I've found the recent thread on mirror cell pads informative, but it got me wondering about the size of the pads, and whether PLOP makes any assumptions about...
PLOP assumes just points, without any area. Jan http://home.wanadoo.nl/jhm.vangastel/Astronomy/ ... From: Christopher Todd To: bigdob@yahoogroups.com Sent:...
Chris wrote I've found the recent thread on mirror cell pads informative, but it got me wondering about the size of the pads, and whether PLOP makes any ...
Nils and Jan, Thanks for the information. Would it be reasonable, then, to suppose that perhaps the best mirror contact would be a steel ball bearing (or ...
I seem to remember that Tom Kratci looked into this (among many other ATM topics) and his conclusion was that a point support gave more distortion than a...
Roger, Thanks for the tip. I am not surprised that someone else has asked almost this exact question before (a philosophy professor friend of mine often says ...
THere is an excellent thread ongoing on cloudynights.com- on DIY setting circles -for those who may not have been following the tthread it has really...
It looks like his results suggest (at least for his mirror/cell set-up)that there is very little difference between a larger pad and a point, and virtually no...
I think the issue of pad diameter also favors felt. If given a good start - with precise "seating" against the mirror back, felt is more likely to slightly...
Not sure how well this would work on grass, but if your just moving it on concrete, it's a great idea. I use these for my various saws, etc. except the ones I...
http://www.lpod.org/archive/archive/2004/01/LPOD-2004-01-24.htm http://www.geekjoy.com/yearreps/apr-01-reports.html#4 "Making the Most Out of What You Got" ...
... Our 28" SM uses plastic pads- I'd guess nylon but I never really thought about it before. From memory, I'd say they're about 1.5" - 2" diameter. -John ...
I've had several off-list questions about which values to use in the middle panel of the application that defines the heat exchange properties on the back and...
I see that Night Sky scopes say that they center their edge support whiffletree at 30° from vertical. Contact is at 15° and 45° . Each contact point...
David, That's a good question. The text on the Night Sky web site is just one of the numerous examples of the lack of knowledge that has plagued this issue for...
I finally had some time to make a simulation of a star affected by seeing, in which I use the "Taylor" hypotesis. Namely I compute wavefront and then I slide...
Mauro, ... The simulation looks realistic. I'm pleased to see that the Airy disk jumps around, so you are getting some good variation in tilt. It was a good...
Hi steve, nice to read you again. I have some concerns about the statistical properties fo the wavefront generated by Suiter's algorithm. The seem to have some...
Mauro, ... I would like to see your evidence for the periodicity. Are you sure it's not a display artifact when the map is resampled to fit the screen pixels?...
... wow... it is exactly what I hoped. In the meanwhie I did another movie (for large amount of turbulence). I will post it. The artifacts in Suiter's model do...
I have done a si mulation for very bad seeing (D/ro>10). An interesting point is that the speckles appear and fade quicker than they move. It looks more like...
"Boiling blob" is exactly how I describe the appearance of a (bright) star in very bad seeing. But the time scale is much faster than your animation- is the...
