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Telecompressor Alan Gee II (Shapley-Lens F/5,9) Manual

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Telecompressor Alan Gee II (Shapley-Lens F/5,9) Manual TelecompressorTelekompressor Alan Alan Gee Gee II II (Shapley-lens(Shapley-Linse f/5,9) f/5,9) EspeciallyBesonders suited geeignet for use fürwith die CCD Anw camerasendung mit Baader andBinokularen Baader binoviewers Ansätzen und CCD-Kameras! Manual Anleitung Spacer Flanged Spacer Tube Spacer Tube Lens Cell Fig. 1) Ring Endring Spacer Flanged Spacer Tube Spacer Tube Lens Cell Ring Endring Fig.1) The desire for „two telescopes in one“ is old, but due to the laws of optics, all approaches to it must be a compro- mise. A telecompressor should illuminate the 24x36mm picture format as well as possible (= to minimize vignetting), andDer Wit unschshould nach avoid “zw eiimageTelesk distortionopen in Einem” – especiallyist alt, und the alle inevitable Annäherungen astigmatism. daran sind You wegen should der Gesetz also bee der able Optik to useein K itompromiß. with ac- cessoriesSo soll ein Tlikeelek ompressorstar diagonals das Kleinbildf or binoviewersormat 24x36 which möglichst have gut a long ausleuchten optical (=path. geringe TheVignettier standardung) compressors und Bildfehler of - v theor allem major den unvermeidlichen Astigmatismus - klein halten, Gefordert ist zusätzlich, daß okularseitiges Zubehör mit größeren optischen Weglängen, manufacturerswie Zenitprismen areund designed Binokulare forverw a ratherendet w shorterden distancekönnen. Die to Standard-Kthe sensor/filmompressoren and areder gnotroßen suitable Hersteller for sinduse fürwith deutlich binoview ger-in- ers.geren Abstand zur Filmbühne gerechnet und eignen sich nicht für die Verwendung mit Binokularen Ansätzen. YouDer Alancan Geereconfigure II Telekompressor the Alan er möglichtGee II telecompressor durch seine Konstr to uktion,adapt itdas to Linsensystemdifferent optical an das accessories. jeweilige Zubehör For photographic anzupassen. Dazu application,ist es zum Teil you erforder maylich, have wie to bei insert der f otogthe rmulti-coatedaphischen Anw achromaticendung, den lensesmultivergüteten into the Achromaten baffle tube in dasof the Blendrohr telescope, des Forer nrohrs– for theeinzuführen, visual use oder with - wie a binoviewerbei der visuellen – mount Verwendung the lens an carrier den Binokularen together -with den theLinsentr lensäger holder zusammen immediately mit dem in Linsenhalter front of the unmit - telbar vor der Eintrittsöffnung eines Binokulars zu montieren. entranceDie mechanische aperture Konstr of uktiona binoviewer. berücksichtigt die Bedingung, die Hauptspiegelbohrung mit dem Blendrohr maximal zu nutzen - aber die TheOptik construction sicher zu halten. takesTrotz two der conditions daraus resultierenden into account: dünnen To Wmakeandstär maximumken werden use die of einz theelnen baffle‘s Hülsen diameter, durch Feinstge and towinde keep sicher the lockverbunden. secure. Despite the resulting thin housing, the individual tubes are securely connected by fine threads. Die nach den Empfehlungen von Alan Gee von Roland Christen speziell für Schmidt-Cassegrain Teleskope neu gerechnete Optik, ein The2-Linser optics mit wereLuftabstand, designed mit specificallygeebnetem Bildf for eldSchmidt-Cassegrain hat eine Brennweite telescopes von 259mm accordingund sollte tonach the der recommendations Theorie - um den ofbesten Alan GeeKorrekturg and Rolandrad zu erreichen Christen. - maximal The two in air-spaced seiner halben lenses Brennw haveeite av orfocal dem length Brennpunkt of 259mm des Okulars and a oder flat derfield. Bildebene To achieve der Kamer the a bestpositionier correction,t werden. theyDen should idealen beBildabstand placed – v accordingon der kamer toaseitigen theory –Linsenfläche at no more bis than zum half Brennpunkt of that focal (Feldb lengthlende /away Filmb ühnefrom othe.ä.) focalgibt Chr pointisten of mit the 121mm eyepiece an. Die or einzthe elnenimage Hülsen plane w oferden the camera.deshalb je The nach ideal verw distanceendetem Zubehörbetween anders the camera-side kombiniert (oder lens zum and T eil theauch focal weggelassen). point (field stop / camera sensor etc.) is 121mm, according to Roland Christen. Because of this, there are different combinations of the spacer tubes for each use. Berechnung des Kompressionsfaktors M Calculationnach Michael of Co thevington, compression-factor Astrophotography f orM the Amateur. accordingTelekompressor to Michael Brennw Covington:eite F2 = 259mm Astrophotography for the Amateur. Standardauflagemaß für KB-Kameras (alle): 55mm Telecompressor focal length F2 = 259mm FlangeAbstand focal Hinter distancelinse Telek forompressor DSLR-cameras / T-Ring with - mit T2-adapter 16mm T-Adapter (all manufacturers): und allen Verlänger 55mmungshülsen gemäß Abb.2: 66mm Daraus ergibt sich der Abstand Hinterlinse Kompressor / Filmbühne Kamera zu S2 = 121mm. Distance between rear lens of the telecompressor and T-ring – with T-adapter and all spacer tubes according to Fig.2: 66mm Der (negative) Verlängerungsfaktor M = (S2-F2)/F2 = (121-259)/259 = 0.533 This results in a distance S of 121mm between the rear lens of the compressor and the camera sensor. Für die weiteren Berechnungen2 kann das Minuszeichen ignoriert werden. The (negative) elongation factor M is calculated as follows: M = (S -F ) / F = (121-259) / 259 = 0,533 Fokussiert man mit eingesetztem Telekompressor, muss der Brennpunkt2 des2 T2eleskops relativ weit nach außen verlegt werden: Theum minusS1 = S2/M sign =can 121/0.533 be ignored = 227mm. for theDiesen furtherW calculations.ert addiert zur Teleskopbrennweite z.B. vom Celestron 8 = 2030mm, ergibt nähe- Ifr ungsyou wfocuseise 2257mmwith the effinsertedektive Brennwtelecompressor,eite und eine the eff focusektive of Öffn theungszahl telescope von must 2257/203 be moved = 11.1 relatively für das C8 far ohne to the Telek outside,ompressor by the. distanceMit dem TSelek. Theompressor calcalutaion ergibt is:sich S dann = S die/ M eff = ektiv121e / Lichtstär0.533 = k227mm.e M eff = This 11.1 value x 0.533 is added= 5.9 (= to Blende the focal, Öffn lengthungszahl). of theDieser tele-Wert stimmt gut 1mit dem am C8 direkt gemessenen1 2 Wert überein. scope. A Celestron 8 with f=2030mm for example 2will have a resulting effective focal length of 2257mm. This would mean anDie effectiveVerkürzung f-stop der ofBelichtungsz 2257/203 eit= 11.1ergibt for sich the aus C8 M without= 0.35, telecompressor. d.h. auf ca. 1/3. With the telecompressor, it has got an effective f-stop M = 11.1 x 0.533 = 5.9 (= focal ratio). This value agrees well with the values measured directly at the C8. eff - 1 - The shortening of the exposure time results from M2 = 0.35, that is about 1/3. 1. Visual Use with a 1,25" Star Diagonal 1. Visuelle Verwendung mit einem Zenitprisma 1.11.1 StecInsertken the Sie telecompressor den Telekompressor without (ohne the V seconderlänger extensionungshülse tube2) in vcompletelyoller Länge into bis zumthe C8 Anschlag baffle intube das C8 Blend- 1.2 rohrInsert hinein. the white plastic spacer ring into the filter notch at the telescope‘s adapter thread 1.31.2 LegenAttach Sie the den visual weissen back K atunststoffr the telescope,ing in die as Filter usualnut am Teleskop-Anschlußgewinde. 1.3. Nun wird der Original-Okularstutzen mit der 2" Überwurfmutter am Anschlußgewinde befestigt. 1.4 Insert the star diagonal into the visual back and secure it with the locking screw 1.4 Schieben Sie das Zenitprisma bis zum Anschlag in den Okularstutzen und sichern m. d. Klemmschraube. 1.51.5 JedesNow beliebige you can use anyOkular 1,25" kann eyepiece, nun in das as Zenitprusual isma eingesetzt werden. 2.2. VisualVisuelle UseVerwendung with the am 2" 2"Maxbright Maxbright UniversalUniversal-Zenitspieg Star Diagonalel 2"2" Eyepiece Eyepiece 1,25"1,25" Eyepiece Eyepiece Standard-position of field stop – 1,25" Eyepiece 2"2" – – 1,25" 1,25" Standard-position of field stop – 2" Eyepiece reducerreducer T T T-2(i) T-2(a) -2(i) -2(a) IfI fyou you use use 1,25" 1,25" eyepieces, eyepieces, yyouou should removeremove the spacerspacer tubestubes to to achieve achieve the the perfect perfec tfocus focus point. point. ExtensionExtension ring ring T-2/2"T-2/2" ShortShor tC8 C8 T-adapter T-adapter forfor everyevery 2" 2" SC-adapter SC-adapter threadthread 2"2" Maxbright Maxbrigh®t® universalUniversal star star AGAG II II diagonaldiagonal 3,3"3,3" nut nut for for C11/C14 C11/C14 (and(and Meade) Meade) If Iyouf you use use 2" 2" eyepieces, eyepieces , youyou should should use use both both distancedistanc tubese tubes to t achieveo achiev e thethe perfect perfe cfocust focus point. point. 2"2" / T2/ T-2 adap adapterter and 2"2" DDeluxeeluxe eyepiece holder and 2" filter holder eyepiece holder Fig. 3)Fig.3) ((forfor all SCs) In IncombinationVerbindung mit with einem a Baader Baader 2“2" ClickLockMaxbright-Zenitspiegel star diagonal, kann youder Alancan mountGee II T elekthe ompressorAlan Gee direktII Telecompressor vor dem Spiegelgehäuse directly in zwi - frontschen of einemthe mirror T-Adapter between(#21) aund T-adapter einem Reduzierr (#21) anding (#28)a reducer festgeklemmt ring (#28). werden. For Beimirrors anderen by otherFabrikaten manufacturers, ist es evtl. notw youendig, may den haveKompressor to mount unter the V erAlanlust Geean Gesichtsf II closereld towards im Blendrohr the desbaffle Telesk ofopes the telescope,zu befestigen. which- Die maximalemay reduce Okular-Brennw the fieldeite of view.beträgt 40mm.Do not use eyepieces with a focal length of more than 40mm. - 2 - #16 #26 #28 You may have to remove these two spacer tubes to bring the lenses of the Alan Gee to the perfect position. To achieve
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