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I have been using the Dados Spectrograph since 2012. It is an amazing device that allows even with amateur instrumentation to reveal incredible information from the light coming to us from celestial objects. I currently use the Dados with a 1200 l / mm grating, and I have equipped the spectrograph with a special home made calibration neon lamp located between the Dados and the telescope. This allows accurate non-linear calibration even at 0.25 Angstrom / pixel dispersion. Thanks to that, this great spectrograph helped me to measure not only the radial velocities of stars, but also the rotational velocities of gaseous plasmatic disks around Be stars.
Ich habe im Herbst 2017 das Spektroskopie-Seminar am Carl Fuhlrott Gymnasium in Wuppertal besucht und dort die erste Berührung mit dem DADOS gehabt.
Zum einen ist es der hervorragenden Schulung durch die Referenten, zum anderen der durchdachten Bauweise des DADOS geschuldet, dass ich nur kurz nach Erwerb des Spektrografen meine ersten Erfolgserlebnisse haben durfte.
Der DADOS ist ein kompaktes und robustes Gerät, wie geschaffen für einen Amateur-Astronomen wie mich.
Durch seine Stabilität hat man immer ein gutes Gefühl, dass die Kombination von Okularauszug, DADOS und CCD-Kamera eine wackelfreie Einheit bildet. Die Fokussierung und das Platzieren des Objekts auf den Spalt fallen leicht.
Meine anfänglichen Bedenken, dass die Lichtsammelleistung meines 5 Zoll Refraktor zu knapp für die Spektroskopie seien, wurden zerstreut. So benötige ich mit dem 200er Gitter beispielsweise für Sirius Belichtungszeiten von 1 Sekunde, bei Alnitak 4 Sekunden.
Für mich hat der DADOS eine Tür in die wunderbare Welt der Sternspektroskopie geöffnet, die ich nun nicht mehr missen möchte.
In follow-up to my first question, please tell me the mechanical length of this device, really its optical length in mm from mating surface to mating surface excluding the protruding threads. The charts you mentioned do not provide this information, and I need to determine if there is sufficient backfocus distance on my optic to install it.
I have a hyperstar 9.25 and a QHY 294c. This adapter (Baader UFC S70 / C11/C9.25 Hyperstar, SC, HD Telescope-Adapter), the baader UFC, and the Baader UFC T-2 (m) Camera-Adapter is enough to have good backfocus?
We already published the important data how to find out the right adaption, please see <<Important note on Hyperstar-Adaptation>>
Just substrackt from the 60,4mm back focus length the camera (17,5mm) so you see that you have 42,9mm left for the UFC.
#2459132 is 4,1mm
#2459110 is 13mm
#2459115 is 2mm
These would be the Items you´ll need anyway but still 23,8mm left to bridge with extenders like:
2459141 is 5mm
2459145 set to 18,8mm
Answer by: Baader Web Team (Admin) on Apr 19, 2021 11:10:00 AM
I have Celestron Evolution 8 EdgeHD scope with a 2" SCT thread on the rear cell. I am struggling to find the correct model diagonal for that rig, can you please provide additional information? I read the primer helpfully provided, but there are two options that are both recommended, the SCT-Clicklock visual back + the clicklock diagonal CLDIAG-2, and the same diagonal but this time mounted somehow flush on rear cell. Which is actually better? The eyepiece I was most is my Mark IV 8-24mm Zoom w/Barlow combo, if that matters.
The ideal backfocus of the Edge HD 8 telescope is 133,35mm behind the 2" thread on the rear end. The closer you come with the eyepiece field stop to this point, the better is the star image on the edges of the field. The mirror has 112m optical length. The ClickLock 2" clamp for the rear end of the telescope has 47mm optical length. Means either way works similar good, you are always a little more tahn 20mm from the ideal focus point, wich is not an issue for visual observation with this telescope, especially not when observing with high magnification. When attaching a camera, you will need to take care that you are exactly in the right distance with the CCD sensor, as described in the manual of the telescope.
Answer by: Baader Web Team (Admin) on Apr 13, 2021 9:15:00 AM