Hello Group Well it has been a busy summer of work so I had to reactivate my membership so I hope all this works. When I was observing the other night with my...
Coming and going sounds like upper atmospheric turbulence. Were the stars twinkling when you looked them with the naked eye? "My advice is free and worth...
Hi group, I noticed while collimating my scope that occasionally, not all the time, there is a very slight flattening of only the outermost diffraction ring on...
I think your idea of enchroachment is good. Doesn't sound like a mirror figure problem, if it only is seen in the outer ring. Could your eyepiece tube be ...
Could it be the bottom of your focuser protruding into the mirror path? That would mean that according to the back focus of each of your eyepieces, sometimes...
Definitely not the focuser. Perhaps thermal. I do have the scope in a dome and perhaps it takes longer for stabilization than I realize. I open the dome a few...
Hi, Try checking if the pattern is similar to one of the following found at this website: http://www.willbell.com/tm/tm5.htm It may be a sign of spherical...
The focuser does not appear to enter the OTA. I also adjusted my primary as you did so I could more easily reach focus with ccd cameras. Dave ... <image.tiff>...
That's a great reference. Thanks. Fortunately it doesn't appear to be that. Dave On Monday, September 27, 2004, at 06:17 PM, Andre Luiz R Moutinho ... ...
... to ... If it's a thermal plume it should eventually go away or shift. Is the secondary large enough or properly positioned? Sometimes they'll cut off a bit...
Thanks for the reply. I believe the actual collimation component of the test was perfectly fine. I'm thinking either thermal or encroachment. I will keep...
... You can usually verify a thermal effect by placing your hand (or some other obstruction) in front of the telescope, encroaching from the top side of the...
Hello to the group, I've just aquired a 13.1" f4.58 Dob. I am a physicist by education and an engineer by trade. I have been into astronomy for many years but...
Welcome to the group! It has been my opinion that lasers are nice for that final tweak after having collimated with your normal tools. They seem especially...
If you already have your system very close to properly collimated, the laser with the cut out...so your can see the return target from the primary end of the...
Welcome to the group. I'm also a physicist by training, and a nerdy engineer by trade. We both turned to the dark side, I guess. With that fast scope, a...
... I have a bit of experience with Tectron's tools and laser collimators. Since you have a Cheshire already, you don't need a Barlowed laser. The Cheshire's...
Amen Vic, But for the more anal retentive among us, the Barlowed laser does make for a "quick and dirty" tool for checking and touching up the primary...
... I have both of Jim Fly's new tools as well. The Infinity II is an excellent autocollimator, plenty bright to track the focal plane and inverted images, and...
Hi. I'm new to the group. I have been doing binocular Astronomy for about 10 months. I recently acquired a used 4" 680mm f.l. Wm.-Yang Megrez SD Refractor...
Hello People My name is Rob and I'm a newbie to this group and fairly new to astronomy. I live in northern NSW, Australia. which currently places Neptune & ...
That will be quite an assortment. I'm interested in the off-axis Newtonian. Where are you getting that from? Are you getting it for planetary/lunar ...
My guess is you've passed right over them without realizing it. I haven't looked for them, but had the same problem looking for the Ring Nebula with my 6" ...
Hi. The off-axis was to be my first telesope. The idea was to get a newtonian with Refractor quality at Newtonian prices. With a focal length of 1020 mm it...
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