Hi, I own an Obsession 22UC and I wonder what is the widest FOV I can expect with it without any obstruction, vignetage... Right now, I am using a Nagler 5...
20088
Roger Greenwood
astrocrumb
Jan 17, 2012 3:35 pm
I found the 31mm nagler and the 21mm Ethos have about the same FOV, but the Ethos has more of the "space walk" feeling with the higher Mag. I couldn't get used...
20089
Nils Olof Carlin
nilsolofcarlin
Jan 17, 2012 3:51 pm
The limiting factors are focal length of mirror, and field stop diameter of the EP used. And of course if you use a Paracorr or other coma corrector. Of the...
20090
Stephan
stecaro2002
Jan 18, 2012 1:00 am
Thank you both for your informations and advices. I will stay with my actual eyepiece set (Nagler 31, Ethos 21, 13 and 8)....
Is there anything worth watching in the video underneath the story or is it unrelated? All it says is I'm blocked because of my location (Australia). Darren ...
20093
Craig Breckenridge
craig_brecke...
Jan 20, 2012 3:10 am
Actually, China is one of the several partners on the project. India and China are joining the Canadians and Americans on the project. I am directly involved...
20094
howieglatter
Jan 20, 2012 3:22 am
... Let me know when you are ready to collimate it :- )...
20095
Craig Breckenridge
craig_brecke...
Jan 20, 2012 3:37 am
That's a task and a half Howie... The Primary mirror supports are active and the secondary is deformable. The whole system is designed to be adaptive. Craig...
20096
John Mahony
jmmahony
Jan 22, 2012 1:39 pm
... 2"=50.8mm. Allowing for thickness of the barrel wall, it's still possible. Televue 55mm Plossl and 41 Pan both have a field stop of 46mm. ... At f/4.2...
20097
Nils Olof Carlin
nilsolofcarlin
Jan 22, 2012 3:22 pm
John, I wrote ... with 42 mm and without paracorr a 1.02 deg FOV, with it 0.89 deg. I don't ... field stops.>>> ... possible. Televue 55mm Plossl and 41 Pan...
20098
zoran
astrozor
Jan 27, 2012 11:05 pm
Hi Wayne, Bob, Alan and Roger Thanks for your useful advice. Yes, all of you are right, the cooling should not be forgotten, here in Ontario also the...
20099
Stephan
stecaro2002
Feb 2, 2012 2:28 pm
Hi everybody, I would like to do some prime focus photography of the moon with my 22UC and my Canon EOS550D (Rebel T2i). Unfortunately, I cannot get a focused...
20100
abellhunter
Feb 2, 2012 6:37 pm
Astro Heads, One August night, high in the Andes; Simon, Bernard, and i bagged 101 Globular Clusters in a dusk to dawn Globular Cluster Marathon! i think...
20101
Les Dalrymple
ngcles
Feb 3, 2012 4:13 am
Hi Abellhunter, Tom & All, Hate to disappoint you Abellhunter but you're not even close. See Observer's Notebook, p 116 of the August 2000 issue of Sky &...
20102
abellhunter
Feb 3, 2012 7:43 am
Congrat's Mate! i had a hunch that an Ozy had the record. i'll get out there this spring w/a new team and see what we can get. Cheers! Abellhunter ...
20103
Fabio
fabio_falchi
Feb 15, 2012 7:52 am
Dear all, have some of you an idea of how many amateur astronomers are out there? For example S&T have about 80000 copies (if I remember well), but of course...
20104
abellhunter
Feb 16, 2012 9:03 pm
Bigdob group, here is a sample list of 30 of the worlds largest privately owned amateur telescopes found on the web. Abellhunter ... ...
20105
dobson 2005
pierredesvaux
Feb 16, 2012 9:26 pm
A very interesting list! If you look at this page, and scroll down, you will see some of the largest dobs in France: ...
20106
C. Starks
cstarsnc
Feb 16, 2012 10:21 pm
The guys in France have been doing some interesting, unique, and elegant Dob designs for a long time. Very clever, those guys. Charlie From:...
20107
Shane LaPierre
ctastronomer
Feb 16, 2012 10:34 pm
One of the more inspiring posts in years to me. I want a big 36" blank now!!! Shane Sent from my iPhone ... [Non-text portions of this message have been...
20108
Neal Galt
nealgalt
Feb 17, 2012 3:06 am
Welll....not quite.....there's mine....High Knoll Observatory with a 36" Starsplitter....the only one ever built to that size. Neal ... From: abellhunter To:...
20109
garyk9rx
Feb 17, 2012 3:13 pm
and my 30" StarSplitter 400' away from Neals - probably the closest total aperture owned by amateurs in the world. Gary Myers StellarCAT...
20110
Paul Alsing
pnalsing@...
Feb 17, 2012 3:54 pm
Then there is this guy... http://group70.org/ ... if they ever get it finished. \Paul A ... From: bigdob@yahoogroups.com [mailto:bigdob@yahoogroups.com] On...
20111
Robert Bunge
bungerob
Feb 17, 2012 4:10 pm
And there is: http://www.wro.org/ which is going from a 31-inch to 36-inch this summer, or so is planned. WRO isn't a dob, the subject was large amateur...
20112
Arnie Stodolsky
sandybeachca
Feb 17, 2012 5:07 pm
There was a 42" CDK shown at RTMC in 2010, built by a group at El Camino College, Ca. Arnie Stodolsky astodols@......
20113
abellhunter
Feb 17, 2012 6:03 pm
Great list from France! Thanx for the link! this is just the kinda stuff i was looking for...... A....
20114
abellhunter
Feb 17, 2012 6:17 pm
Howdy Gary, looks like T.C & i are going to be top'n your guy's 66" total. we'r hope'n to getter-done by the end of the year. T.C 42" A.H 28" ___________ Total...
20115
John Mahony
jmmahony
Feb 17, 2012 7:21 pm
Several years ago there was a group in my state planning a new public observatory. They started with a very large initial donation and bought 2 36" scopes...
20116
C. Starks
cstarsnc
Feb 17, 2012 8:48 pm
‘Bout time for some interferometry between you and Neals, eh? Charlie Starks Markless Astronomics From: bigdob@yahoogroups.com [mailto:bigdob@yahoogroups.com]...
