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Messages 40721 - 40750 of 40750   Oldest  |  < Older  |  Newer >  |  Newest
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40721
Edmund optics paper is excellent and affordable, i used the 20 x 30" sheets http://www.edmundoptics.com/onlinecatalog/displayproduct.cfm?productid=1502 It was...
chris brewchorne
oldclaypaws
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Aug 16, 2008
6:55 pm
40722
Is one better than the other?...
hudecjohn
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Aug 17, 2008
6:51 pm
40723
I am very impressed with the design features that have been incorporated into Orion's new truss dobsonian. They have obviously been listening to their...
compliance122000
compliance12...
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Aug 17, 2008
11:32 pm
40724
From: "compliance122000" <compliance122000@...> ... I noticed that too. I've never used a center-spotted secondary, but I believe the center spot of the...
Jack & Lynn Kramer
starward12
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Aug 17, 2008
11:42 pm
40725
... I've never used a scope with a center-spotted secondary, but to my knowledge, it is used only in the very first step of collimation - making sure that the...
Gene Baraff
g2baraff
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Aug 18, 2008
12:43 am
40726
From: "Gene Baraff" <g2baraff@...> ... That makes sense, Gene. When looking at the various components of the XX12, it appeared that the center spot was...
Jack & Lynn Kramer
starward12
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Aug 18, 2008
12:54 am
40727
... Dave Kriege of Obsession Telescope fame recommends center spotting the secondary mirror in his book The Dobsonian Telescope. It makes centering the...
Phil Lefever
kb0nes
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Aug 18, 2008
12:32 pm
40728
... A VERY rough guess as to its size would be between 3 and 6 mm diameter. Why? On my computer screen, the minor axis of the secondary (in perspective)...
Gene Baraff
g2baraff
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Aug 18, 2008
1:02 pm
40729
A question occurred to me about the center-spotted secondary; namely, if the center spot is at the geometric center of the secondary, what is the effect on...
Jack & Lynn Kramer
starward12
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Aug 18, 2008
1:53 pm
40730
... I'm with you 100% on the implications of the question you raised. One would hope that Orion had the foresight to specify to their supplier that the center...
Gene Baraff
g2baraff
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Aug 18, 2008
2:07 pm
40731
... I can't recall ever seeing that in an Orion ad- how long ago was that? John Wunderlin Mineral Point, WI XT10i...
johnwunderlin
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Aug 18, 2008
3:01 pm
40732
... Thanks, Jack!...
johnwunderlin
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Aug 18, 2008
3:08 pm
40733
... I did this for a while with CDC. I don't recall there being a significant delay, but I had some other issues with CDC- namely it was powerful, but I found...
johnwunderlin
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Aug 18, 2008
3:17 pm
40734
... Did you see that Orion is planning on adding one in the future? "A custom case set and light shroud are currently being developed for the XX12, please...
johnwunderlin
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Aug 18, 2008
3:19 pm
40735
... Thanks for your insights, Gene. On second look it appears that the secondary's center mark is actually an oval 'donut'. I presume it is made that way to...
compliance122000
compliance12...
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Aug 18, 2008
4:08 pm
40736
... The situation with respect to viewing an on-axis star and viewing an off-axis one is different. On-axis is easy: there is an ellipse whose minor axis is...
Gene Baraff
g2baraff
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Aug 18, 2008
5:35 pm
40737
... While that make sense - I don't believe Kriege currently ships his Obsessions with center-marked secondaries. At least the ones I've seen didn't have one....
RapidEye
rapideye.geo
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Aug 18, 2008
5:38 pm
40738
... there ... Hello all, My wife Sue and I have Obsessions (12.5"f/5 & 15"f/4.5 about 2 years old)and they do not come with center marking on the secondary...
James& Sue Schultheis
jamesue01
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Aug 18, 2008
8:25 pm
40739
... High magnification is the condition under which the marking (O ring or spot) will have the minimum effect: Your true field of view will be so small that...
Gene Baraff
g2baraff
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Aug 18, 2008
8:31 pm
40740
... upper ... the ... The manual for my original Lasermate collimator cites the same reason for center marking the secondary mirror. In fact, the collimator...
ourobouros2k2
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Aug 19, 2008
12:23 pm
40741
Orion one! ... It was very recent, in just about every Orion XT ad in Sky and Tel or Astronomy. The name of their new 12 inch dob might just as well be, "Meade...
bryandstone
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Aug 19, 2008
2:09 pm
40742
... that? ... Yeah, it was relatively recent, and a direct defensive response to the Meade LightBridge design....
hudecjohn
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Aug 19, 2008
5:25 pm
40743
When I was doing a encoder test the readings I received were: 4C BD 077 90 80 013 according to the manual if the 3rd set of numbers is below 30 the encoder...
Kevin
ki8fb
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Aug 19, 2008
5:56 pm
40744
... Tighten the bolt in the center of the base to move the sensor closer to the encoder disk. I was able to tilt my scope carefully and work on the bolt (with...
johnwunderlin
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Aug 19, 2008
7:10 pm
40745
... of ... I tryed to do that. I was afraid of tighting it too much and making it harder to move. Kevin...
Kevin
ki8fb
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Aug 19, 2008
7:16 pm
40746
Hi all, I am seeking advise re: flocking the inside of my 10" dob. I have read conflicting recommendations regarding installation of the flocked paper...
Mike McAllister
mcallister_mm
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12:41 am
40747
John, Is there a reason why you didn't take the tube off? Gene [Non-text portions of this message have been removed]...
gldowns
gldowns2001
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1:17 am
40748
Mike I flocked the entire tube of my XT12i. I used 3 inch strips, half the legnth of the tube and 3M spray adhesive. The flocking material comes with...
connollym54
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1:22 am
40749
Kevin I put a plastic washer under the sensor screw end. It holds the whole board up even though it is on one end. Mark...
connollym54
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1:31 am
40750
... I know your question was about how to install it, and my comment is somewhat peripheral to that. I'd suggest that you increase the 15" bottom flocking to...
Gene Baraff
g2baraff
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2:24 am
Messages 40721 - 40750 of 40750   Oldest  |  < Older  |  Newer >  |  Newest
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