In the new Febr 2009 sky and Telescope on page 83 is a good article about telescope bearings by Gary Seronic Peter ... rides ... has ... movement ... since ......
Due to my very own economic downturn, (unemployed 8 months)I need to sell my 25" dob. It is one of the original Osession 25" f/4.5 'scopes. Not much to say,...
Willie, Last I checked, a new 24" mirror alone cost about $7500; with the scarcity of Pyrex, getting a new large mirror might be close to impossible in...
Hello everyone: I am in the process of buying a Dobsonian and wanted to ask your opinions on what are my options for color video imaging. I hear some utilize...
Budget would be nice to know, as some options are much more expensive than others. The frame storage or integrating cameras are real marvels, and most are more...
Anyone know why Pyrex is scarce? As I see it in the stores in the Kitchen area it does not seem to be scarce. Corning ware is nothing but. I would prefer...
Still have to wait for the mirror/scope to cool down for the best views, even with Zerodur. Dave ... From: william rowland To: bigdob@yahoogroups.com Sent:...
If you are interested in viewing live in color, check out the MallinCam Video Observational System: http://mallincam.tripod.com/index.html Jack Huerkamp ... ...
... From previous discussions, kitchenware Pyrex is nothing like mirror pyrex. Not in principle difficult to make, but it has to be in thicknesses and sizes...
The reason Pyrex sheet glass for telescope mirrors is becoming hard to find is because Corning does not make 4 foot by 8 foot sheets of 2 1/8 Pyrex anymore. I...
I believe Corning sold the name Pyrex and the annealed boro-silicate glass that used to be manufactured by Corning as Pyrex is now manufactured with tempered...
Hey all, Pretty much made up my mind about something I'm doing, but I'd like feedback anyway. I have a 12-inch homebuilt dob. I made it out of stove pipe, and...
Steve, Sky brightness in my garden is, on average, 19.6 mag/ascsec2 (SQM measurements), which I think is badly light polluted, and I still can see the...
... measurements), which I think is badly light polluted, and I still can see the milkyway. Not very well of course, but I can see it. So I think, you must...
OK, that's about the same as my skies. The 19.6 mag/arcsec will give a (zenit) limmag of about 5.5. So on a good transparent night it might be possible for you...
At our observatory, we have about 5.3 skies, and we can see the Milky Way when we have average transparency (per CSC). An easy and quick way to estimate sky...
Wow, 1-2 cm of movement on the laser collimator when you change the altitude of the scope is a big deal, a very big deal. To get good performance, you need to...
Have you considered adding stiffeners to your stove pipe (or maybe it's your connections between the components that needs to be improved)? Clearly the problem...
don't know if it was already mentioned, but someone recently had a question about my bigdob on that user group who had the same problem. what did the trick to...
Is Astro-Sky still in business? <http://astrosky.homestead.com/Astrosky.html> Last year, I sent James Grigar a $500 deposit on a Dob. He is about one month...
Click on your link and you'll see that it's outdated, but that site has a link to the new site, which mentions a sale during the current month. If he recently...
Actually James is in Lake Charles, Louisiana - not New Orleans, and I did see James at the Deep South Regional Stargaze in late October/early November of...
John Huerkamp
jhuerkmp@...
Jan 23, 2009 6:13 pm
19126
I just received an email from James Grigar. I'm relieved to report that he is well. -ad ... I did see James at the Deep South Regional Stargaze in late ...
I'm building a 16" F5 to replace my 14" F4.7. And with the new telescope I've decided to cleanout my eyepiece collection and purchase some new Naglers. My...
Hello everyone? I am considering a Dob structure for a 28" mirror. I would like to choose between a cable sling (stainless steel aircraft cable) system of...
Hi Haryong, It's best to go with the system that ensures contact with the mirror along it's center of gravity, so for the two choices you mentioned the cable...
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.
