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...
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...
From: "compliance122000" <compliance122000@...> ... I noticed that too. I've never used a center-spotted secondary, but I believe the center spot of the...
... 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...
From: "Gene Baraff" <g2baraff@...> ... That makes sense, Gene. When looking at the various components of the XX12, it appeared that the center spot was...
... Dave Kriege of Obsession Telescope fame recommends center spotting the secondary mirror in his book The Dobsonian Telescope. It makes centering the...
... 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)...
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...
... 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...
... 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...
... 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...
... 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...
... 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...
... 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....
... 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...
... 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...
... upper ... the ... The manual for my original Lasermate collimator cites the same reason for center marking the secondary mirror. In fact, the collimator...
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...
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...
... 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...
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 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...
... 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...
