Posting Photos Please do take full advantage of the captioning possibilites that exist only in the "Photos" section to add labels and explanatory information...
41624
skyquest-telescopes@y...
Feb 1, 2009 12:47 pm
Forum Rules This message, like the "Welcome Message", is sent automatically to new forum members, as well as being sent out automatically each month. The...
41625
skyquest-telescopes@y...
Feb 1, 2009 12:47 pm
skyquest-telescopes: Welcome and Introduction Page Revised October 2003 1. Introduction and Background The skyquest-telescopes forum was founded in...
41626
hudecjohn
Feb 2, 2009 11:35 pm
Well guys, i have the OTA flocked, the focuser painted flat black thru and thru, the mirror clips relieved of some pressure, and a tube extension built. I...
41627
hudecjohn
Feb 2, 2009 11:41 pm
... on ... outside ... than a ... better ... f/4.7 ... This is a good post, and right on the money. IMHO it was the Coulter Odyssey and Halley comet...
41628
Jack & Lynn Kramer
starward12
Feb 3, 2009 12:17 am
From: "hudecjohn" <hudecjohn@...> ... About seven years ago I bought a 6" APO and driven equatorial mount for planetary observing. It's a great...
41629
Gene Baraff
g2baraff
Feb 3, 2009 1:03 am
... Light hitting the back of our mirror is not going to affect your view: The aluminum on the face of the mirror will reflect it all out again through the...
41630
johnwunderlin
Feb 3, 2009 4:03 pm
For a very first scope, a GEM is pretty tricky to set up and get used to IMO. I think a Dob is a perfect 1st scope. Depending on where he's keeping it, he...
41631
Carol Lugg
habakkuk2_1
Feb 3, 2009 4:21 pm
John, I have been on the lookout for a hand truck, and I haven't seen one yet for $20.00. Maybe I am missing something? ... Blessings, Carol "There is no pit...
41632
RapidEye
rapideye.geo
Feb 3, 2009 4:30 pm
On Tue, Feb 3, 2009 at 11:21 AM, Carol Lugg ... Needs some paint, but should work: http://cosprings.craigslist.org/for/1017087887.html <RE>...
41633
johnwunderlin
Feb 3, 2009 4:42 pm
... yet for ... I bought mine from our local Farm and Fleet. I don't remember the exact price, but I know it was <$30 anyway. Of course, this was 5+ years...
41634
Jack & Lynn Kramer
starward12
Feb 3, 2009 4:50 pm
From: "johnwunderlin" <johnw@...> ... I've bought a lot of stuff at Farm and Fleet ... some of the best prices in the Midwest. I got my 12V...
41635
hudecjohn
Feb 3, 2009 7:59 pm
... the ... Wow, thanks Gene. But i was under the impression that some sort of flocking had to be done around the primary mirror? Does that mean just the...
41636
Gene Baraff
g2baraff
Feb 3, 2009 11:30 pm
... . ... John, The flocking I was recommending around the primary was for a band 20 or so inches wide - ABOVE the primary. If you look through the eyepiece,...
41637
hudecjohn
Feb 3, 2009 11:35 pm
... 20 ... from ... Oh!!!!! Thank you so much!!! I am not comfortable with the primary air slots being stopped up for possible cooling complications. I have...
41638
James, Dan
dejtitan
Feb 4, 2009 1:11 pm
"I have been on the lookout for a hand truck, and I haven't seen one yet for $20.00. Maybe I am missing something?" Carol, I bought mine for $22.95 with...
41639
J R Hilland
hapkiyukwonsul
Feb 4, 2009 4:44 pm
I spoke with the folks at Starry Night and they said to use Pro or Pro Plus, not Enthusiast. There are issues with Vista but most (not all) have been resolved...
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hudecjohn
Feb 4, 2009 6:20 pm
As you guys know i just followed the flocking instructions provided right here to the letter on my XT10 and last nite i got a chance to try the new and...
41641
hudecjohn
Feb 4, 2009 10:26 pm
hi guys what is the largest size i can stop my XT10 down to as an unobstructed system, and what focal length would it end up being? Thanks in advance!...
41642
rbethman
rbethman1
Feb 4, 2009 10:40 pm
John, I'm confused. The focal length is dictated by the curvature of the primary mirror. What do you mean by "stopping down"? Bob - N0DGN ... -- Bob - NØDGN ...
41643
bryandstone
Feb 4, 2009 10:49 pm
you could stop it down to 85-90 mm and the focal length would still be 1200mm. the f/ ratio would change to about f/14 or so. There is a chapter in Robert...
41644
rbethman
rbethman1
Feb 4, 2009 10:58 pm
Yes - BUT - he stated an "an unobstructed system". The more he "cuts down" the light input path, the more the secondary becomes a LARGER obstruction to the...
41645
hudecjohn
Feb 4, 2009 11:07 pm
... Hi. im sorry, by stopping down i meant blocking some of the incoming light with cardboard or something. And yes i did mean focal ratio, not length. I...
41646
John Boyce
a3dart1
Feb 4, 2009 11:08 pm
The mask is off center, so it is unobstructed, and will give better clarity on planetary objects, especially when the air is turbulent. John ...
41647
rbethman
rbethman1
Feb 4, 2009 11:47 pm
John, I'd NOT put the blocking piece into place UNTIL you have reached thermal equilibrium. Other than that, have a ball! Bob - N0DGN ... -- Bob - NØDGN ...
41648
Jack & Lynn Kramer
starward12
Feb 4, 2009 11:55 pm
From: "John Boyce" <jboyce@...> ... What passes for "better clarity" is improved contrast as a result of not having the light dispersion of the...
41649
hudecjohn
Feb 5, 2009 12:06 am
... better ... turbulent. ... of not ... stopping down ... of the 10" ... the ... diaphragm on ... Thanks Jack, i actually suspected that this may be the case....
41650
John Boyce
a3dart1
Feb 5, 2009 12:30 am
If you come out to the mountains of New Mexico where the air is quite turbulent I think there may be evenings where you might like to use a Hershel mask, on...
41651
Jack & Lynn Kramer
starward12
Feb 5, 2009 12:49 am
From: "John Boyce" <jboyce@...> ... I've been coming to New Mexico on annual observing trips for over twenty years. Yes, the mountains do churn up the...
41652
Gene Baraff
g2baraff
Feb 5, 2009 1:24 am
... I've done the same thing and gottern the same result: The increased aperture is more mportant than losing the diffraction caused by the secondary. Gene...
