... Just for clarification, the discussion was about a 1.1m mirror, and I was talking about ~1-meter and larger mirrors. I was talking about doing your...
20003
Mike Paulus
mikepaulus79
Sep 8, 2011 9:22 am
Hi folks, Well you guessed it. Mike Lockwood is making both the primary and secondary. I'm the "amateur" mentioned in Mike L's response. The truth is that...
20004
Big
bigdob20
Sep 10, 2011 3:24 pm
What is the market like for a coma corrector for very fast big dobs? I am starting to figure a super fast 32" and find that the Televue type 2 Parracorr will...
20005
Mel Bartels
Mel_Bartels
Sep 10, 2011 5:37 pm
... What is the market like for a coma corrector for very fast big dobs? I am starting to figure a super fast 32" and find that the Televue type 2 Parracorr...
20006
gumbydad2002
Sep 11, 2011 11:26 am
My neighbor was over the other night and had a chance to see my 28" Newt although we were using my 18" that night for a neighborhood show-and-tell with some...
20007
John Mahony
jmmahony
Sep 11, 2011 5:28 pm
If I had to guess based just on my local region (Indiana), I'd come up with a considerably lower estimate- maybe 100. But there are obviously other parts of...
20008
Mel Bartels
Mel_Bartels
Sep 11, 2011 5:55 pm
I'd guess 100. The Oregon Star Party is a major center of large dob activity over the years. I count maybe 12-15 *different* 28" and larger scopes (5 scopes of...
20009
pensack1
Sep 12, 2011 4:40 pm
Mel's opinion and mine differ, both in terms of the weight difference with a slightly larger UTA, and with the vignetting significance. While the math works...
20010
atmpob
Sep 12, 2011 7:21 pm
I counted 10 30 and larger at Okie Tex last year. Three were larger than 30. The largest being 33 I think. Almost no one from the west coast was there so...
20011
gumbydad2002
Sep 12, 2011 8:30 pm
Dale, I have had two educated guesses. What is your guess as to how many 28" and over dobs are in the USA? Bob...
20012
Neil
lowentress
Sep 12, 2011 11:17 pm
Hi, I'm writing from the U.K. where large Dobs are really thin on the ground, and astro-imaging with small instuments seems to be the main aim of many,...
20013
Mel Bartels
Mel_Bartels
Sep 13, 2011 1:18 am
Don, I always enjoy debating telescope design with you. Keep in mind though that I spent a half year designing the scope and a year and a half using it so I am...
20014
Neal Galt
nealgalt
Sep 13, 2011 2:31 am
Just in Sierra Vista, Az I know of 4 X 30" and larger with a 40" under construction by someone. population 50k. Neal [Non-text portions of this message have...
20015
mharveyww1
Sep 13, 2011 3:48 am
At Chiefland (Florida) Astronomy Village alone there are 36" and 42" Dobs. Plus at least one frequent weekend visitor often brings his 30". Mike...
20016
Michael
mharveyww1
Sep 13, 2011 3:50 am
Oooops...hit the 'send' button too soon. Wanted to add that my 28" is there every new moon weekend and it is often joined by at least one other 28. Mike...
20017
john
m51john
Sep 13, 2011 5:14 am
I live in San Diego and the astronomy club I belong to has over 500 members. My friend has a 24" and I only know of one other person with a 25". That is it,...
20018
gumbydad2002
Sep 13, 2011 10:52 am
John, A friend of mine surmised that there may be less than 100 in the USA when you use the criteria of >28". He thought the number might well be about 80? We...
20019
Alex
va3ttt
Sep 13, 2011 4:13 pm
I have SW Dobsonian 8" like that one http://www.canadiantelescopes.com/Shop-By-Brand/Dobsonians_3/Sky-Watcher-Traditional-8-Dobsonian It is a good guy but I...
20020
George Andrew
geodandrew
Sep 13, 2011 7:18 pm
Go BIG or go home is my matto. Aperture rules. George From: Alex <va3ttt@...> To: "bigdob@yahoogroups.com" <bigdob@yahoogroups.com> Sent: Tuesday,...
20021
Kevin Ackert
mackev1
Sep 13, 2011 10:53 pm
I have a 36 inch. Kevin Ackert From: gumbydad2002 <wsrs@...> Reply-To: <bigdob@yahoogroups.com> Date: Tue, 13 Sep 2011 10:52:26 -0000 To:...
20022
Robert
citycreek
Sep 13, 2011 11:28 pm
I keep a 30" in Utah desert....
20023
John Mahony
jmmahony
Sep 14, 2011 7:35 am
... Yes, that much is rather obvious. ... No, the vignetting "as viewed at the secondary" happens on opposite sides of the secondary. The effects do not...
20024
Jan van Gastel
janvangastel
Sep 14, 2011 8:03 am
For planets, the only requirement (for the secondary size) is that the secondary is large enough to have a minimal 100% illumninated field. A one millimeter...
20025
chonton
Sep 15, 2011 7:33 pm
Hi! I joined the group as i ordered an Obssession telescope, 18" UC. It is coming with a Televue paracorr, Argo Navis and Servo Cat. Included are also a...
20026
Shane LaPierre
ctastronomer
Sep 15, 2011 7:34 pm
Dark skies :) ... [Non-text portions of this message have been removed]...
20027
Roger Greenwood
astrocrumb
Sep 16, 2011 4:14 am
David: The 21mm Ethos is "da bomb" Pricey, but the ultimate EP(IMO), seriously! Dew heaters for the EP's. Connectivity for your laptop or other electronics....
20028
chonton
Sep 19, 2011 8:16 pm
Thanks, but i was thinking in other kinds of accessories. I already own good eyepieces and a binoviewer. David....
20029
andyrud3
Sep 22, 2011 7:40 pm
Hi Everyone, I am in the process of having my mirror re-figured and re-coated. I was wondering how long should I expect a coating to last and how does a...
20030
Allen Davis
epc398
Sep 22, 2011 8:20 pm
Mine lasted 6 years or so here in humid eastern NC. John Hudek of Galaxy said that was about normal for this climate. I noticed that my whole mirror was...
20031
The Great White Land ...
johnndenver2001
Sep 22, 2011 10:10 pm
They last much better out in the Desert Southwest. Thank goodness. 6 Years is not very long, especially on a larger mirror / not a dob which it is a real...
