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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.
What specific camera adapter and spacers do I need to achieve the proper 55mm of back focus for photographic purposes between the MPCC Mark III and my Nikon Z7 mirrorless?
The Nikon Z-cameras have got a back focus of 16mm.
The Wide T-ring need 8,3mm, no matter if you use it with T-2 or with the additional S52 / M48 adapter #2958552
The MPCC requires 55+/-1mm distance, when used with T-2 or the optional Baader M48 Spacer Ring for MPCC III / Protective EOS T-Ring
# 2458405, or 57,5+/-1mm when used with the M48-thread, but without the adapter #2458405
If you use either T-2 or M48 with the adapter #2458405, you need an additional 30.7mm-extension (+/-1mm) in T-2 or M48.
For T-2-this can be done e.g. with
2x Baader T-2 / 15 mm Extension Tube (T-2 part #25A) # 1508154
1x Set: T-2 Fine-Adjustment rings (0,3 / 0,5 / 1 mm) - Aluminium # 2457910
or
1x Baader VariLock 46, lockable T-2 ExtensionTube 29-46mm with spanner tool (T-2 part #25V) # 2956946
For M48, we do not have the spacer rings yet, but you could use
2x M48 Fine-Adjustment ring 1mm (gold) - Aluminium #2457918
1x Baader Hyperion Finetuning-Ring, 28 mm # 2958228
If you use the MPCC without the optional adapter #2458405, you need a 33.2+/-1mm-extension - for this, we do not have a solution at the moment.
For a fullframe camera, we'd recommend the M48-adaptation because of its larger clear aperture.
Answer by: Baader Web Team (Admin) on Jan 20, 2021 10:09:00 AM
Do you supply the MPCC Mk 111 without the recess in the barrel?
This causes difficulties when used with clamps with a copper ring.
No problems with a smooth barrel.
Of course you can use the Hyperion eyepieces with the telescope, but will show the coma which is typical for such a fast telescope (just like a camera would di, too). To get rid of the coma, we recommend combining your eyepieces with the 2" MPCC V-1 Mark III Newton Coma Correktor - SET: Visual and Photographic Version # 2458403 which can easily be combined with many eyepieces. This coma corrector neither changes the focal length nor the field of view.
Please note that the 36mm eyepiece will result in an exit pupil of 8mm with your telescope, which is probably too much for your eyes (typically, the human pupil doesn't open much farther than 7mm even for young people and under darkest skies). The 31mm eyepiece should be more useful with an exit pupil of ca. 6.9mm.
Answer by: Baader Web Team (Admin) on Jan 18, 2021 9:39:00 AM
guys this stuff is far to complicated to use. I need "YOU" to put together a usable package i can use. I have a stellarvue 80mm f6.9 with feathertouch 2in focouser. All i currently have is your Hyperion Mark IV 8-24mm Zoom Eyepiece, i need a borlow, and a prism diagonal and any other items to assemble everything together, i prefer to keep it as simple as possible. thanks for your help
This prism is made especially for the old Maxbright bino-viewer, it is meant to be attached directly to the T-thread of the bino-viewer, mainly for terrestrial observations.
If you do not use a binoviewer, we'd recommend either a mirror diagonal like
Baader 2" BBHS ® Mirror Diagonal with 2" ClickLock Clamp # 2456115
Baader 2" ClickLock Diagonal Mirror # 2956100
Baader Zenith Prism Diagonal T-2/90 ° with 32mm Prism (T-2 part #14) # 2456005K (for binoviewers or if you only use 1.25" eyepieces)
for astronomical observations or one of these amicis for terrestrial observations:
Baader 2" Amici-erecting-prism 90° with 2" holder and 2" sleeve # 2956152 (also for high magnifications)
Baader1¼" Amici-erecting-prism 45° with 24mm free aperture # 2956150 (only for terrestrial observations, only 1.25")