Scheduled Maintenance:
We are undertaking some essential, but extensive maintenance to improve Yahoo!
Calendar. Your Group Calendar is being migrated to a much improved version of
Yahoo! Calendar. During the maintenance period, you may not have access to your
Groups Calendar.
We sincerely apologize for this inconvenience. Your Groups Calendar is in great
shape and we are working to have it available again as quickly as possible
- Yahoo! Groups & Yahoo! Calendar Team
Hi Mike (and All), A major move! How far is your new place from Urbana? Great on your large new f/3 mirrors. Very nice! I've corresponded a bit with Al on...
Hi Dave, Tong, and All, Many thanks for your suggestions. Sounds like a 2.7 or 3.0 inch focuser is the way to go for the 1 m telescope. Place the two 50...
About two years ago, Rob Willett, London created the best program I have ever seen for printing setting circles. It had more flexibility than anything I've...
Yes! It doesn't work. One buddy in Ohio has complete contact info but said Rob's site is down and that his girl friends site is also down too. I wrote to his...
Hi David, This is an interesting idea and question. And I suppose if one was making fairly fast paced recordings, one would get a trace of the background and...
Hi Craig, Great input. Much appreciated. So for at least some of your telescopes there might be what we might consider "reverse tech transfer" from lighter...
Hi Tong, Many thanks. I reduced your spread sheet down to just focusers 2.7 inches or larger for the 1 meter portable photometric telescope. Attached. It ...
Hi Russ, I'll keep everyone posted on the 1m progress; I just sent an email to Dave earlier tonight regarding some optical specifics... I guess I should have...
Hi Tong (and Dave and All), Thanks again, Tong, for the spherical aberration corrector design for the 1 meter f/4 photometric telescope. It should reduce the...
Alt-Az Initiative Workshops for 2010 Five (and perhaps six) Alt-Az Initiative related workshops are scheduled for 2010 that will include discussions of...
Hi Russ, Hi Tong and All, Attached is the updated Spot-size/Off Axis chart with extended off-axis distance. Thanks ever so much! This answers a really vital...
Dr. Robert Argyle Institute for Astronomy University of Cambridge Dear Bob, For a number of years I have taught, along with several helpful supporters, a one...
Russ, This is a great rundown of the year. Thanks. I talked the wife into a hop to Oregon so I could attend the Portland workshop at Dan’s place. She is...
Russ, Hi Drew (and David), I got some updates on the Earthstone foams. I did a lot of testing this past two weeks and some of the stuff I was thinking was...
Hi Howard B, Richard, Mel, and Dan (and Howard K and All), I made initial contact a few weeks ago with Howard Knytych with respect to doing something at the...
Hi Andrew, Great on your February Florida workshop. I was glad to promote it and include it in the description of the year's workshops. I revised the ...
Hi All, Two reports on Earthstone (Starstone) mirrors are attached. One is from David and the other from Andrew. I'll bug David and Andrew for some pictures...
Russ, I have to sadly report that the 60” mirror project will not be on the grinding machine. Dave Davis is sending me a 22” instead. So for thems that...
Hey gang, Thought to send along an update. The is the first mirrorgram of a 9” F/5 ( ROC = 90” ) fused foamglass mirror that Dave and I have been working...
Hi All, There was, a while back, a small flood of emails as the question of autoguiding alt-az telescopes (with and without instrument rotators) was explored....
Russ, Hi Drew, I have to sadly report that the 60” mirror project will not be on the grinding machine. Dave Davis is sending me a 22” instead. So for...
Hi Russ, Hi Howard, I’m fascinated that Orion will be producing these huge Newtonians but think they’re behind the curve in making them so long. They...
Hi Craig, How is your 12 point lateral support arranged? Is it in some sort of Wiffletree of sorts, or ...? Sounds interesting. Cheers, Russ I use a 12...
Dear Alt-Az Initiativers, Attached is a near final draft of a chapter, "Figures of Merit for Light Bucket Mirrors," written by Bruce Holenstein and two of...
Hi Mel, Many thanks for your input (below). Any references on sharpness? Comparing aberrted versus corrected apertures would certainly make sense. In my 1...
Hi Rainer, Thanks very much for your suggestions, below. So your approach would be, perhaps, to alternate between several long exposures to obtain star trails...
Scheduled Maintenance:
We are undertaking some essential, but extensive maintenance to improve Yahoo!
Calendar. Your Group Calendar is being migrated to a much improved version of
Yahoo! Calendar. During the maintenance period, you may not have access to your
Groups Calendar.
We sincerely apologize for this inconvenience. Your Groups Calendar is in great
shape and we are working to have it available again as quickly as possible
- Yahoo! Groups & Yahoo! Calendar Team
