Helix Manufacturing (authorized University Optics dealer) is having an overstock sale on 5,6,7 and 9mm orthos. 10% on the 5,6,9mm and 15% on the 7mm. I have no...
I just found this group a few minutes ago or I would have answered sooner. I am a huge fan of Orion telescopes. I own three of them. The first one I bought...
... <meinja@i...> ... making ... comfortable ... Hello everyone, I only just subscribed to this forum, so I think I should introduce myself. My name's Carlos...
Hi group, Is there anybody out there imaging with a focal reducer that you are happy with? I mean, no field curvature and no significant distortion? I have an...
Currently I am experimenting with a Denkmeier Powersweeper, which is a focal reducer intended for their Binoviewers. It seems to work quite well for my...
I don't have one for you but if your quest fails, I might be able to machine one for you if I knew its mechanical dimensions. And have you tried an Astromart...
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...
Having problems with message search?
Fill out this form to ensure your group is one of the first to be migrated to the new message search system.
