INSTRUCTION MANUAL
Contents
1. avoid fingerprints Reassemble the 2 parts Installing the field flattener and a CCD Charge Coupled Device camera CCD cameras differ from one model to another even in the same brand name by the threads used and the body to sensor distance Accessories also have different possible threads and depths thus the combination of a CCD camera and its accessories can have any total length and any coupling thread A custom coupling ring 1s needed in order to assemble the CCD camera and its accessories called the optical train to the telescope s field flattener The custom ring should be machined to have 1 A female M62x1 thread to screw and secure the ring to the field flattener exit 2 A thread compatible with the first component of the optical train 3 A length to ensure that the distance from the back of the field flattener to the CCD sensor is exactly 75mm The 75mm distance is measured from the edge marking the start of the male thread on the field flattener to the CCD sensor see picture on the left 3 120 Field Correckr Most CCD cameras have also the distance from their body thread to CCD sensor noted in the manual thus evaluating the length of the custom ring you need can be precisely evaluated Refer to your local dealer about custom ring supply 8 Installing the field flattener and a CCD camera continued 1 Screw the drawtube adaptor 1 at the end of the focus tube 2 Screw the field flattener 22. focuser tube e Insert the 2 diagonal 2 into the focus tube and re tighten the thumbscrews 1 to hold the diagonal 1n place e Loosen the diagona s screw 3 e For 2 eyepieces 4a insert it into the diagonal and secure 1t by re tightening the thumbscrew 3 e For 1 25 eyepieces first insert the 2 to 1 25 adapter 4b into the diagonal and secure by re tightening the screw 3 Loosen the adapter s screw 5 and insert the 1 25 eyepiece 6 inside the adapter ring then secure it by re tightening the screw 5 e Make sure the locking lever below the focuser 1 is unlocked position as shown in picture e Slowly turn the focus knobs 2 one way or the other until the image in the eyepiece is nearly sharp e To finely focus the image turn the 1 11 knob one way or the other until the image is perfectly sharp 3 e Lock the screw below the focuser 1 if a heavy load is attached pull the lever at 90 The image usually has to be finely refocused over time due to small variations caused by temperature changes This often happens when the telescope has not yet reached outside temperature Refocusing is almost always necessary when you change an eyepiece When looking through a diagonal the image is inverted left to right as an image in a mirror This 1s normal and has no incidence for astronomical observations If you plan to do terrestrial observation often like bird watching optional image erecti
3. image turn the 1 11 knob one way or the other until the image is perfectly sharp 3 e Lock the screw below the focuser 1 The image usually has to be finely refocused over time due to small variations caused by temperature changes Before doing prime focus imaging 1 49 Before installing the field flattener onto the drawtube of the Helinear focuser the 2 ring adaptor 2 needs to be unscrewed and removed In order to easily unscrew the ring the blocking thumbscrew 1 at the end of the drawtube needs to be tight to lock the rotating end cap When the object you want to picture is in the middle of the circular 44mm field most often its orientation on the rectangular camera sensor is not what you expected figure A You can easily reframe the picture on the camera sensor by unlocking the thumbscrew at the end of the focuser drawtube and turning all the optical train until the framing suits your needs figure B When done relock the thumbscrew and you are ready to picture the sky 12 We want to ensure that your experience with a Sky Watcher product 1s the best 1t can be To make that happen we have a comprehensive technical and customer support available alongside with the list of distributors and dealers worldwide on our worldwide internet site http www skywatcher com Sky Watcher offers this product with the best available quality in accordance with the legislation of the local market and reserves the
4. onto the drawtube adaptor 1 3 Screw the custom ring 3 onto the field flattener 2 i g The custom ring needs to be 4 sturdy enough to secure the oo optical train to the field flattener 4 Screw vour optical train to the custom ring 3 Focusing e Make sure the locking lever below the focuser 1 1s unlocked position as shown 1n picture e Slowly turn the focus knobs 2 one way or the other until the image in the eyepiece is nearly sharp e To finely focus the image turn the 1 11 knob one way or the other until the image is perfectly sharp 3 e Lock the screw below the focuser 1 if a heavy load is attached pull the lever at 90 The image usually has to be finely refocused over time due to small variations caused by temperature changes This often happens when the telescope has not yet reached outside temperature When the object you want to picture is in the middle of the circular 44mm field most often its orientation on the rectangular camera sensor is not what you expected figure A You can easily reframe the picture on the camera sensor by unscrewing the blocking ring 1 at the end of the focuser drawtube then turning the adapter ring 2 with all the optical train until the framing suits your needs figure B When done screw the ring 1 to lock position and you are ready to picture the sky 9 Useful tips for all observations 7 Removing the finder scope During an obser
5. right to modify or discontinue without prior notice to you any model or style telescope 13
6. E seriosa ia 10 Sin A ED E I E A E E S A E NE E ET 10 ROUNE tHe TOCUS Tenn E E 10 SPE O a E E EE 11 Telescope spec Meat ONS zada s gt 11 Tpreads specifications ok n Error Bookmark not defined Different releases The Helinear Focuser 0 0 ccccccccscssesessesesceseseetesesessesesneseseeneseseens 122 Focusing withthe Hellner 1061801 srren r roh 22 Bel Ore domne pr sne LOCUS Ima nina is o n 122 Framing a pictiire with the Helnedr106 S0 ik o 122 Introduction The spirit of perfection by Sky Watcher Designed with the discerning astronomer in mind Sky Watcher top of the line Esprit refractors deliver the kind of imaging performance one would expect from telescopes costing much more With their three element air spaced objective lens design false color is completely eliminated yielding exceptional contrast and sharpness The 3 CNC machined 1 11 rotatable dual speed linear power focuser provides a smooth rock solid focusing with zero image shifts The Esprit ED 120mm refractor comes with a 9 x 50 right angle finder scope 2 inch Star diagonal D style dovetail eyepiece retractable dew cap and padded case Everything you need to get out under the stars The 2 element thread on 48mm field flattener guarantees excellent field flatness across the entire 44 mm imaging plane Its oversized lenses ensure a larger and clearer aperture and also extremely minimized halation Quick overview 120 mm apochromatic 3 element refracto
7. INSTRUCTION MANUAL ESPRIT 120 ED Super APO E Sky Wai her Be amazed ES120 F 141120V2 EN Copyright Sky Watcher Table of contents toda HON E E tre ener nto en Ren ee 2 S Ci acecsctecsetacacecaceacnecasatatacaca es secetaeted ca vu da tavesiaesatasdeaceuatsueicttacdpbeancueiea sentasetipesaeceaaesiaae 3 Pans desc IU OU ssa kia nA ra 3 Wnpackine the telescope eranan a ec cede Error Bookmark not defined Preparing the telescope Tor an ObBServallom s oistsis ni uknie n s k hasa k olala indie knot 3 CGO AT TINS TE LS SCO Pe state o tao 4 PT SM MINS PING CL SCOP ius ho o acne ce eee ee 5 Using the telescope for visual ODSerVatlON 0 ccccccesesceseseeteseseeeseseesesesteseseeesestenesen 6 TASCA GANG CY CPC CC xe tats nn 6 FOCUS nnana eared lecbae nee alasial ee cemauacese a ne eeaasaans 6 Using the telescope for prime focus IMAGING ccccscesesesteseseetesesteseseetesesesteseseenesen 7 Installing the field flattener and a DSLR Digital Single Lens Reflex camera ooorrnnnnom 7 Installing a 48mm filter inside the focal extender ccononnceceien a a 8 Installing the field flattener and a CCD Charge Coupled Device camera oooooooonnn vvn 8 Installing the field flattener and a CCD camera continued cc ceesssseeeeeeeeeeceeeeeeeeeeeeeaaaaaseeeeeees 9 EOC E piko O bono 9 Pad ne NETE EE tt O A ete AS 9 Us iti ps forall Observa ON irsscseestenties ON 10 Removme the tndet SCOP
8. d o 2 of The 9x50 erect image finder scope with tube rings and mount The 2 50 8mm diagonal 3 The 2 element thread on field flattener used for photography only guarantees excellent field flatness across the entire 44 mm imaging plane allowing picturing the sky with large sensors 4 Field flattener extender tube for DSLR camera used to place the camera exactly on the corrected focal plane The field flattener extender tube for DSLR may be in one solid piece or two pieces N me screwed together depending on the dealer s country Please refer to page 7 for further information f 2 eyepiece f 28mm 6 Thread on field flattener adaptor used to install the field flattener on the focuser s drawtube 3 Some parts may be optional depending on the dealer s country 1 Please check with him if any doubt i Sky Watcher offers this product with the best available quality in accordance with the legislation of the local market This can lead to small differences over time and depending on the area of sale in the world These differences do not influence the overall quality which is of the high standard guaranteed by Sky Watcher worldwide Preparing the telescope for an observation Cooling the telescope A Upon delivery and when not used the telescope and its accessories are inside the aluminum padded case note the case may be different from the picture depending on your dealer s coun
9. ng devices such as the Amici prism or the erected 90 diagonal may be the right tool Your reseller will be glad to advise you about the best optional part that can be used with your telescope 6 Using the telescope for prime focus imaging Before installing the field flattener onto the drawtube of the focuser the 2 ring adaptor 2 needs to be unscrewed and removed In order to easily unscrew the ring hold with one hand the ring 1 at the end of the drawtube and then unscrew the 2 ring adaptor 2 with the other hand The Sky Watcher ESPRIT 120 Field flattener has been specifically designed for your telescope It guarantees excellent field flatness across the entire 44 mm imaging plane and ensures full illumination with extremely minimized halation and zero color fringing even on bright objects No universal field flattener available on the market will deliver the premium results achieved with the Sky Watcher ESPRIT 120 Field flattener which is designed exclusively for this telescope ee es ee se lila Installing the field flattener and a DSLR Digital Single Lens Reflex camera pm 1 Screw the drawtube adaptor 1 at the end of the focus tube 2 Screw the field flattener 2 onto the drawtube adaptor 1 3 Screw the extender tube 3 onto the field flattener 2 If your extender tube has two parts screwed together 3a 3b please check the two parts are secured tight before inserting them in the o
10. ope Visual Backfocus Field Flattener Backfocus Threads specifications The 2 parts Extender threads Refractor air spaced triplet APO Thread on 2 lenses 120 mm 4 72 in 840 mm 33 in 7 9x50 erect image right angle 2 dielectric coatings With 3 D Style dovetail plate 283 X IX 12 9 1 16 arc seconds 0 97 arc seconds 294 x Fully multi coated 44 mm 1 7 in 16 2 cm 30 1n 10 kg 23 Ibs gt 225mm 8 86 in 75mm 3 in Full DSLR train with single part Extender or d corrector of ED M74x1 M65x1 M62x1 Li with two parts Extender screwed together Threads Tube Adatpor Flattener Ext Tube T Ring mo aa _M65x1 F Moxi F M48x075F n a 7 mm 7 5 mm 8 5 mm ene 6 mm M48x0 5 The visual back focus of the telescope is the distance from the end of the focuser tube with 2 adapter installed to the focal plane This means all accessories needing 225mm back focus or less can be installed The back focus of the field flattener is the distance from the back of the field flattener to the focal plane 11 Different releases The Helinear Focuser Some of the first ESPRIT 120 series were delivered with a different focuser the Helinear focuser Focusing with the Helinear focuser e Unlock the locking screw below the focuser 1 e Slowly turn the focus knobs 2 one way or the other until the image on the eyepiece or the camera sensor is nearly sharp e To finely focus the
11. ptical train Screw the enlarged 48mm T Ring 4 onto the extender tube 3 5 Install your DSLR camera on the 48mm enlarged T Ring 4 see note below J The enlarged 48mm T Ring may not be included with your telescope and should match 4 A your DSLR camera s manufacturer and model Please check with your reseller to get the 7 correct 48mm Enlarged T Ring for your DSLR camera 2 NHL ee ll se In order to get the premium results the field flattener for ESPRIT 120 can deliver the distance between the last lenses to the sensor should be exactly 5mm This 4 distance 1s called the field flattener back focus c The rings are designed to provide 75mm of back focus with any DSLR camera Modifications to this layout 1 e by adding a radial guider will lead to blurry stars images in the field edges Installing a 48mm filter inside the focal extender A 48mm 2 filter can be mounted inside the DSLR extender tube if needed By example using a light pollution reducer filter may allow pictures of the night sky even in suburban areas Single part Extender Inside the focal extender 2 parts Extender Please unscrew the two a 48mm thread receive parts of the Extender any Sonn Ea EEE Insert the filter inside Insert the filter and screw the 48mm inner thread it on the thread Do not of the second part over tight the filter Do not over tight the Use a tissue when filter screwing the filter to
12. r 840 mm f 7 Metallic high transmission lens coatings 3 CNC machined 1 11 dual speed focuser Zero color fringing even on bright objects 44 mm image circle Knife edge Baffled Optical System 2 Diagonal with dielectric coatings 9x50 erect image 90 finder scope Tube rings with dovetail D Losmandy style bar Aluminum foam lined case Thread on field flattener Full frame corrected focal plane NEVER USE YOUR TELESCOPE TO LOOK DIRECTLY AT THE SUN PERMANENT EYE DAMAGE WILL RESULT NEVER USE AN EYEPIECE TYPE SOLAR FILTER NEVER USE YOUR TELESCOPE TO PROJECT SUNLIGHT ONTO ANOTHER SURFACE THE INTERNAL HEAT BUILD UP WILL DAMAGE THE TELESCOPE OPTICAL ELEMENTS USE A PROPER SOLAR FILTER FIRMLY MOUNTED ON THE FRONT OF THE TELESCOPE FOR VIEWING THE SUN WHEN OBSERVING THE SUN PLACE A DUST CAP OVER YOUR FINDERSCOPE OR REMOVE IT TO PROTECT YOU FROM ACCIDENTAL EXPOSURE NEVER LET A TELESCOPE POINTING THE SUN UNATTENDED Getting started Parts description Retractable dew cap Tube rings D Losmandy dovetail bar 9x50 erect image 90 finder scope 3 1 11 dual speed focuser 2 dielectric diagonal 7 2 eyepiece f 28mm a sa S RNA Unpacking the telescope Your telescope is inside the sturdy aluminum padded case designed to securely carry the telescope and the tube rings The case contains and protects the telescope and its accessories Once open you will find alongside the telescope with dew cap retracte
13. t to the center of the field The alignment should be done at first use and over time if the alignment is no more accurate Alignment is best done outdoors in day light when it s easier to locate objects If it is necessary to refocus your finder scope sight on an object that 1s at least 500 meters or yards away 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 Choose a distant object that is at least 500 meters or yards away and point the main telescope at the object Adjust the telescope so that the object is in the center of the view in your eyepiece If you are using the star diagonal the image will be left right inverted like images in a mirror Having an erected image the view you have in the finder scope has the same orientation as the landscape Check the finder scope to see if the object centered in the main telescope view is centered on the crosshairs If not unscrew the three blocking rings on the rear ring then adjust the three small screws to center the finder scope Do not over tighten the screws when aligning the finder scope When the finder scope 1s correctly oriented screw the three blocking rings 1n position Using the telescope for visual observation Inserting the eyepiece Focusing e Loosen the two thumbscrews 1 on the end of the
14. try Unpack the telescope and assemble it to your mount using the included D Losmandy style dovetail bar Please refer to your mount manual to properly install the telescope B To extend the dew cap unscrew the two screws on the aluminum ring 1 then gently pull the dew cap forward 2 When in position tighten the two screws to ensure the dew cap stays in position 3 C The 9x50 erect image finder scope is a small fixed magnification scope mounted on the optical tube When 1t 1s correctly aligned with the telescope objects can be quickly located and brought into the field of telescope see also Aligning the finder scope chapter on next page To install the finder scope on the telescope insert the positive dovetail of the finder scope support inside the negative dovetail mounted on the focuser as shown in picture Telescopes require time to cool down to outside air temperature This may take longer if there is a big difference between the temperature of the telescope and the outside air This minimizes heat wave distortion inside telescope tube tube currents Your telescope would require at least 25 minutes cooling off to outside conditions Tip use this time for planning your session and mount accessories Aligning the finder scope The 9x50 erect image finder scope is a small fixed magnification scope mounted on the optical tube When it is correctly aligned with the telescope objects can be quickly located and brough
15. vation when the desired target is acquired it is possible to remove the finder scope from its support When needed the finder scope can be inserted again This can be useful when the observer s head is in a position where the finder scope becomes an obstacle to observation 7 Using the indexed scale The indexed scale on the focuser drawtube gives an accurate indication on the focus position for various accessories Once the position for one accessory is known it is very easy to approximate the focus position Due to the precision needed to reach perfect focus a fine tuning is advised Aa Rotating the focuser The whole focuser body can be rotated It is useful when the focuser knobs aren t in a convenient position 1 Remove all accessories from the focuser Fully retract the drawtube inside the focuser body Unscrew the boat wheel like large aluminum ring Rotate the focuser body Tight back the boat wheel like large aluminum ring S v v 10 Specifications Telescope specifications Optical Design Field Flattener Aperture mm Focal Length Focal Ratio Finderscope Diagonal Tube Rings Highest Useful Magnification Lowest Useful Magnification Limiting Stellar Magnitude Resolution Rayleigh Resolution Dawes Light Gathering Power Compared to Human Eye Optical Coatings Fully Illuminated Field With Field Flattener Optical Tube Length Retracted Dew Cap Optical Tube Weight Telesc
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