Takahashi CCA-250, Instruction Manual

Page 1: ... orrected assegrain AstrograPh G INSTRUCT10N MANUAL KAHASHl ...

Page 2: ... llTlediately O vvhen you atthch the tube assembly onto a rnount do it very carefu y so as not to drop it lt could cause iniury Do notlay the tube assembly on any surface thatis not completely level and sufficiently large to hold the CCA 250 An uneven surface could cause the in strument to fa off on to the ground Do not place the tube assembly in the sunny place 丁 he direct sunlight wi heat up the...

Page 3: ...口 3 Specifications 口 4 Accessorles 口 5 Tubeノヘ SSembly Layout Ⅲ 6 0ptical systen features 口 0 口 7 1nstaHation ロ ロ 口 8 14 Photo visual application 0日 15 18 Systern parts 3 口 ロ ロ 0 19 23 CoHimation ヨ 口 口 口 24 28 Care l aintenance 29 30 Systerrl Chart 口 口 31 33 3 ...

Page 4: ...dia With Extender CR l 5X Effective focallength 1880mln Effective focal ratio 7 5 1mage circle φ 40mm With 645 Reducer CA O日 72X Effective focallength 890rTlrn Effective focal ratio 3 6 1mage circle φ 60mm dia Outer diameter of main tube 306 lrn Totallength oftube assy 870 l rTl Total weight oftube assy 22 8kg 50 7 1bsl inCluding 7x50 findeL dovetail adapter Finder7x50 apparent field of 4口 2 lrv r...

Page 5: ...ection certificate nspection certiflcate 7X50mm Finder bracket not for u s market tools instruct on manual dove tail saddle INote ln orderto use the auto focus function an ASCOM compliant software disc USB cable AC adapterfor DC12V l 5A polarity center tt plus are required 躙 嘲 E コ ロ 5 ...

Page 6: ...ttube CarbOn F ber Finder Scope Dove 丁 all P mary Mirror Cell Stud for Attaching Finder Correcter Lens Cell Cap Focuser Drive Unit Focuser Drive Unit P mary Mirror Cell BOttom Ring Screw Spider Spider Ring p Ring Clamp一 判 8 IIIIIEIIゴ III 一 一 一 Dove 丁ail Adapter Secondary Mirror Bafne Focuser Motor Un t Dove 丁ail S 6 Dove 丁 ai Adapter Bridge Spider Attusting Secondary Col maJon Screws 3 in a set ...

Page 7: ... using the dedicated reducers and extender 丁 he CCメ い 250 can be used at the native f 5 f 3口 6 1rvith the Reducer CR O 73X and f 7 5 with the Extender CR l 5X which have been developed for the Takahashi s original Mewlon CR optical systems Moreoveら in order to cover the largerirnage circle of future CCDs a dedi cated 645 Reducer CA which produces 60mrn circle with less than 10 rnicron irn ageis no...

Page 8: ...th equal space between the adiuslng screws and lock the lnder scope with adius ng screws Again attach the i unlinator in place Dove Tail and Bridge Do notremove the dove tail or the bridge 丁 hese parts are rrlade of alun nun and the main tube is made of carbon fibere So these are assembled by a special method to off set different expansion rates and contrac tion ofthese various rrlaterials Usua y ...

Page 9: ...d damage to the adapters Allen W鰤 市 Dove tail Adapter Holder Base Dove tail Handle 2ロ Allen Wtth 斜 1月14daJ Spring Washer一 Plate Bracket 3ロ Plate Metal Allen Wrench Bridge 1ヽ 丁op Ring Dove 丁 all Plate Metal Plate Metal Placing the tube assembly onto the Mount To place the tube assembiy onto the rnount the dove tail saddle plate is used 丁 his al lowsthe tube assembly to be taken on and offthe rnount...

Page 10: ...vingロ ing away and striking the rnount ITlake the OTA horizontalロ 3 Holding the scope with on hand loosen the saddle plate clamps slightly vvith the other hand which a ows the tube to be moved back and forth 4 lfthe instrumentis not balanced loosen the Dove tail handle and s ide the tube as sembiy forward and backward untilitis balanced Balancing the R A Axis laVVhen balancing in the Declination i...

Page 11: ...ect attachment vvi not a ow maxilnurTl perfor mance and lrvill not focus correctly and it wi reduce the perforrnance ofthe scopeロ Camera Angle Adiuster cAA 丁 he CAA is attached to the tube to a ow the irnaging package to be rotated 360 Loosen thelock screw and then turn the CAA to any desired position When the CAA is used rotate the entire camera to keep the T ring from conling loose Check the foc...

Page 12: ...eSSed the dis tance bet een the primary and the second ary is Ⅵ パ dened and the focal plane willrnove inward い hen FOCUS lminuS iS pressed FOCUS Switch black Widens the distance between the primary and the Secondary FOCUS Switch red Narrows the distance between the primary and the Secondary the distance between the primary and the secondary is narrowed and the focal plane wi move out ard Each FOCU...

Page 13: ...vv se viewing the obiect 3 VVhen itis focused best tighten the lock r ng Finder Attusting Screw Finder Reticle I uminator Finder Adiustment l Attach a loⅥ ノ pOwer ocular to the visual back and center a conspicuous DbieCt 10由 cated far away View 2 Change the eyepiece Ⅳ ith high power one and centerthe obieCt again 3 lfthe obieCtiS Seen different as shown in the illustration adiuStthe finder scope s...

Page 14: ...rosshair in the accept the i uttlinates finder and makes the centettng obieCtSin the ewtteld easier 丁 he i urninator is inserted into the hole covered by the slotted screw nextto the eyepiece end ofthe finder scopea lf you wish to turn the iHunlinator on turn the chrome knob ciocklrvise 丁 he Knob Ⅳ ill click when itis turned on 丁 his Ⅳ ill a ow the i urninator to be changed to suit the sky conditi...

Page 15: ...ent temperature Astro maging atthe Prime Focus 丁 hisis the ilnaging method placing the CCD atthe prime focus plane ofthe CCA 250 丁 he focal ength of a telescope at prime focusis 1250 1rvhich needs a high quality autoguider to keep the steHarirnages perfectly focused A CCD calmera or35mn DSLR can be used to rnake images I Back Focus 丁he back focus of this instrument is 155 4爾lln from the CAA and 19...

Page 16: ...ter controlled focusing An ASCOM download is available on the Takahashi Ja pan website as we a Takahshi America webske When an obiectiS Setto beimaged connect your PC vvith your CCA 250 and focus by using an ASCOM compliant soft ware focusing sottare available Forfurther details refer to the instruction lTlanual at tached with the software thatis used Power Source 丁oa PC 16 ...

Page 17: ...1nlTlfilter can be attached on the CA 35 50 8mm 2 or on the Mount DX WR 丁 he filter vvith large attaching frame can not be attached on these accessories because of sma spaces An 82 lln filter can be attached on the corrector ceH Mirror Cell Filter A58nlrn filter can Reducer CR O 73X be attached on the 58nlrn Filter Reducer CR O 73X 48mm 丁 Mount DX WR Pttmary Corrector Cell 50 8mm 2 Filter 17 ...

Page 18: ...ystena chart very carefu y and attach yourimaging pact age strictly according to the back focus Tube Current When the CCA 250 is taken out there will be air currents inside the tube that vvi dis tortimagingo Soritis necessary to Ⅳ ait until the temperature inside and outside the tube is equal口 When the telescope is brought outsiderthe temperature inside the tube Ⅳ ill be higherthan the outside air...

Page 19: ...anding images Reducer CR O 73X Reducer CR O 73X changes the focallength to 910mm f 3 6 lmaging with a DSLR needs the foHowing accessories as i us trated Camera An e A uster CAA RD EXtt R ng Specs Focallength Focal ratio lrnage circle 910mm f 3 6 38mm Reducer CR O 73X 丁 Mount DX WR DSLR Coupling 丁 W Reducel CRO 73X RD EX丁 19 Coupling 丁 W ...

Page 20: ...e used with large chip CCD cameras and fu frarrle 35nlm DSLR so as illustrated belowロ Specs Focallength Focal ratio lrnage circle Coupling 丁W 890rnrrl f 3 6 60mm 丁 Mount DX WR DSLR A ust ReducerCA O 72X AUX Ring Camera Angle CAA 645 Reducer CA O 72X AUX Ring Camera Angle A uster CAA 20 Coupling 丁 W ...

Page 21: ... smaH apparent diameterse ln orderto attach an imaging package h o methods are available atandard lⅥ ethod Heavy Duty Mlethodロ O Standard lⅥ ethod RD EXtt Ring Extender CRl 5X CA 35 50 8 丁 Mount DX WR Specs Focallength Focal ratio lrnage circle 1 880rnrn f 7 5 40mm DSLR Camem Angle Attuster CAA 175 5mm RD EXtt Ring Camera An e Aduster CAA Extender CRl 5X 21 ...

Page 22: ...Camera An e A uster CAA Screw the locking screws to the end Extender CRl 5X Extendel CRl 5X RD EXtt Ring 丁一 Mount DX WR EXtt aux Ring Aux Ring x 2 0oupl ng 丁 W 175 5mm DSLR Aux R ng cOupling 丁 W Camera An e Attuster CAA EXtt aux Ring 22 ...

Page 23: ...Extender CR l 5X or 645 Reducer CA O 72 VVide Tttrnounts are available for EOS and Nikon CA 35 50 8 丁 一 Mount DX WR DSLR Attaching a CCD calmera DSLR s and CCD cameras can be attached with either a T mount orthreaded adapters ln either case these rnethods insure a firm connection and lrvhich Ⅳ ill maintain the cor rect rnetal back distance and produce the best possible images R Cautions 丁he camera...

Page 24: ...circular rnark s stenc ed atthe center of the secondary rnirron lf the rnark is shifted coHirnation is necessary 1 Attach the coHilnating telescope as iHus trated 2 Focus the secondary looking into the coト lirnating scope Refer to the fig 3 丁 he fig 4 shows the optical axis is coHirnatedE As shown in the fig 5 ifthe lnark and the re flected image ofthe coHirnating scope are not seen as concentric ...

Page 25: ...s on the side of the top ring Loosen 3 spiderlock screws M5with hex agonal hole located on the opposite side of the coHilTlation iock screws until it Ⅳ ill not be tighten hen coHirnation is per fOrFned口 Refer to the fig 7 Spider ring locking screws 3 posit ons Col mating posttons Secondary coHirnation pulling screws 6 positions Secondary collimaゼ on pulling screws 3 posLions Spider lock screw Spid...

Page 26: ... in the co irnating scope INote l Repeating this procedure lrvill make the rrlark and the reflection image ofthe co irnating scope seen neariy concentric but one vvay adiuStment will make the distance between the pr mary and the secondary ider than that of designed value 丁 his will make the instrument iess capability than origina y designed 丁 herefore adiustlTlent should be so rnade that the dista...

Page 27: ...n wrench 3 sets of the lock screws which lock the optical axis ofthe primaryo Referto the Fig口 9 4 Center a 2nd lnagnitude starin the field 丁 hen slightly defocus the star using buttons on the drive unit and see the intra and ultra focal star mages lfthe images are seen not concentric as shown in the Fig 10 adiuSt it So that the pattern be comes concentric as shown in the F g 11 丁he diffraction pa...

Page 28: ...Ⅳ ise the whole prilTlary would go down by its gravity and off centen Shifting direction of the optical axis 丁ighten Loosen INote 5 ln the process of co rnating a star at the center of the field will go off centen tthere fore keep the star centered by using the mount INote 6 A pair ofthe pushing screws atthe both side ofthe puHing screw should be tightened evenly INote 7 Adius ng the pttmary is ve...

Page 29: ...ched with M3x6 screw 4 pcs SO Re move the lby a 十driven 5 wires are con nected to the Drive Unit Out ofthese de tach carefu y the ones connected to CN6 Motorand CN81nner Temp Censen 3 Push in the detached ires in the hole appeared bet Ⅳeen the primary and the primary ceH afterthe Drive lJnit has been removed 丁hen lockthe Drive Unit on the primary ceH again 4口 丁 he primary ceH is attached on the bo...

Page 30: ...he 4Π l nA en vvrench 10 Remove the Drive Unit and insert unat tached 2 wiresGtthen lock the unit firrnly with the 4 screws 11 Fina y attach the visual back How to detach the connector When the male connectoris detached from the female one hold the arrowed part and pu it out as i ustrated s Female COnneCtOr Cleaning the Corrector Lens 丁 he correctorlens insta ed in the primary mirror section wi no...

Page 31: ...KP83002 18S Reducer CR O 73X 丁KA82580 18L 645 reducer CAO 72X 丁 KA86580L 33 Wide丁 mount DX WR EOS 丁 KA01251 Wide丁 mount DX WR Nikon 丁KA01255 34 DSLR camera Canon EOS Nlkon 46 31 7 11 4 Ocular adapter 丁 KP00101 47 LE oculars 丁 KA00520 丁 KA00528 49 Diagonal p sm 31 7 11 4ワ 丁 KA00541 60 Extender CRl 5X 丁 KA82595 81 RD EXtt coupling 丁 KA86205 86 CCD 31 ...

Page 32: ... Aux ring PF 丁 KP83002 18S Reducer CR O 73X TKA82580 18L 645 reducer CAO 72X 丁 KA86580L 645 Reducer CA System Chart 33 Wide丁 mount DX WR EOS 丁KA01251 W de丁 mount DX WR Nlkon 丁KA01255 34 DSLR camera Canon EOS Nikon 46 31 7 11 4 Ocular adapter 丁 KP00101 47 LE oculars 丁 KA00520 丁 KA00528 81 RD EXtt coupling 丁 KA86205 86 CCD 32 ...

Page 33: ... Ocular adapter 丁 KP00101 33 Wide丁 mount DX WR EOS 丁KA01251 Wide丁 mount DX WR Nikon 丁 KA01255 34 DSLR camera Canon EOS Nikon 35 CA 35 50 8 丁 KA31201 47 LE oculars 丁 KA00520 丁 KA00528 48 LE 50mm ocular 丁KA00530 60 Extender CRl 5X 丁KA82595 74 Diagonal mirror 50 8 2 丁 KA00543 75 Adapter DM 丁 KA00111 81 RD EXtt coupling 丁 KA86205 82 Aux ng EX丁 丁 KA86596 86 CCD 33 ...

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Page 36: ...丁AKAHASHI SEISAKUSHO Ltdロ 41 7 1Э haracyo ltabashi Tokyo 174 0061 APAN PHONE 81 3 3966 9491 FAX 81 3 3966 9524 ...