Mewlon300 Manual

8/12/2019 Mewlon300 Manual

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Dal l Kirkham Cassegrain

-300INSTRUCTION MANUAL

TAKAHASHI


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ThankyouforpurchasingMewlon300Dall-KirkhamCassegrain telescope. TheMewlon300hasbeendesigned to be used lor highmagnification tunarandplanetaryobservationand deepsky Imaging Inordertouse theMewlon-300tothelimitof Itscapabililles,pleaseread this instructionmanualcarefullyalldunderstandittholoughly before usingthe instrument. Improperusage maycause malfunctions01 dam age totheinstrument. EveryMewton-300hasbeen inspectedthoroughlybeforeshipl)ing:however,ifyouhave noticedanydefectswiththeInstrument,pleasecontact yourloc81 distributora soon81 possible.

"I . . WARNINGNEVER ATTEMPT TO OBSERVE THE SUN THROUGHTHIS TELESCOPE WITHOUT A FUl l APERTURE SO-l R FilTER DESIGNED FOR THIS PURPOSE FAil_URE TO DO SO COULD CAUSE INSTANT BLINDNESSCOVER THE FINDER WITH AN OPAQUE COVER TOPREVENT ANY LIGHT FROM COMING THROUGH ANUNCOVERED FINDER CAN ALSO CAUSE SERIOUSDAMAGE TO THE EYE. KEEP CHILDREN AWAY FADMTHE TELESCOPE DURING DAYTIME

, , IS

6 CAUTION When placingtheMewlon300inthesaddle,becarefull to balancethe

tubeinthesaddle. Thiswillpreventinjury to fingerSandwillpreventitIrom fallingto theground When placingthetelescopeinthesaddle,alwayshold thetubewith one handto keepit from falling offthesaddleonto theground.

Always laythetubeassemblyonacompletely flal surfacethattotallysupports it to protectit from damage.

KeepthelUbeassemblyout of theSun. Otherwise,thetubeassemblycould heatup,causinglensdamage.

Greatcareshouldbetakenduring focusing.- 2-


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CONTENTS

Warning & Caution 2Contents 3Specifications 4Mewlon Features 5Tube ssembly Layout 6Attaching The Finder And Tube ssembly ...... 7Focusing 9Tube Currems nd The Ventilated Mirror Cell 12Finder lignment 14Collimation ,................. 16Observations ,.......................................... 21Accessories lor Photo!Visual Application 24Care & Maintenance 28Photo ImagingNisual Chart 30Trouble Shooting 31


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S c c 0 S

OpticaI Sys emCo figuration Dall-kirkham CassegrainEffective Ape ure 300mmEffective Focal Leng h 3572mmEffective Focal Ratio 1: 1.9Secondary Mirror if 88mmResovi Drower 0.4Limiting Mag itude 14 2Ugh Gathering Power 1837X

Measu emen sDiameter 0 Main Tube 324mmTotal Length of Ma n Tube 1094mmWeight of Main Tube Assembly A prox. 24 91


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Electric DeuserThe Mewlon 300 u as a n electric focusingsystem th t moves the secondary. The advantage of this type of system is tha hefocusing of the sttument is done withoutthe, ube ever being touched to eliminate anyvibration and image shift.High magnification focusi 9 is m de simp eand 'the lac of mage shift n s u n ~ s precisefocus. Refer to the' page 10.

Mirror Venti lation Sys,emBefore the Mewlon 300 c p,erform 0 theIi it 0 its capabilities, the optics m st eq ze 0 the ambie t tempera ure of the out-side air. Instruments of this size nor allya e a good deal of time to e _alize. The

ewlon-300 uses a special y designed ventilation system' he employs a lattice primarycell with a removable rear cover that allowsair 0 flow over the ear of the prim y mir-ror and side vents above' he surface of themirror that aIlows air to flow over he surace of the pr'mary. This combination al ows

the Mewl'on-300 'to cool more rapidly.Imag ng

The Mewlon will support digital, CeD andp 0 agraphic rmaging, of lu ,ar, p ne ry

nd deep sky objects.

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Tube ssembly Layout IIII

'.,

I ,-

_ FOQIM C s ..


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Attaching The Finder And Tube Assembly

The MewlonJOO is shipped with the finder Anaching The Finder Scopedetached to plIlVenl damage during ship- Piece the finder bracket OVBr the holes inping. Use the following instructions 10 the focuser assembly and attach it with theassemble end align the finder two Allen bolts provided. Make tert in thatthe sides 01 thlt bracket I' parallel to Ihesides 01 the tube assembly Failure to do sowill make find alignment more difficult Acap screw covers the illuminator hole. Refor 10 fig.2 3.

A1i....... .nt S


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,Attaching The Mewlon-300 ToAn Equa orial MountThe Mewlon-300 can be used with theTakahashi EM-500 higbes capacity, EM 4QOslightly lower capacity and the JP. A achthe L-plate [accessory plate illustrated] tothe top of the Dec. assembly of he mountas shown. Then place the tube assemblyinto he tube rings which have been positioned parallel 0 he ground. Then holdingthe tu e, place the op parts of e tube ringsover the top of the tube and secu re themwi h the bolts provided, but do not tighten

em comp etely. Leave them loose e oughto allow t e tube to be moved 0' balance i tAfter the tube has been placed into t e tuberings a d secured, he front cover shouldbe removed and then all accessories shouldbe attached to al:low for proper bala cingby moving he tube nd tube weigh to the

Tube Hold ..

ttach he acceSSQrySide Pia e plate on the mO\lf1 aftere ube hold rs ar seton i t R 5

WarningWhen placing th Mewlo -300 [rno he ube rings itbest to have another person to assrst with the recess. Remember to keep the tub weight tightened.FaTlure to do so could allow the weig t to fall off

eight rack and injure your leg or foot.

Allen Bolt

/et the u e ss y with thecounterweight rail f r n ~ downward.

best balance position.It is co venient 0 leave the tube rings attached a the moun.

Rail

Lock Sarew Counter-weightFig.7

Tuhe Ass'yCounter-Wei Lock Screw Fig.8

Attach the tube weight to the weight rail asillustrated in the diagram.However, if the' ewlon wIll be used orimaging, loosen the weight and move it towards the front of the tube and then findhe balance point and tigh en he set screw

on he weight.Ma e certain that all tube weight[s] and asmany accessories tha are s l le r havebeen a ached to he scope as well as removing he front cover before placing hetelescope into he tube holder.-


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FocusingThe optical configuration 1 the MewlonJOOemplovs I moving secondary 1 .chlevelocus and 81. result the sPlIcing betweenthe primary and secondal'( are chllnged lindIhe fOQlllength will vary l i th Mewlon isfocused 1 1 diffellnl cc::enories. Best fo-CUI i aChieved bV moving the locul lubeto the mark inscribed for Ihe accessory being used to achieve .ough focus llnd Ihllnmoving the Hcondrll'( with the electric 10-euser to chieve critical focus. ThIs method1 focusing minimiles Ihe rT\O\Iernenl of theM


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How 0 use he elec ic focuserFocusing can be made by moving the secondary mirror electrically by the motor,which is controlled by a hand held co - 0]bo .The advantage of using an electric focuserthat moves the secondary is moved and im-age shift is ze 0 as well as not having toouch the tube assembly which does away

wi h any ube vibration that caul hindercritical focus. This total lac of vibration allows focusi g at very high magnification,A ' er placing the tube into the tube hoi er,and balancing, I sert he connector a thefoe s con rol j to t 18 receptacle loca ed atthe rear of t e ube on the nderside.

Insert the connector Corm c;loranowed to the do Fig 10When the focus button [IN](red) s pressed,the secondary ml ror moves inw rd nd thefoea point comes outward. When the bu -ton [QUT](white)is pressed, the seeo darymirror moves outward and t e ocal po'ngoes inward. If you wan 0 move the foeaplane a elatively great distance, keep eitherbutton pressed. Then, focusing speeds upto max in a five seconds. When the bu onis released, focusing stops. When the button is pressed again, focusing will staagain.

ondary will vary thereby changing the effee ive focal length. In practice, the focallength will change will be small.If you would like to calculate the magnification, use 3000mm as he ocallength of theinstrument. In the event you would Ii e tocalculate the exact effective foc I length,hen refer to the section named How to

C Iculate the Effective Foea Length.F';. ;.:=..... ... ,

.plll ldL iLO- , reJeP: d~ r i

I .11Replacing he battery

4 x UM3 ba eries a used for the powersource. Refer 0 the iIIust anon below.

/ Loe ere

Battery oase/Cover

RBmGVe the loc;k screw and lakeW en the Mewlon is ocused el c 'cally, he out the c OV by P4.111I 1 hook..distance between the primary and the sec- FigJ2-to -


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How to Use the 50.8 [2"] Draw TubeFocuser

The inside diameter of tha draw lUbe is5O.8mmIZ ]. Loosening Ihe locking screwsat the end of the focus draw tube will allowthe 50.8mm(Z ] insert to be removed.Removing this tube opens the end up to50.8mm(Z ] lor USB with 50.8mm[Z )diagonals and oculars.The visual parts ere shown in Ihe diagram.The 0.0. of the sleeve is 5O.8mm[Z ] lindthe diameter 01 the hole in the 5O.8mmIZ']adapter is 43mm. This thread wiU 8CC1lpt theadaptef ring lor the LArge Prism DiegoneLTwin Vue and the coupling S . 5O.8mm[2 1&CCessories and diagonals can be used witheaSB.Loosening the lock ring allO'Ml the diagonalor camera used to be faUlted 360 lor ease01 viewing Of framing an image.

Additionally, the 5O.8mm[Z'ladaptel can berotated bv loosening Ihe locking screwsvery slightlV.... Caution: If the screws afel00sened 100

much the sleeve could filII out.

Photo.,.._ ' , W1th tN ' , . .15

As shown to the right, 50.8mmtz ]accessoriell can be chllnged out with ease.When locus be certlin to use the draw lubeat all bmes to Ichieve COIIrselocus end thenlhe ellH:lfic focull for critical focus. It shouldbe remembered il is beat to keep thesecondary movement to an absolutemiOimum. The MewkJon..300WlIl glVesuperbimagelllD long as the secondery ill movedonly fOf critical locus. If the secondary Ismoved too fer, the imege will deteriorete.The Mewlon300 is en oUlSl8ndingastronomical instrumenl end is never to beused fOf lend viewing.

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Mirror Ventilation Cell And TubeCurrents

Tube CurrentsTube cu rents are present in ewton[an al dCassegrain elescopes. These tube currentsdistort the stellar images causing them toscintillate, blur or distort. Now you muswait until the tube currents go away. Howdo tube currents develop?In winter, the tube is kep i th inside, there-fore when the tube is take 0 side the temperature differentiall between he outsideand inside air will cause severe tube cur-rents because the primary mirror will besubstantially w rmer than th outside airand it will radia e i se upwards. Thesetube cu rents will persist until the mirror andthe outside air ar the same te perature.Th s is cailled temperature equaiza ionwhich is ecessary for stab e high q alityimages

ir Current in the tube of Cass grain eJescopeFig. I6

Air Current In The Cassegrain TelescopeAdditionally, when the tube is taken out, thetube i self is war and urther radia es ndwhen taken in addition to the mirror c rrentscau es a severe degradation of the stellarimages. Therefore i is a good idea to takethe M-300 outside abou an ho r before anobserving session will begin, remove theprima y rear cover, and the two ventslocated must above the prima mirror cell.[This will be discussed presen Iy].

i rWhen compared to a Newtonian telescope.the Cassegrain instrumen of a similar sizewill have a sho er ube and when the baffletube which is a wa rm is ta n in 0 ac-count, he ascending c rrents will cause aswirl around he baffle tube. Until tempera-ure equalization has been achieved, the

stellar images will display these affects.

The airy pillars of lha intra and extra focalimages will show the opposite image ofeach other as shown above.

Fi 18- 12-


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Primary Mirror Ventilation SystemThe Mewlon 300 has been designed 1 in-clude a mirror ventilation IYstem to enablemore rapid temperature equalization of theoptic. This design include. II primarymirror cover and two ide vents. ThesefealUres allow the warm air to exit throughthe front and sides of the Instrument as wellliS the rear of the mirror. Primary Mirror Rear CoverRemove the IlIrge retaining f,om the rellrprimary minor covet and remove it. Becareful not 1 drop the primary cover whenremoving iL Side Ventilation PillteThlSe Iwo venls can be removed byunclamping the latches. These ventilatorsshould not be removed in humid weatherbecause condenl.lJtion elln form on thesurface of the primary.

When the optics have equalized replace theprimary rear cover and the ventilatorcover.

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- Finder A ignmentFinder

Before placing the 11x70 inder into thefinder bracket, place a double layer of clearplastic tape around th finder where he setsof screws will contact t e finder 10 preventthe p im from beng scratched.A finder is a useful too. It permits the precise centering of an object in the field ofview. The 4.2 field of view a'ilowshe ,easycen ering of an 0 jeet to be viewed 0 pographed.

The Takahashi finder uses an interruptedcrosshair which is designed 0 alloweasy cen ering of an objec 0 be photo-graphed or observed. The wide fiel d of thefinder makes the mding of an object easier,there ore, i is importanttha the finder andthe telescoep be in alignment. The follow-ing procedure can be sed to align hefinder.

Alignment Procedure,. P ace a low power eyepiece in the tele-

scope and cen ef b igh star in a convenient pa of the sky. Do not forget toengage he motor drive 0 eep the starcentered. If this procedure is done in day-light, use an object that is at least 0 emile away. Loosen he lock nuts on thetinder bracket nd slight1y move the starto he ce ter of he field using the ad-justing alignment screws.

2 Then use a higt ler magnification eyepieceand repea e procedure by centeringhe object i the leld of view of the telescope and then he finder. Continue thisprocess until the ighes possib e agnifica jon has been used.

Adjusting Screw Procedure1 Turn all the lock nuts until they reach the

head of e alignment screws.

Fig.20

Alignment Screw

Loc Nu

Fig 21

View Field of Finder

View Fiel-


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Co ima ionThe Mewlon-300 is precisely collimatedbefore being shipped. I is possible ha the

M e w l o n ~ could be decollimated duringshipment. In the event of this unlikely situation the following is an explanation of hecollimation procedure. Before proceedingc your local di ributor.

Primary MirTo ColimationThe Mew on 300 uses th Be push/pullscrews to collimate the primary mirror.The mirror can be adjusted using an openend wrench and an A len wrenc

Procedure1 The nut closest to the mirror cell controls

the push screw. See the diagram. Re-member the soc et screw holdS the mir-ror. The mirror can be moved by bac ingoff the socke (pull screw) and then placing the open end wrench over the nutclosest to the mirror cell and turning it.Make certain that the Mewlon-300 is vertical so that gravity will push against themirror cell to rna it move.

2, By urning he pUSh-screw, the p, imiuymir or can be moved back and for .While ooki 9 at the in-au. er imagestighte the pull screw to old the adjustment just made to the primary mirror. Byrepeating this p ocedu s, the primary canbe colJimated.

3. Afte collimating the primary, tighten theloc nuts (those closest to the end of theub ) to jam againstthe head of the push

screw-16 -

Double ActionScrew (Small)

Fi .24Primary ,8 S8 Pia I

O bl. Actin. So, (Small)IPrimary CellI

Lo Nu

Double Ac ion Scr (Lar e)

ock nu w' h a spannerFig,25


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Secondary Mirror COil mationThe secondary mirror can be adjusted byurning the three sets of ,push ~ pull

screws located on 'rh,e secondary older.The illustratqons below indicate the d ection in w ich the imag,e will move n hecollimating telescope."Push" means tig tening ,h,e push screwAFTER loosening the pull screw.II Pull l m en as ig hte rI ing tl e fJu II screwAFTER loosening the push 5cr,ew.

/ P"'hh"".Pus Screw

Loosen these push screws a l it e. Frg.26

*Caution:Do not loosen I he pull screws too much,since ths could cause the 's,aconda y toOOS,en and move, which wo Id totally

decolli te the M-300. Make the' smallestpossible adlustments. Keep in mind he veryong ocal length for the IM-JOD wHii make

e secondary mo,ve w'th the smallest ,ofadju meso It is best to pertor is pro-cedure at night on a s ar with the he,lp of afrie d to make he . ovement5 under yourdirection.

Li:lo.sen this screw a little. Fig.28

Push here.Loosen thjs ScreW a little.Rg.27 Fig.29

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e 5 , , ~ Collimationwith the Coflimating

and the MCOtIdaty mirrorCII l t l l t ovettap,Telescope Then, thtI secondary nWrClf is completelyTheprocedllfl fot...wag .... ..... cc6'n1ted.IICOfM I, discussed below.Thecolim09tingt.l.scope CIIn be used on nrirlCtorl.1 well.. c.negf l inl. Collim.ling the Secondary Mirror

Using theCollimating Scope1. Thesecondf,rymirror eenterdot 10

Id In coIim.tion. Slide thllube 01' thecollill'llllnog scope until thI r.f1ectlOn01'ttHl spldef on!he pumllY mirroris vil-ibIlt. [F Ig.J 11

Tho __ '... __ _ _ . . l IN _2.From his focusing point" If you he tM doo,_foa. tube lightty outward, focvs will bIon !he IOIC:Of'ld.y mirror. eenter dot.[Rg.32)

_ < : : : L ~

3.If the mirror racoIlill'llllldthe second- try mirror" clnllr dOland the center ofT1 HI cent. ' of lI>e eolli-lhecollimatingscope will overlapand crl- ""'OlIO' lookI fuu.,eteconcenu\ccircles.However. if lhe sec

ondery is nOI collimatad lIS shown in Fig.33, then the secondary mirrOf mustbe adjusted

4.In caseshown In Fig.32.1o'l , en the push1Cf_ tAl IOdto n Fig.J3.oo lightenthepush Iet8WStocenter !he centet m.tk.By "lding the focustube of theeoIIimat-jog.cope, whill l checkingthespider andcentet dol's foeus end edjulting eachlerew. find aplace whete thecenter dot

~ t


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Collimating the Primary Using theCollimating Scope

Poinl the tube at a while background.1. Focus Ihe collimating scope on me $pi-

do


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Confirmation of CollimationConfirming oollimatioo using steller Image5 done lifter the optics have been collimatedand in preparation for this test, the InSIlU-ment has been equalized to the ambienttemperature for oyer an hour and the see-ing is good.Choose a bright star jMcond or third magMude)and place it in the center of the fieldYlew Defocus the image and look /It the diffraction I)Inern under high magnification.If the image fOfmed is a seri concentricring evenly spaced with a dark circle in thecenter lIhe shadow of the secondary), thenthe M-300 il collimated. Do this intra andextra focallty. If the rings lire not concentric, then the optaare decollimatltd. Mostlikely a sllghtldjullment of the secondarymirror will be sufficient to collimate the In.IIrument. By pressing the foowsing bunonIN red), the Intra focul can be seen. ByprellBing the focusing bunon OllT white),the elltra focus can be seen. If the opticsare collimated, the concentric rlnga will appear in both views..

The center 01 the diffraction ring la theshadow 0/ the aecondary mirror.

II the MewlonJOO ia not collimated, thenit will not perform to the limit of its capabilities. Defocus the first star observedto confirm collimation.

When the inner tube currents remain, theoptics will appear to be decolimated,

n /OV W I. . . . .

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ObservationII II Visual Observationshe Mewlon-300 is cepable of producing

olltstllnding images of the Moon, planetsand deep sky objects. The instrument muslbe temperature equalized befols seriousobserving can take place. MagnificationThe megnification c.IIn be calculated by us'ing the following formula.

(focallenglh o f telescope)(focal length alan ocular)

Therefore, the shorter the focal length of lheoculars used, the higher the rrntgnificauon,and vise wl ln However. generally themaximum magnification is SOli per inch ofIIperlure lind 1.4) I I the minimum. Theformer is called Ihe effective maximummagnification and Ih.lalle. the effeetiveminimum magnification.Because the Mewlon-300 . focal length is3.572mm, the magnification produced byusing the LE30 ocula. is 119.7,.. Therefore.It is lIppro imalely 119) .

Lunar ObservingThe Moon is an ideal object to observe torthe beginner and well as the advancedobserver. When observing the lunar disc amagnification 01 about 50ll will place thelunar disc:: in the field of view. The TskahuhiLE-50 oc:ular is recommended lor this use.Furthermore; when the Moon is full or closeto full, Ihe view mav be too bright, 0 it isadvisable to use such fille,. n : ND-96, 58Green or a 3N5. All of these fitters will reduce Ihe bfightne. . end inereese the con

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uast.The lunar lurtace .hOWl e wealth of detail,uch e creters, mountains, rilles, valleys.rey sUueture and crater leI,. When observing with the Mewlon300, it is best to ob-serve along the terminator to increase theconttllst between the dark end lighlfeaNrltS.The filters mentioned previouslywill also enhance the contruland detail observed.The Mewlon-300 Is limiled bV Ihe seeingconditions. In those moments of good seeing the MewlonJOO will produce difffaetionlimited images.

Planetary ObservingPlanetary observations are besl when theelmosphere is steedv. When Ihe Slllrs l Ihelenith twinkle very little o. even filter not alall, the best planetary observalions can bemade.The best observing t hfllque 10 use Is 10sit in e comforteble chair in order to observeIhe pleneu for en eXlended period of lime,Ihis will enable Ihe observer to relax andtake edvantlge of those rite moments whenthe image pops in 10 sharp locus becausethere is a steady column Of air eelland theimage popllnto sherp locus.These are Ihe times when high magnification can be used. AI other times, use lowermagnification. Low magnification is usedwhen the imege of the planet is no longersharp. Then magnification should bereduced until the image becomes sharponce more.21


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ImagingDeep Sky Observing

When observing galaxies and clusters.primarily use lower magnification. Whenobserving small glo ula star clusters orgalaxies with small apparent diameters, usea higt magnifica ion. Especially where Iigpollution is a problem, use higher magnffication to diffuse the light in the backgroundand darken it fol' better seeing.

The Mewlon-300 coupled with the option Ireducer/flattener to f/9 1 for deep spaceimaging. The large image scale will makethe imaging of small galaxies and glo ularclusters possible. is a absolute necessity that a highly accurate stable equa orialthe mount is used such as: the TakahashiNJP and EM-500. In bo h cases the mountshave a low period"c error and an auto gu derinpu tha will allow an au 0 guider to beused to the mount during long exposu as.

Prime Focus Imaging1. Prime Focus: P ime focus imaging is

possible. The long focal length and highf-ra 0 ma es the use of an auto guidernecessary 0 make images. The au 0g ider enabJes the imager to ma e longexposures of small objects with a GDor digital SLR On the other hand, making prime focus images of the Moon isrelatively simple.

he 3500 ' m focal Ie gth is equ'valenta 66x view of the Moon hrough andoClJla . Since the Moon is so bright, bracke ing exposures will produce excellentimages of the Moon.

2. Reducer/FI ena: he Mewlon 300 isdesigned 0 be used wit e optional fl9.1 reducerlflattener. se ofthe re u erlflattener will reduce exposure times by2/3rds when compared with prime oeusand i will produce flat field images ofdeep space objec s

is is an ideal imaging platform for adigital SLR or CCD camera.

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3. Pror,ection Photography: The Mewlon300 ea be used 0 make high magnifica-i I n ima ges. of the Moo and planets

when used with the optional TCA-4 pjection imaging unft Au ique feature oft ,is uni allows the magnification to bevaried with e'8e ocular used. The magnificatio fa nge will de pend pan thefoea ~ n g t n of the ocular used.

4. Imaging: e Mewlon-300 ca be sedw th a CGD camera, dIgital SLR 0 35, mfilm camera.Wide mount -adapters are available' ormos brands 0 digi al a d 35mm SLR's.Please state the brand when erda i g thisproduc.

Opt ona 1 Photographic AccessoriesTCA-4 Eye ieee Projection Device]

T e TCA4 is designed to produce highmagnifica io,n images of the Moon Bindplanets .sing eyepiec-e projection. The unitis easily and ra pidly a11ached to the telescope. The draw tube allows the Imager tovary the magnification wi h each eyepieceused to achieve the desired Image scale orthe lunar surface or plane imaged.

Flattenered ucer-his redllcerlflanel1er is specia11y desig edfor heM ewlon to correct for th e coma andfield curvatlilre 0 p oduce a flat field image.Th's eorrecto can be used to i age smallgalaxies and clusters, as wei as smaH planetary nebulae.Opfcal Specificationsfocal length w/reducerfoca1 atio w/redueerImage circlePhotograp Ie 'eld

2739m1;9.1 36mm0.8

W en the f o l ~ reducer 's used w th theMewlo -300, nloc: the ring clamp and pullQU' the focus ube 16mm, as shown andfocus can be done by a slight move ant oft e secondary minor.

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Accessories for Photo!Visual Application

31.7mm[1.25") CompressionRing Diagonal

The Takahsh' compression ring 31.7mm[1.25'1 diagonal is 8 high quality diagonalequipped with a compression ring ocularadapter thaI insures Ihat the opticalaKes ofIhe ocular end instrument are coincidentalfor maximum performance Ihal producesan extremely sharp, high contrasl image.Reier 1 Rg.J8.

31.1 Pri.... ........

50.8mm[2"] Takahshi 1110thWave Mirror Diagonal

The SO.6mm[2 ]1I1Oth wave Takahashi mirror diagonal is a very high quality SO.8mm[1 ) end 31.7mm[1.2S ] diagonal that can beused with the wide field Takahashi LE50ocular. II provides sharp, high conlrastlliews. Reier to Fig.39.

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Twin Viewer BinocularThe Twin Vue is a 45 binocular viewer.The ocular adapters U II the Takahshi compression ring to insure coincidence o theopticalllJles o the oculars and Mewlon 300.Refer to Fog.411.

50.8 v

5 Turret Ocular HolderThis turret ocular holder was designed tobe 8 convenient way for an obselVef to usefive diffefent ocular that will produce thatmany diffe.ent megnifications fo. env ob-.elVing. Each ocular holder is a compres-,ion ring 31.7mmll.2S ] holder. Refer toFogAl.

.......

2S-


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T-Mount & Wide T-MountThe T.Mount is used to connect to the TCA4 eyepiece projection IIdllpter for high , TCA-(magnification photos lind CCo imllges of

. Pnme Focus Rinathe Moon and planets. Refer to Fig. 42._ Oi UlSlR

The Wide TMount can be used for prime FiI-(2focus, reducer, 35-flattener photography.Refer to Fig. 43.

F,.. 43

TCA-4This varioble eyepiece device allacheseosily to the Mewlon-300 to produce highquality lunar and planetary images. It cenbe used with 0 CCO camero, digital SlR asshown below.

TCA-4J 300 V ouaI Baclo.

-,R ~ l R e d o J e l Dilital SlR

50.8 SIH\o.

=- 26 ~


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TSC Camera Adapter 42fl='O.75 hreadiriAn adap e ring for a digital SLR photography with the Mewlon-300. Please refer tohe section on Photography. This used a

standard T-ring to attach to the TS primefocus camera adaputer. Refer to Fig. 45.Telescope Parts. 43 P=O.75r 43mm Pitch O.75mm screw fig. 5

Mewlon Reduce I latteneThe Mewlon-300 reducer/flattener reducesthe Mewlon-300 to ff9.1, corrects for co aand produces a latfie ld. leas e refer 0 thesection on Imaging . An optional wide mountT-adapter will ttach directly to the reducer/flattener. Refer 0 Fig. 46.

Attaching to the Mewlo 350.8 dap FR(FlattenerIReducer)

e:::::-l Wide T-mount Digital SLR

I J -300 VIsual Back

Rg,46

CoUim ng ScopeThis scope is used to col ;mate the w l o n ~ 300 or a ef actor. The bUilt in magnifierenlarges the cen er dot on the secondaryfor easier collimation.

- I hu

Coupl[ng Head Fig,47M36.4 =1.0 Threading- 21-


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It is possible lhat after mllny YllalS 01 usethe primary mirrOi 1 the Mewton-3Oll mayneed cleaning. Before llttempling thl, process. contact your local dealer.1. Remove all of the visuailldapters; reo

move the cell clllmp ring alld the primarymirror cell cover. Next remove he sideventilation plate 8S shown.

2. Place a clean piece of peper on II hardlind flat surface. Pullhe lube with therear cell down on to the paper on theflat surface. [In this caca, flat means really flat with no tilt whatsoever to it. Thiswill prevent the lube from falting over on1 the ground or on to youll. With 8wrench, loosen the sil Bmm cap bolt,which connects the lube and the pl'imarymirror cell.

lib = = = = = c = a - : r e : : : - - : : . . : a : l n : ~ : : : n a = n = c = e = = = = = 1 1\ e.t cap L.oelo. RiI

3. C refully lift the lube off of the mountingring while being careful not 1 hillO theprimery mirror baffle. At thi, time. makelure thlll the tube hal been lifted completEtly aballEt and Iway from the baffletube.

SvNd _ or _ .11_._ to tho bod< dirty.- 28-


29/31

When you are p eparing to disassemblethe Mewlo 300 in order 0 clean the primary mirror please contact your local disributo before attempting to do 50.

Replace the front cover and rear ocul rplug after use to help prevent dust fromen ering the into the optical system.When the Mewlon 300 is broug in 0 awarm environment from a cold one. dewcould form on the primary mirror. If thisoccurs do not replace the end covers.Use a hair dryer on the low I eat setting toremove the dew from he primary.This same hair dryer can used duringa session under t e sky to emove anydew that may form on the primary. Thelong length of the Mewton-300 tube helpskeep dew away on most nights. Using ahair dryer here will help preve. t spotsfrom forming on the mirror surface because the dew has d ed.Under no circumsances should theMewlon-300 be closed p while there isdew on the surface of he primary or secondary mirrors.The outside of the tube may be cleanedwith auto wax.t is highly unlike but possible that dew

co ld arm on he surface of the secondary but i does not hurt to check 0 bee in.

Main ube

Remove the m [1 1 tube slowlynot to touch the baffle.

Blowout e dusts andparlJcles by a blower.pFig.50

- 29-


30/31

System Chart

13.50.812 111_ [KPOO113]14. Coupling -S IKPOQ103)18. ~ o n Reduce,/flMteflll'26. Quintuple turret oculi. holder

~ [ } .

tKA705811IKAOO4{)ll

30 TSC camera adapter [KAOO206132. T.Mount [KAOO221J - 00226133. Wide TMountiKA00230 - 002J6]34. DigiUlVlilm SLR36. TCA . . lKAOO210]46. 31.1[1.251 oeuler ada.pter[KAOO101147. 31.711.25 J O


31/31

Symptom Check RemedyI' In. Ironi remov&d1 Rema th Ironl t ip .Is lhe ocu,-, in place? You Clnnnol lee .n'(tlling without

n ocular. in pIKe.Nothing ean be seen. Dew on 1M mirror Or on the

ocular?Dry the dew before vieWing.Do no uy i l l " " " " " yo. . in I high humidity e

Th.e finder Illgrwldl Align the fioollr.Imag focused? FocUi image.

No foeusAle the baneries in lhe hendconlrollef out of power?

Replace new batte,iu.

II the wirll of the hindconloroller disconn CIed7

Connect the wire Iem..".

lmll{lll is fuzzy.Dewan Ihe mirror or on theocula,]

Gel rid of .:lew by blowing Ii'

Are the vilull parts Connected CDuletly1

Conn&Cllhem correctto,'.

Did you edept the mirrOrSer.ough to the outside i,?

Adapt thII mi,roe well enouo;lh 1 theoutside elf.

Im"llll is delo'med. you. '''1nc:09'' coIIimetedl Chack col1imltion Ind collimate WI\lIcesS

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Mewlon300 Manual