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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.
Unfortunately COVID has also caused problems for us. The production of many articles had to be stopped temporarily because supply chains are interrupted again and again at various points. This also affects suppliers of some mechanical parts. We ask for your understanding for this situation and that we are not able to give firm delivery dates at the moment. We would like to assure you that we are working everywhere to solve the supply problems for the components of our products and to bring our delivery capacity back to a normal level.
Answer by: Baader Web Team (Admin) on Mar 8, 2021 10:57:00 AM
I use 1 1/4 eyepieces on a SOlar wedge. For nighttime observing, I use a T2 Zeiss prism diagonal with a 2" nosepiece (which sits in a 2" focuser). I already have a 1 1/4 " polarising filter which fits onto my eyepieces. Can I combine this with a 2" polarising filter, to be put before the prism, and use the combination as a variable polariser for lunar observation (i.e. one polarising filter before the prism and a second one after the prism, and conveniently rotating the eyepiece to get the desired dimming)? This would be very practical, if it works, but will this setup be less good than a dedicated 1 1/4 inch variable polariser?