 5mm hex key Tightening the focus lock thumbscrew will stop the focuser drawtube from moving Using 1 25 and 2 Accessories Your EON refractor can accommodate both 1 25 and 2 accessories including just about any eyepiece diagonal or camera The Crayford focuser has a 2 eyepiece holder with a 1 25 eyepiece adapter installed Figure 4 Both the 2 eyepiece holder and 1 25 eyepiece adapter feature a brass compression ring to hold your accessories in place The brass compression ring securely holds the 1 25 or 2 accessory in place without marking its metal barrel2. or backward within the mount s dovetail holder You can also move the telescope forward or backward within the tube rings The tube rings offer the most adjustment range Loosen the tube ring clamps Figure 1b slightly and slide the telescope tube forward or backward as needed to reach optimum balance then retighten the tube ring clamps Using Different Eyepieces The EON refractors work well with virtually any 1 25 or 2 eyepiece Because the EON refractors implement high qual ity ED optics the eyepieces you use should also have excel lent fully multi coated optics to utilize the full performance of the EON The diagonal used should also be a quality 90 mirror with high reflectivity It is desirable to have a range of eyepieces of different focal lengths to allow viewing over a range of magnifications To calculate the magnification or power of a telescope simply divide the focal length of the telescope by the focal length of the eyepiece Telescope Focal Length mm _ Magnification Eyepiece Focal Length mm For example the EON 80mm ED which has a focal length of 500mm used in combination with a 25mm eyepiece yields a power of 20x 500mm 25mm 20x If all outside viewing conditions are ideal every telescope with good optics supports a maximum of about 60x per inch or 2 4x per millimeter of aperture Keep in mind that at higher powers an image will always be dimmer and less sharp this is a fundamental l
3. to free the dovetail plate then reposition the telescope and retighten the screw s If you are using a camera tripod or telescope mount and need additional balance adjustment the orientation of the mounting block can be reversed This is especially helpful when using heavy accessories such as 2 eyepieces or DSLR cameras To reverse the orientation of the mount ing block remove the screw using a 4mm hex key that attaches the mounting block to the telescope tube and turn it around 180 Figure 9 Once the mounting block orienta tion has been reversed reattach the screw Figure 9 For a greater range of balance on the EON 72mm and 80mm switch the direction of mounting block using a 4mm hex key Connecting the EON 120mm to a Mount The EON 120mm refractor includes a preinstalled pair of tube rings and a dovetail mounting plate ready to attach to a heavy duty telescope mount The dovetail plate is compat ible with many Orion telescope mounts The dovetail plate is also compatible with many other available mounts To con nect the EON 120mm to a mount loosen the attachment screw s on the mount s dovetail holder until the screw s provide enough clearance for the dovetail mounting plate Carefully place the dovetail plate flat against the top surface of the dovetail holder of the mount and tighten the attach ment screw s securely Balancing the EON 120mm can be achieved by sliding the dovetail mounting plate forward
4. INSTRUCTION MANUAL Orion EON Apochromatic ED Refractors 9781 EON 72mm 9927 EON 80mm 9925 EON 120mm R Customer Support 800 676 1343 _ ORIONI E mail support telescope com TELESCOPES amp S amp BINOCULARS Corporate Offices 831 763 7000 Providing Exceptional Consumer Optical Products Since 1975 89 Hangar Way Watsonville CA 95076 IN 326 Rev A 01 08 Congratulations on your purchase of an Orion EON ED Apochromatic Refractor optical tube assembly The exceptional optical and mechanical quality of your EON refractor will provide you with a pleasing telescope experi ence The ED glass in the objective lens yields extremely sharp high contrast images with virtually no color distor tion compared to a standard refractor The smooth and fine movement of the dual speed Crayford focuser allows for easy and precise focusing These instructions will help you use your EON refractor optical tube assembly Focus rotation lock ring for EON 80mm only 2 Eyepiece holder Finder scope dovetail base for EON 80mm only Dew shield aN icunting block 125 Eyepiece adapter Fine focus knob Coarse focus knob Figure 1a The EON 72mm and 80mm ED Refractor optical tube assembly Parts List EON 72mm amp 80mm Optical tube assembly Dust Cover 1 25 eyepiece adapter 2 5mm hex key Hard carrying case EON 120mm Optical tube assembly Dust Cover 1 25 eyepiece adapter Tube rings quan
5. Orion and directly fits the holes in the EON 72mm Figure 5 Holes for optional finder scope dovetail base Figure 5 The EON 72mm is compatible with the Orion finder scope dovetail base To insert a finder scope onto your EON refractor slide the finder scope bracket into the finder scope dovetail base and secure it in place by tightening the thumbscrew s on the dove tail base Figure 6 Figure 6 Slide the finder scope bracket into the finder scope dovetail base and secure the locking thumbscrew s Operating the EON Refractor Now that you have become familiar with the different fea tures and functions of your EON refractor you are ready to begin using your new telescope outside under a starry night The EON refractors are essentially ready to begin observing with immediately There is a small period of time where the internal temperature of the telescope must match the out side temperature to obtain the best image quality This time period is nearly nominal taking only a few minutes Typically the EON will have reached outside temperature by the time the telescope is setup _ Dovetail plate 1 4 20 threads Figure 7 The EON 72mm and 80mm have a built in mounting block ready to connect to a sturdy camera tripod or telescope mount 4 Connecting the EON 72mm and 80mm to a Tripod or Mount The EON 72mm and 80mm have a built in mounting block ready to connect to a sturdy camera tripod or telesc
6. The telescope must be used with either a diagonal or exten sion tube in order for the eyepiece to reach focus In most cases you will be using a 90 star diagonal for visual use with an eyepiece To attach a 1 25 diagonal or extension tube to your tele scope 1 Remove the dust cap from the 1 25 eyepiece adapter 2 Insert the barrel of your diagonal or extension tube into the 1 25 eyepiece adapter 3 3 Secure the barrel in place by firmly tightening the thumbscrew on the 1 25 eyepiece adapter To attach a 2 diagonal or extension tube to your telescope 1 Loosen the thumbscrew on the Crayford focuser s 2 eyepiece holder and remove the 1 25 eyepiece adapter 2 Insert the barrel of your diagonal or extension tube into the 2 eyepiece holder 3 Secure the barrel in place by firmly tightening the thumbscrew 1 25 Eyepiece adapter thumbscrew 2 Eyepiece holder thumbscrew Brass compression ring 2 Eyepiece holder 1 25 Eyepiece adapter Figure 4 The EON refractors accept both 1 25 and 2 accessories The brass compression rings in the 1 25 eyepiece adapter and 2 eyepiece holder ensure a secure fit without marking up the barrel of your accessory Finder Scope Compatibility The included finder scope dovetail base on the EON 80mm and 120mm refractors are ready to accept any Orion finder scope The EON 72mm does not include a finder scope dovetail base however it is available optionally from
7. anty does not apply if in Orion s judgment the instrument has been abused mishandled or modified 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 89 Hangar Way Watsonville CA 95076 800 676 1343
8. aw of optics In most cases the steadiness of the air the seeing will limit how much magnification the scope can tolerate rather than the tele scope itself Always start viewing with your lowest power longest focal length eyepiece in the telescope After you have located and observed the object with it you can try switching to a higher power eyepiece to ferret out more detail if atmo spheric 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 over magnified image Imaging with the EON Refractors The EON refractors make very capable astrographs for your CCD or DSLR camera To attach a DSLR camera all you will need is the appropriate T ring for the make and model of your camera and a 2 prime focus camera adapter avail able from Orion Simply attach the T ring to the camera body and thread the 2 prime focus camera adapter into the T ring Insert the barrel of the camera adapter into the 2 eyepiece holder on the EON focuser Figure 10 and secure it with the thumbscrew Most CCD cameras will have a 1 25 or 2 barrel ready to attach directly to your telescope like an eyepiece or diagonal No adapter is required simply insert the barrel of the CCD camera into the 1 25 or 2 eyepiece holder and secure the came
9. d outward until it stops Figure 2 Figure 2 Gently pull the dew shield outward until it stops 2 Dual Speed Crayford Focuser The high quality dual speed 2 Crayford focuser is one of the most important components of your EON refractor The Crayford design allows for smooth precise focusing without any image shift that typical rack and pinion designs experi ence For quick focusing of your EON refractor the two larger focus knobs will provide a coarse focus For more precise focusing as needed for applications such as critical high power planetary observing and digital imaging the smaller black focus knob Figure 1a offers fine focus adjustment The fine focus knob rotates eleven times to one single rota tion of the coarse focus knobs making an 11 1 ratio for extremely precise focusing The dual speed Crayford is capable of handling the weight of heavy accessories such as large 2 eyepieces or a CCD or DSLR camera Adding tension to the focuser drawtube will further increase the amount of weight the focuser can handle without slipping To adjust the focuser drawtube ten sion locate the focus tension set screw on the underside of the focuser Figure 3 Using the 2 5mm hex key turn the set screw clockwise until you have added the appropri ate amount of tension for your needs In some cases you may want to loosen the tension which will also decrease the resistance of the focus knob movement Simply turn the focus tensi
10. e carrying case when not in use 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 anodized surface that should resist scratches and smudges If a scratch does appear on the tube it will not harm the tele scope Smudges on the tube can be wiped off with standard household cleaners Dew When you are ready to pack up your telescope at the end of the night avoid immediately storing it in the hard case if you encountered heavy dew and the telescope is damp Instead bring the telescope inside and allow the moisture on the tele scope to evaporate If dew forms on the objective lens then leave the dust cover off of the telescope until all the moisture has evaporated Once the telescope has completely dried out place it in the hard case Cleaning Optical Surfaces In general your telescope will only need to be cleaned on a very minimal basis Dust particles on the objective lens do not effect the optical quality of your EON Loose dust can simply be blown off with air using a compressed air can or blower bulb available from Orion Any remaining dust is best left alone unless the build up is extreme Finger prints and water marks should be cleaned from your telescope s objective lens Any quality optical lens tissue and cleaning fluid spe cifically designed for multi coated optics can be used to clean the telescope s objective lens as well as the l
11. enses of your eyepieces and finder scope Never use regular glass cleaner or cleaning fluid designed for eyeglasses Before cleaning with fluid and tissue however blow any loose particles 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 fingerprints and smudges may be removed using this method Use caution rubbing too hard may scratch the lens Clean only a small area at a time using a fresh lens tissue on each area Never reuse tissues Specifications EON 72mm ED Apochromatic Refractor Optical tube Seamless aluminum Objective lens Apochromatic rear element made of FPL 51 ED glass air spaced Objective lens coating Fully multi coated Lens cell Machined aluminum Focal length 430mm Focal ratio f 6 0 Baffles 2 knife edge baffles Focuser Dual Speed 11 1 Crayford accepts 1 25 or 2 accessories brass compression ring Mounting Mounting block dovetail design 1 4 20 threaded Weight 5 0 Ibs 2 27 kg Length 12 5 31 75cm with dew shield retracted Outside Diameter 3 43 87mm EON 80mm ED Apochromatic Refractor Optical tube Seamless aluminum Objective lens Apochromatic rear element made of FPL 53 ED glass air spaced Objective lens coating Fully multi coated Lens cell Mac
12. hined aluminum Focal length 500mm Focal ratio f 6 25 Baffles Cone baffle Focuser Dual Speed 11 1 Crayford accepts 1 25 or 2 accessories brass compression ring Mounting Mounting block dovetail design 1 4 20 threaded Weight 6 5 Ibs 2 95 kg Length 15 25 38 74cm with dew shield retracted Outside Diameter 3 54 90mm EON 120mm ED Apochromatic Refractor Optical tube Seamless aluminum Objective lens Apochromatic rear element made of FPL 53 ED glass air spaced Objective lens coating Fully multi coated Lens cell Machined aluminum Focal length 900mm Focal ratio 7 5 Baffles 3 knife edge baffles Focuser Dual Speed 11 1 Crayford accepts 1 25 or 2 accessories brass compression ring Mounting Tube rings and dovetail plate Weight 14 31 lbs 6 49 kg Length 31 25 79 38cm with dew shield retracted Outside Diameter 3 54 122mm One Year Limited Warranty The Orion EON Refractor is warranted 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 purchaser only During this war ranty 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 This warr
13. olor distortion Whenever light passes through one material to another different wavelengths color are bent by different amounts This is a problem that plagues refractor type telescopes since light passes through both air and glass to form an image Most astronomical objects emit a spectrum com prised of many different wavelengths of light so each wavelength will be bent by a slightly different amount when passing through a lens This results in each color of light reaching precise focus at a slightly different point which will provide a soft image with a halo of unfocused color The EON is designed to minimize chromatic aberration The objective lens is actually comprised of two individual lenses the crown front element and flint rear element The EON features a flint glass element made of high performance ED glass The use of this ED glass minimizes the amount of chromatic aberration resulting in a much more pleasing view as compared to refractors that do not have ED glass Critical stellar or planetary observations become more accu rate with this color correction since the focus is sharper with no unfocused false or unwanted color around the object The ED optics will render true high contrast images Care amp Maintenance Give your telescope reasonable care and it will last a lifetime When not in use keep its dust cover on as well as the dust cap on the eyepiece opening Keep the telescope inside the hard storag
14. on set screw counter clockwise as needed to loosen the focus drawtube tension Tightening the focus lock thumbscrew Figure 3 will prevent the drawtube from moving This feature can be utilized for imaging or visual use when you have achieved focus and do not want the drawtube to move While you are focusing make sure the focus lock thumbscrew is loosened or the drawtube may not move properly Note Applying too little tension on the focuser will result in the focus drawtube to slide under its own weight or under the weight of your accessories installed Make sure there is enough tension to support your 2 or 1 25 accessories Focuser Rotation The focuser assembly on the EON refractors have the abil ity to be rotated Under normal use you should not have to rotate the focuser since the eyepiece and diagonal can be rotated instead However focuser rotation can be ben eficial for changing the camera orientation while imaging see Imaging with the EON Refractors Additionally this feature can allow you to keep the focus knobs parallel to the ground no matter how your telescope is positioned This can be especially convenient when the telescope is mounted in different orientations causing the focus knob orientation to change To rotate the focuser turn the focus rotation lock ring Figure 1a counter clockwise until the assembly loosens Rotate the focuser to the desired orientation Lock the focuser in place by turning the
15. ope mount Figure 7 The mounting block is threaded to accept a common 1 4 20 stud found on almost any camera tripod To connect the EON 72mm or 80mm to a camera tripod simply screw the 1 4 20 stud found on your camera tripod to the underside of the EON s mounting block The EON 72mm has three different holes to choose from and the EON 80mm has two holes Pick the 1 4 20 hole that pro vides the best balance on your tripod The mounting block also functions as a dovetail plate which is compatible with many Orion telescope mounts The dove tail plate is also compatible with many other mounts To con nect the EON 72mm or 80mm to a telescope mount loosen the attachment screw s on the mount s dovetail holder until the screw s provides enough clearance for the dovetail mounting plate Align the mounting block with the dovetail holder and slide it forward Figure 8 Tighten the attachment screw s on the dovetail holder of the mount y 4 i 9 50 Taa 60 70 or M Figure 8 Align the mounting block with the dovetail holder and slide it forward Tighten the attachment screw s on the dovetail holder of the mount For the best stability and motion on your mount the EON should be balanced front to back If you are using the mount ing block as a dovetail plate then balancing the EON simply requires sliding the telescope forward or backward in the dovetail holder as needed Loosen the attachment screw s on your mount just enough
16. ra with the thumbscrew The EON ED refractors were designed to reach focus with both DSLR and CCD cameras However every camera s focus point is a little different Depending on your camera you may need to use an extension tube for your particular imaging setup Any imaging accessory such as a color filter wheel increases the amount of inward focus travel required Before attaching any extra imaging accessory try reaching focus first with the camera directly attached to the focuser then see if you have enough inward focus travel left for extra accessories 2 Eyepiece DSLR holder 2 Prime focus camera adapter Camera T ring Figure 10 To attach a DSLR camera attach the T ring to the camera body then thread the camera adapter to the t ring Insert the camera adapter barrel into the 2 eyepiece holder on the focuser and tighten the attachment thumbscrew Imaging equipment is sometimes heavier than a diagonal and eyepiece The dual speed Crayford focuser is capable of handling the weight of your CCD or DSLR camera Adding tension to the focuser drawtube will increase the amount of weight the focuser can handle Install your camera onto the focuser during the day Check the focuser for any slippage If the focuser drawtube slips under the weight of the camera you will need to add more tension to the focuser by tighten ing the focus tension set screw Note About Chromatic Aberration Chromatic aberration literally means c
17. tity 2 Dovetail mounting plate 2 5mm hex key Hard carrying case Getting Started Your EON refractor is fully assembled from the factory The optics have been installed and collimated so you do not need to make any adjustments to them We recommend keeping all of the original packaging In the unlikely event you should need to ship the telescope back to Orion for warranty repair service you should use the origi nal packaging to ensure the telescope stays intact during shipping Take a moment to inspect the telescope and all of its parts Tube rings Tube ring clamps Finder scope dovetail base Dovetail mounting plate Figure 1b The additional features of the EON 120mm ED Refractor optical tube assembly Functions and Features The EON refractors have several features designed to maxi mize the use and enjoyment of your telescope When you have become familiar with all of the functions of your EON refractor you will be ready to begin using your new tele scope under the night sky Retractable Dew Shield All EON refractors feature a retractable dew shield which allows the telescope to become more compact for stor age The dew shield s primary purpose is to prevent dew water condensation from forming on the lens during cold and humid nights The dew shield is also useful for reduc ing glare under unwanted outside lights To extend the dew shield remove the optical tube dust cover then pull the dew shiel
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