Roland, you may be thinking of "Improving the Thermal Properties of Newtonian Reflectors" by Bryan Greer. Its a two part article that appeared in S&T May and...
thanks Len, RE the chip, I looked on the ATIK site and they say its the Sony ICX-098BL CCD chip, its the same size and pixel size (5.6 micron) as the colour...
... Well, how about a fan sucking air out, and another fan just "stirring the pot" within the tube, blowing at the mirror? That way no dust is pulled in. Doug...
By George, I think he's got it! I mean, by Doug, uhhh never mind. A fan pulling air out the bottom (so sucking in at the top- if there's a significant amount...
Ahh!... OK... so these two articles you mention are in addition to the January 2002 article by Alan Alder with a very similar title "Thermal Management in...
Hi Rol, Guess I'll add my 2cents worth to this topic. You said that seeing that looked like 7/10 in your 8" SCT would look like 5/10 in your 12.5" newt, I ...
Piz, I greatly appreciate your and all of the opinions/advice posted on these topics, Mike. Tho' I have ok SCT experience, due to much observing and imaging...
Bryan Greer has contributed a fair amount to the discussion on the Big Dobs chat group and there are some very good posts on the issue of sucking, blowing,...
There are two small (40mm?) computer fans blowing air into the bottom side of the tube across the face of the mirror towards a series of 5 25mm holes spaced...
Very useful info on these Yahoo groups, Tim. Much heated discussion on the topic of cooling fans? An actual Dob Fans group? Wow... guess this is a BIG topic. ...
Rick, The Starfinder 12.5" dob has a full 2" pyrex mirror, so cooldown is likely to take that much longer. The cool.exe program requires the fan fps rating, I...
No idea, sorry. I can take a look at the fans when I get back to Ottawa on the weekend. My 12.5" also has a full thickness mirror that will require some...
Paul Weffers-Bettink came over the other night to test his MX5C camera on my system. He'd been experiencing that fun learning curve, and wanted to narrow the...
Hi Dave, System = as follows: Imaging done from small b.y. observatory: "Photon's End". Celestron DX SCT8 with the heavier mount and PEC. Starlight Express...
Hello Dave I have the same type of a camera that Rol has - a Starlight Express MX5C. Rol's telescope is a fork-mounted Celestron C8 (same as what I have), and...
Hi, Now that I've bought the Astronomik OIII filter I no longer have a use for the Lumicon which is about a year 1/2 old. Kendrick sells it new for $279 Can is...
Paul and Roland, Way to go! Those are fanastic first images....but then again I'm sure that the luxury of Photon's End and having Roland at the helm ensured...
Hi Albert, I believe the horizon is not bad from their parking lot. Also, as an alternative, if you go far into their front lawn, then their building would...
Here is an image of Venus I took this afternoon: http://www.cyberus.ca/~ec088060/images/ven2.jpg It was fairly easy to find in the daytime using setting...
... Thanks, Roland For anyone else who wishes to be at the museum, we are asked to be there around 5:30 am, (although earlier is permissible) and to park in...
Rolf; That is an impressive image. Very sharp! Because the cres is >180deg, must be sunlight coming through the atmosphere/clouds. Lets hope only Venus is...
Hello Rolf. Thanks for posting that interesting image of Venus. I had not seen many amateur images such as that one before, so close to the sun. Enjoyed it, ...
Hi John, I am planning to attend, probably at the Museum. I will be bringing my scope. For those of you who are wondering "where has Bruce BEEN!" - two things...
